Inflation Calculator
See what inflation really does to your money. Find out how much $100 today will be worth in 10 years — or how much you would need in the future to match today’s dollars.
Future cost
At 3% annual inflation, $10,000 of today’s spending power will cost $13,439.16 in 10 years.
- At 3% annual inflation, $10,000 of today’s spending power will cost $13,439.16 in 10 years — $3,439.16 of erosion, keeping 74.4% of its purchasing power.
- At 3% a year, prices double roughly every 24 years (the rule of 72: 72 / 3 = 24) — a $10,000 expense today becomes about $20,000 in 24 years and roughly $40,000 in 48 years.
- On real BLS CPI data, $100 in 2000 has the buying power of $186.96 in 2025 — cumulative inflation of +87.0%, an average of 2.53% a year.
Year-by-year value erosion
I built the table below as an inflation calculator by year: enter an amount and a rate, and it shows your money’s future cost — and its surviving buying power — for every single year of the span, not just the endpoint. It doubles as a buying power calculator and a plain inflation adjuster, and it is an inflation calculator USD readers can run in both directions: forward at an assumed rate here, or backward through the official CPI-U record in the Historical tab above. I show every year separately on purpose — inflation damage is a path, not a headline, and the year-by-year path is what a retirement plan or a savings goal actually lives through.
| Year | Value | Eroded so far |
|---|
The complete guide to inflation
Everything about how inflation erodes money — the math, the history, and how to plan around it.
📌 Current & recent US inflation rates
If you came looking for the current US inflation rate, here it is with its working shown: the US inflation rate current as of the latest published annual average — 2025 — is 2.63% (CPI-U 321.943, up from 313.689 in 2024). That is the annual-average basis this calculator uses, from the same CPI-U series, 1913–2026, that powers the Historical tab above.
2025: 2.63% · 2024: 2.95% · 2023: 4.12% · 2022: 8.00% · 2021: 4.70% · 2020: 1.23%
I recompute every rate above from the CPI-U annual averages on this page (rate = CPIyear ÷ CPIprior year − 1), so you can audit each one against the table in the Historical tab. News headlines usually quote the latest month’s 12-month change instead — the same index, sliced differently — which is why the figure you saw this morning may differ slightly. Source: U.S. Bureau of Labor Statistics, CPI-U annual averages.
📉 What inflation does to your money
Inflation is the gradual rise in prices that shrinks what each dollar buys. At 3% annual inflation, $10,000 of today’s spending power costs $13,439.16 in 10 years (10,000 × 1.0310), and $10,000 in 10 years buys what $7,441 buys today (10,000 ÷ 1.0310). The erosion compounds: you lose 2.9% of purchasing power in year one but the losses accelerate as the base shrinks.
The two directions matter for different questions. Future cost (multiplying by 1.03n) answers “what will my expenses become?” — essential for retirement planning. Today’s value (dividing by 1.03n) answers “what is that future sum really worth?” — essential for evaluating pensions, settlements, or lottery payouts. The calculator above does both.
Deflation — negative inflation — reverses the math: prices fall and money gains purchasing power. Japan experienced mild deflation in the 2000s; the US saw brief deflation in 2009 (−0.4%) and 2015 (−0.1%). The Historical CPI tab handles these automatically since it uses actual index values.
Watch for shrinkflation — inflation’s sneaky cousin. When a cereal box drops from 500g to 400g at the same price, that’s a 25% price increase per gram that never shows up on the price tag (though it does show in CPI, which tracks unit prices). Skimpflation (cheaper ingredients, same price) works the same way. The sticker price is only half the story — always compare price per unit.
Why does inflation persist? The wage-price spiral: workers demand higher wages to afford rising prices, businesses raise prices to cover higher wages, repeat. Central banks fight this by raising interest rates, which cools spending — the standard playbook Volcker used in 1980–82, when the Fed funds rate hit 20% to break double-digit inflation.
🧮 The math: compounding in reverse
Inflation compounds exactly like investment growth, working against you: Future cost = Amount × (1 + i)n and Today’s value = Amount ÷ (1 + i)n, where i is the annual rate and n is years. Worked example: $100 at 3% for 10 years → 100 × 1.0310 = 100 × 1.343916 = $134.39. Reverse: 100 ÷ 1.343916 = $74.41.
The Rule of 72 gives quick estimates: divide 72 by the rate to get doubling time. At 3%, prices double every 24 years (72 ÷ 3). At 8% — the 2022 US rate — prices double every 9 years. For halving purchasing power, same math: at 3%, your money’s buying power halves every 24 years.
To convert between nominal and real: real rate ≈ (1 + nominal) ÷ (1 + inflation) − 1. An 8% investment return with 3% inflation is (1.08 ÷ 1.03) − 1 = 4.85% real — not 5%. The simple subtraction (8 − 3 = 5) is a close approximation but the division is exact.
For precise work, economists use continuous compounding: Future = Amount × ert. At 3% for 10 years: 100 × e0.30 = 100 × 1.34986 = $134.99 — barely different from the $134.39 discrete result. The gap only matters at high rates or long horizons, but it’s the form you’ll see in academic papers.
Present value is the same math in reverse and it’s how professionals price everything: a $100,000 lump sum due in 20 years at 3% inflation is worth 100,000 ÷ 1.0320 = 100,000 ÷ 1.80611 = $55,368 today. That single number lets you compare a future payout against cash in hand — use the calculator’s “Today’s value” mode for exactly this.
Rate 10 years 20 years $10,000 → future cost (10yr) 2% ×1.219 ×1.486 $12,190 3% ×1.344 ×1.806 $13,439 5% ×1.629 ×2.653 $16,289 8% ×2.159 ×4.661 $21,589
🏛️ A century of US inflation: what the CPI shows
The Consumer Price Index (CPI-U) tracks a basket of consumer goods since 1913. $100 in 1913 (CPI 9.9) has the buying power of $3,252 in 2025 (CPI 321.943) — prices rose roughly 32-fold in 112 years, averaging about 3.1% annually.
The history has distinct eras. The 1970s stagflation peaked at 13.5% in 1980 — the highest in the series — driven by oil shocks. Paul Volcker’s Federal Reserve crushed it with double-digit interest rates, bringing inflation to 3–4% by the mid-1980s. The Great Moderation (1990s–2019) averaged under 2.5%, with brief deflation in 2009. Then 2021–2022 spiked to 8.0% on pandemic supply shocks — the fastest since 1981.
Try the Historical CPI tab: $1 in 1980 ($82.4 index) equals $3.91 in 2025. $1,000 in 2000 equals $1,870 in 2025. And going backward: $1,000,000 in 2025 buys what $30,751 bought in 1913 — a vivid way to grasp a century of erosion.
Some landmarks worth trying: a 1935 Ford cost about $625 — roughly $14,670 in 2025 dollars (625 × 321.5/13.7). A 1965 Mustang at $2,368 sticker becomes about $24,170 today (2368 × 321.5/31.5). Median US home price in 1980 was ~$47,200, or $184,414 in 2025 dollars — compare that to today’s ~$420,000 median and you see housing has outpaced general inflation dramatically.
The 1970s oil shocks deserve a closer look because they show how inflation spreads. OPEC’s 1973 embargo quadrupled oil prices; energy is an input to everything — transport, manufacturing, food — so the shock rippled through the whole basket. CPI hit 11.0% in 1974, eased, then the 1979 Iranian revolution spiked oil again: 13.5% in 1980. It took Volcker’s brutal rate hikes and two recessions to break the cycle.
Period Avg inflation What happened 1913–1920 ~9%/yr WWI + postwar boom; 1920 hit 15.6% 1929–1933 −6%/yr Great Depression deflation 1946–1948 ~10%/yr Post-WWII price controls lifted 1974–1981 ~9%/yr Oil shocks; 1980 peak 13.5% 1991–2019 ~2.3%/yr Great Moderation stability 2021–2022 ~6%/yr Pandemic supply shock; 2022: 8.0%
🎯 Which inflation rate should you assume?
There is no single correct rate — match it to your question. Long-run US average (~3%) is the default for 20–30 year retirement planning; CPI has averaged close to 3% over the last century. Recent CPI (2–4%) suits horizons under 5 years. Stress-test at 5–6%: if your retirement plan survives 5% inflation, it’s robust.
Consider personal inflation too: the CPI basket may not match your spending. Healthcare has risen ~5% annually for decades (faster than CPI), college tuition ~6–7%, while electronics fall in price. If you’re 30 years from retirement, healthcare-heavy future spending deserves a higher assumed rate than the headline 3%.
The most dangerous assumption is 0% — planning in “today’s dollars” without adjusting. A $1M retirement target in 30 years at 3% inflation needs $2.43M in future dollars to buy the same things (1M × 1.0330). Plan in future dollars or real terms, never in unadjusted today’s dollars.
The bond market publishes a live inflation forecast: the breakeven rate — the gap between nominal Treasury yields and TIPS yields. If 10-year Treasuries yield 4.5% and 10-year TIPS yield 2.0%, the market expects 2.5% average inflation. It’s not perfect, but it’s the collective wisdom of trillions of dollars — a better guess than any pundit.
To estimate your personal inflation rate: list your big spending categories with weights (housing 30%, food 15%, transport 15%, healthcare 10%, …), assign each a plausible rate, and take the weighted average. A renter in a hot market with high healthcare spending might face 4.5% personal inflation while headline CPI reads 3.0% — a gap that compounds into very different retirement targets.
💡 Beating inflation: what actually works
Cash at 0% loses ~3% of purchasing power yearly — $10,000 becomes $7,441 of buying power in a decade. What keeps up? Stocks averaged ~10% nominal (~7% real) over long periods. TIPS (Treasury Inflation-Protected Securities) adjust principal with CPI — a direct inflation hedge. I Bonds pay a composite rate tied to inflation, currently popular for emergency funds. Real estate tends to track inflation over decades since rents and values rise with prices.
What doesn’t: nominal bonds at fixed rates (a 4% bond with 3% inflation nets ~1% real), and especially cash. The hierarchy is simple — your money must earn more than inflation after taxes to grow in real terms. At 3% inflation and 25% tax, a 5% nominal return nets 3.75% after tax, barely 0.7% real.
Debt flips the script: inflation helps borrowers. A $300,000 mortgage at fixed 6% gets cheaper in real terms every year at 3% inflation — you’re repaying with future dollars worth less. This is why fixed-rate debt during inflationary periods transfers wealth from lenders to borrowers.
I Bonds deserve specifics: they pay a composite of a fixed rate plus inflation adjustments, reset semiannually, and you can buy $10,000/year electronically. The catch: you can’t touch them for 12 months, and cashing out before 5 years forfeits 3 months of interest. For money you won’t need for a year+, they’re the closest thing to a free inflation hedge.
The mortgage math: borrow $300,000 at 6% fixed while inflation runs 3%. After 10 years you’ve paid mostly interest, but the remaining balance is in dollars worth 1.0310 = 1.34× less — the real burden fell by a quarter while your wages (hopefully) rose with inflation. Contrast an adjustable-rate mortgage: the rate resets upward with inflation, wiping out the borrower’s advantage. Fixed-rate debt is the inflation hedge; ARMs are not.
⚠️ Inflation illusions and mistakes
Money illusion: a 5% raise with 8% inflation is a 3% pay cut in real terms — but it feels like a raise. Always subtract inflation before celebrating. Similarly, a home “gaining” 20% over 5 years at 4% annual inflation gained roughly zero in real terms (1.20 ÷ 1.217 = 0.986).
Recency bias: after 2021–2022’s spike, many assumed 6–8% forever; after the 2010s, many assumed 2% forever. Both were wrong. Use long-run averages for long plans, not the last two years.
Ignoring compounding: “3% for 30 years” sounds like 90% total — it’s actually 143% (1.0330 = 2.427). Linear intuition badly underestimates long-horizon inflation. Always compound.
Nominal vs real confusion: a pension paying “$50,000/year” for 25 years isn’t $1.25M of value — at 3% inflation its purchasing power totals roughly $871,000 in today’s dollars (50,000 × (1 − 1.03−25) ÷ 0.03). Discount future fixed payments before comparing them.
Bracket creep: without inflation-indexed tax brackets, a 5% raise during 5% inflation pushes you into a higher bracket on income that buys nothing more — a stealth tax increase. The US indexes federal brackets to CPI since 1985, but many state and local taxes don’t, and “temporary” thresholds (like the $10,000 SALT cap) erode in real terms every year Congress leaves them fixed.
Anchoring on old prices distorts decisions: “coffee was $1 in 1990!” — which is $2.46 in 2025 dollars (1 × 321.5/130.7), so today’s $2.50 coffee is fairly priced in real terms. Nostalgia prices are nominal illusions. Convert to today’s dollars before judging whether something “got expensive” — often it didn’t.
🏛️ CPI: the index behind the calculator
Every historical number on this page comes from one series, and I want you to know exactly what it is. The Consumer Price Index for All Urban Consumers (CPI-U) is the U.S. Bureau of Labor Statistics’ measure of what city households pay for a fixed basket of goods and services — food, rent, gasoline, medical care, clothing and hundreds of other items, with 1982–84 set as the base period (index = 100). When people ask me for a “CPI calculator,” this index ratio is the entire machine: there is no second dataset hiding behind it.
How BLS builds it: field collectors record tens of thousands of prices every month in 75 urban areas — from grocery stores, landlords, doctors’ offices and service providers — and the basket’s weights are refreshed from the Consumer Expenditure Survey, so the index tracks what households actually buy. In the December 2024 relative-importance release, shelter carried about 36% of the basket, food about 14%, and energy about 6% — which is why a rent increase moves the headline number more than a gasoline spike of the same size, even though the gasoline spike is the one you feel at the pump.
That gap between headline and category inflation is the thing I most want readers to take away. Headline CPI is a weighted average: in a year when energy surges, the headline can look alarming while the categories you actually spend on move gently; in a quiet year, your personal basket — heavy on tuition or healthcare — can be inflating twice as fast as the headline. This is also why BLS publishes “core” CPI, which strips out food and energy: not because food and energy don’t matter, but because their swings hide the trend in everything else.
The formula the Historical CPI tab uses is the one every inflation rate calculator is built on:
Adjusted value = Amount × CPItarget year ÷ CPIstart year
Worked example, start to finish: what is $100 from 1990 worth in 2025? CPI-U was 130.7 in 1990 and 321.943 in 2025, so 100 × 321.943 ÷ 130.7 = $246.32. And the inflation rate between any two years is the same ratio turned into a percentage: for 2022, (292.7 ÷ 271.0) − 1 = 8.0%. If you can do those two divisions, you can reproduce every historical figure on this page — I cite the source as U.S. Bureau of Labor Statistics, CPI-U, 1913–2026, because that is literally all I used.
One addition, for completeness: the Historical tab above can now also convert with five further official indexes — the BLS food, energy, medical care and shelter sub-indexes of the CPI, the UK CPI published by the Office for National Statistics, and the EU harmonised index of consumer prices (HICP) published by Eurostat. Pick one in the tab’s Price index menu; every result names the index it used, and the source line under the calculator gives each series’ coverage dates. Every figure in this guide remains CPI-U, exactly as cited.
📅 Inflation by year: the record years
I keep this table next to the calculator because single years teach what averages hide. These are the highest — and lowest — annual-average CPI-U inflation rates since 1913, every one recomputed from the index values on this page (rate = CPIthis year ÷ CPIlast year − 1). If you are using this page as an inflation calculator by year, these are the years your span will be judged against.
Year CPI-U Inflation rate What was happening 1918 15.1 +18.0% World War I spending peak — the highest in the series 1917 12.8 +17.4% War mobilization squeezes supply 1920 20.0 +15.6% Post-war boom, just before the 1921 crash in prices 1947 22.3 +14.4% Wartime price controls come off 1980 82.4 +13.5% Second oil shock; the modern-era peak 1979 72.6 +11.3% Energy crisis builds 2022 292.7 +8.0% Pandemic supply shock — highest in four decades 1933 13.0 −5.1% Great Depression deflation, final year 1931 15.2 −9.0% Depression deflation deepens 1932 13.7 −9.9% The worst deflation year of the 1930s 1921 17.9 −10.5% Sharpest single-year price fall in the series 2009 214.5 −0.4% Financial-crisis deflation — the only negative year since 1955
Two patterns matter for planning. First, the extremes cluster: war, the Depression, the 1970s, and 2021–22 — long calm stretches are the norm, and they are exactly when people stop respecting inflation. Second, deflation is not a gift: the negative years above came with collapsing wages and mass unemployment, which is why central banks target a small positive rate rather than zero. Across the full 1913–2025 span, the index rose from 9.9 to 321.9 — a cumulative 3,152% — which works out to an average of about 3.16% a year. That average, not any single scary year, is the number I plan around.
💼 COLA, raises and salary
Half the people who land on this page are really asking a pay question, so let me answer it directly. A cost of living adjustment (COLA) is a raise set to match inflation exactly — no better, no worse, just whole. When readers look for a cost of living adjustment calculator, what they usually need is this page’s Historical CPI tab plus one honest comparison, so here is the comparison I run.
Say you earned $60,000 in 2020. To have the same purchasing power in 2025, with CPI-U up from 258.811 to 321.943, your salary needed to reach 60,000 × 321.943 ÷ 258.811 = $74,636. If your pay stayed flat at $60,000, you took a real pay cut of about 19.6% — that $60,000 in 2025 buys what $48,234 bought in 2020. And if you got a steady, respectable 3% raise every year, you reached $69,556 — still $5,079 a year short of whole, because 2021–22 inflation (4.7% and 8.0%) outran the raises. That gap is why “my salary went up but I feel poorer” was the defining money sentence of the early 2020s.
Two practical notes from my side. First, formal COLAs — Social Security’s annual adjustment is the famous one — are set from a sister index (CPI-W) and announced each fall, so your benefit statement will never match this page to the decimal; the direction and rough size are what transfer. Second, when you negotiate, negotiate in these terms: “a 3% raise in a 4.7% inflation year is a pay cut” is a sentence with arithmetic behind it, and the Historical CPI tab gives you the exact years to cite. If your employer offers a “salary equivalent” for a transfer or a remote-work adjustment, run both offers through the same index before you compare — nominal salary comparisons across years are how people accidentally accept less.
🔮 Worked examples: since 2020, and projecting forward
How much has inflation increased since 2020? It is the question I am asked most, so here is the full working. CPI-U averaged 258.811 in 2020 and 321.943 in 2025, so cumulative inflation over the five years is (321.943 ÷ 258.811) − 1 = 24.4% — an average of about 4.5% a year, front-loaded into 2021–22. In money terms: $100 of 2020 spending power needs $124.39 in 2025, and a $200 weekly grocery shop in 2020 costs $248.79 for the same cart in 2025. If your income did not rise by roughly a quarter over that span, your standard of living quietly fell — that is the whole story of the post-pandemic squeeze in one ratio.
Projecting forward is a different animal, and I label it as one. There is no CPI for 2035, so the projection mode at the top of this page is a future inflation calculator in the honest sense: it grows your amount at a rate you assume, and the assumption does all the work. At an assumed 3%, $100 today needs to become $134.39 in 10 years, and a $50,000-a-year expense becomes $90,306 in 20 years. At an assumed 2.5%, the 10-year figure is $128.01 instead. Neither is a prediction — I show both so you can see how much of any “answer” is just the rate you fed in. Pick your assumption from the record above (the long-run average is about 3.16%), stress-test at 5%, and never let a projection travel without its assumed rate attached.
🔍 How I sanity-check an inflation number
People send me inflation figures from articles, videos and other calculators, and a surprising share of them are wrong. Before I trust any converted number — including my own — I run four checks, and you can too.
1. The direction check. Moving an old amount forward into today’s dollars must make it bigger in any inflationary era (the CPI ratio is above 1). If a tool tells you $100 in 1980 equals $80 today, it divided when it should have multiplied — the true figure is $390.71.
2. The anchor check. I keep one conversion memorized: $100 in 2000 = $186.96 in 2025, this calculator’s own default. Any claim for a nearby year has to sit sensibly around it — $100 in 1990 must be more than $186.96 (it is $246.32), and $100 in 2010 must be less (it is $147.64). A claim that breaks the ordering is wrong, whatever the website looks like.
3. The average-rate check. Break the claimed total change down into an annual average and ask whether that era really felt like that. 2010–2020 averaged just 1.73% a year; 1970–1980 averaged 7.82%. A claim implying 6% average inflation across the 2010s fails history, not arithmetic.
4. The doubling check. At the claimed average rate, does the doubling time (72 ÷ rate) match the span? Prices across 2000–2025 rose 87.0% — close to one doubling in 25 years, which fits the era’s ~2.5% average (72 ÷ 2.53 ≈ 28 years, the right neighbourhood). If the doubling math and the total disagree, one of them is invented.
Explore more finance tools
The complete guide to inflation
Everything about how inflation erodes money — the math, the history, and how to plan around it.
📌 Current & recent US inflation rates
If you came looking for the current US inflation rate, here it is with its working shown: the US inflation rate current as of the latest published annual average — 2025 — is 2.63% (CPI-U 321.943, up from 313.689 in 2024). That is the annual-average basis this calculator uses, from the same CPI-U series, 1913–2026, that powers the Historical tab above.
I recompute every rate above from the CPI-U annual averages on this page (rate = CPIyear ÷ CPIprior year − 1), so you can audit each one against the table in the Historical tab. News headlines usually quote the latest month’s 12-month change instead — the same index, sliced differently — which is why the figure you saw this morning may differ slightly. Source: U.S. Bureau of Labor Statistics, CPI-U annual averages.
📉 What inflation does to your money
Inflation is the gradual rise in prices that shrinks what each dollar buys. At 3% annual inflation, $10,000 of today’s spending power costs $13,439.16 in 10 years (10,000 × 1.0310), and $10,000 in 10 years buys what $7,441 buys today (10,000 ÷ 1.0310). The erosion compounds: you lose 2.9% of purchasing power in year one but the losses accelerate as the base shrinks.
The two directions matter for different questions. Future cost (multiplying by 1.03n) answers “what will my expenses become?” — essential for retirement planning. Today’s value (dividing by 1.03n) answers “what is that future sum really worth?” — essential for evaluating pensions, settlements, or lottery payouts. The calculator above does both.
Deflation — negative inflation — reverses the math: prices fall and money gains purchasing power. Japan experienced mild deflation in the 2000s; the US saw brief deflation in 2009 (−0.4%) and 2015 (−0.1%). The Historical CPI tab handles these automatically since it uses actual index values.
Watch for shrinkflation — inflation’s sneaky cousin. When a cereal box drops from 500g to 400g at the same price, that’s a 25% price increase per gram that never shows up on the price tag (though it does show in CPI, which tracks unit prices). Skimpflation (cheaper ingredients, same price) works the same way. The sticker price is only half the story — always compare price per unit.
Why does inflation persist? The wage-price spiral: workers demand higher wages to afford rising prices, businesses raise prices to cover higher wages, repeat. Central banks fight this by raising interest rates, which cools spending — the standard playbook Volcker used in 1980–82, when the Fed funds rate hit 20% to break double-digit inflation.
🧮 The math: compounding in reverse
Inflation compounds exactly like investment growth, working against you: Future cost = Amount × (1 + i)n and Today’s value = Amount ÷ (1 + i)n, where i is the annual rate and n is years. Worked example: $100 at 3% for 10 years → 100 × 1.0310 = 100 × 1.343916 = $134.39. Reverse: 100 ÷ 1.343916 = $74.41.
The Rule of 72 gives quick estimates: divide 72 by the rate to get doubling time. At 3%, prices double every 24 years (72 ÷ 3). At 8% — the 2022 US rate — prices double every 9 years. For halving purchasing power, same math: at 3%, your money’s buying power halves every 24 years.
To convert between nominal and real: real rate ≈ (1 + nominal) ÷ (1 + inflation) − 1. An 8% investment return with 3% inflation is (1.08 ÷ 1.03) − 1 = 4.85% real — not 5%. The simple subtraction (8 − 3 = 5) is a close approximation but the division is exact.
For precise work, economists use continuous compounding: Future = Amount × ert. At 3% for 10 years: 100 × e0.30 = 100 × 1.34986 = $134.99 — barely different from the $134.39 discrete result. The gap only matters at high rates or long horizons, but it’s the form you’ll see in academic papers.
Present value is the same math in reverse and it’s how professionals price everything: a $100,000 lump sum due in 20 years at 3% inflation is worth 100,000 ÷ 1.0320 = 100,000 ÷ 1.80611 = $55,368 today. That single number lets you compare a future payout against cash in hand — use the calculator’s “Today’s value” mode for exactly this.
| Rate | 10 years | 20 years | $10,000 → future cost (10yr) |
|---|---|---|---|
| 2% | ×1.219 | ×1.486 | $12,190 |
| 3% | ×1.344 | ×1.806 | $13,439 |
| 5% | ×1.629 | ×2.653 | $16,289 |
| 8% | ×2.159 | ×4.661 | $21,589 |
🏛️ A century of US inflation: what the CPI shows
The Consumer Price Index (CPI-U) tracks a basket of consumer goods since 1913. $100 in 1913 (CPI 9.9) has the buying power of $3,252 in 2025 (CPI 321.943) — prices rose roughly 32-fold in 112 years, averaging about 3.1% annually.
The history has distinct eras. The 1970s stagflation peaked at 13.5% in 1980 — the highest in the series — driven by oil shocks. Paul Volcker’s Federal Reserve crushed it with double-digit interest rates, bringing inflation to 3–4% by the mid-1980s. The Great Moderation (1990s–2019) averaged under 2.5%, with brief deflation in 2009. Then 2021–2022 spiked to 8.0% on pandemic supply shocks — the fastest since 1981.
Try the Historical CPI tab: $1 in 1980 ($82.4 index) equals $3.91 in 2025. $1,000 in 2000 equals $1,870 in 2025. And going backward: $1,000,000 in 2025 buys what $30,751 bought in 1913 — a vivid way to grasp a century of erosion.
Some landmarks worth trying: a 1935 Ford cost about $625 — roughly $14,670 in 2025 dollars (625 × 321.5/13.7). A 1965 Mustang at $2,368 sticker becomes about $24,170 today (2368 × 321.5/31.5). Median US home price in 1980 was ~$47,200, or $184,414 in 2025 dollars — compare that to today’s ~$420,000 median and you see housing has outpaced general inflation dramatically.
The 1970s oil shocks deserve a closer look because they show how inflation spreads. OPEC’s 1973 embargo quadrupled oil prices; energy is an input to everything — transport, manufacturing, food — so the shock rippled through the whole basket. CPI hit 11.0% in 1974, eased, then the 1979 Iranian revolution spiked oil again: 13.5% in 1980. It took Volcker’s brutal rate hikes and two recessions to break the cycle.
| Period | Avg inflation | What happened |
|---|---|---|
| 1913–1920 | ~9%/yr | WWI + postwar boom; 1920 hit 15.6% |
| 1929–1933 | −6%/yr | Great Depression deflation |
| 1946–1948 | ~10%/yr | Post-WWII price controls lifted |
| 1974–1981 | ~9%/yr | Oil shocks; 1980 peak 13.5% |
| 1991–2019 | ~2.3%/yr | Great Moderation stability |
| 2021–2022 | ~6%/yr | Pandemic supply shock; 2022: 8.0% |
🎯 Which inflation rate should you assume?
There is no single correct rate — match it to your question. Long-run US average (~3%) is the default for 20–30 year retirement planning; CPI has averaged close to 3% over the last century. Recent CPI (2–4%) suits horizons under 5 years. Stress-test at 5–6%: if your retirement plan survives 5% inflation, it’s robust.
Consider personal inflation too: the CPI basket may not match your spending. Healthcare has risen ~5% annually for decades (faster than CPI), college tuition ~6–7%, while electronics fall in price. If you’re 30 years from retirement, healthcare-heavy future spending deserves a higher assumed rate than the headline 3%.
The most dangerous assumption is 0% — planning in “today’s dollars” without adjusting. A $1M retirement target in 30 years at 3% inflation needs $2.43M in future dollars to buy the same things (1M × 1.0330). Plan in future dollars or real terms, never in unadjusted today’s dollars.
The bond market publishes a live inflation forecast: the breakeven rate — the gap between nominal Treasury yields and TIPS yields. If 10-year Treasuries yield 4.5% and 10-year TIPS yield 2.0%, the market expects 2.5% average inflation. It’s not perfect, but it’s the collective wisdom of trillions of dollars — a better guess than any pundit.
To estimate your personal inflation rate: list your big spending categories with weights (housing 30%, food 15%, transport 15%, healthcare 10%, …), assign each a plausible rate, and take the weighted average. A renter in a hot market with high healthcare spending might face 4.5% personal inflation while headline CPI reads 3.0% — a gap that compounds into very different retirement targets.
💡 Beating inflation: what actually works
Cash at 0% loses ~3% of purchasing power yearly — $10,000 becomes $7,441 of buying power in a decade. What keeps up? Stocks averaged ~10% nominal (~7% real) over long periods. TIPS (Treasury Inflation-Protected Securities) adjust principal with CPI — a direct inflation hedge. I Bonds pay a composite rate tied to inflation, currently popular for emergency funds. Real estate tends to track inflation over decades since rents and values rise with prices.
What doesn’t: nominal bonds at fixed rates (a 4% bond with 3% inflation nets ~1% real), and especially cash. The hierarchy is simple — your money must earn more than inflation after taxes to grow in real terms. At 3% inflation and 25% tax, a 5% nominal return nets 3.75% after tax, barely 0.7% real.
Debt flips the script: inflation helps borrowers. A $300,000 mortgage at fixed 6% gets cheaper in real terms every year at 3% inflation — you’re repaying with future dollars worth less. This is why fixed-rate debt during inflationary periods transfers wealth from lenders to borrowers.
I Bonds deserve specifics: they pay a composite of a fixed rate plus inflation adjustments, reset semiannually, and you can buy $10,000/year electronically. The catch: you can’t touch them for 12 months, and cashing out before 5 years forfeits 3 months of interest. For money you won’t need for a year+, they’re the closest thing to a free inflation hedge.
The mortgage math: borrow $300,000 at 6% fixed while inflation runs 3%. After 10 years you’ve paid mostly interest, but the remaining balance is in dollars worth 1.0310 = 1.34× less — the real burden fell by a quarter while your wages (hopefully) rose with inflation. Contrast an adjustable-rate mortgage: the rate resets upward with inflation, wiping out the borrower’s advantage. Fixed-rate debt is the inflation hedge; ARMs are not.
⚠️ Inflation illusions and mistakes
Money illusion: a 5% raise with 8% inflation is a 3% pay cut in real terms — but it feels like a raise. Always subtract inflation before celebrating. Similarly, a home “gaining” 20% over 5 years at 4% annual inflation gained roughly zero in real terms (1.20 ÷ 1.217 = 0.986).
Recency bias: after 2021–2022’s spike, many assumed 6–8% forever; after the 2010s, many assumed 2% forever. Both were wrong. Use long-run averages for long plans, not the last two years.
Ignoring compounding: “3% for 30 years” sounds like 90% total — it’s actually 143% (1.0330 = 2.427). Linear intuition badly underestimates long-horizon inflation. Always compound.
Nominal vs real confusion: a pension paying “$50,000/year” for 25 years isn’t $1.25M of value — at 3% inflation its purchasing power totals roughly $871,000 in today’s dollars (50,000 × (1 − 1.03−25) ÷ 0.03). Discount future fixed payments before comparing them.
Bracket creep: without inflation-indexed tax brackets, a 5% raise during 5% inflation pushes you into a higher bracket on income that buys nothing more — a stealth tax increase. The US indexes federal brackets to CPI since 1985, but many state and local taxes don’t, and “temporary” thresholds (like the $10,000 SALT cap) erode in real terms every year Congress leaves them fixed.
Anchoring on old prices distorts decisions: “coffee was $1 in 1990!” — which is $2.46 in 2025 dollars (1 × 321.5/130.7), so today’s $2.50 coffee is fairly priced in real terms. Nostalgia prices are nominal illusions. Convert to today’s dollars before judging whether something “got expensive” — often it didn’t.
🏛️ CPI: the index behind the calculator
Every historical number on this page comes from one series, and I want you to know exactly what it is. The Consumer Price Index for All Urban Consumers (CPI-U) is the U.S. Bureau of Labor Statistics’ measure of what city households pay for a fixed basket of goods and services — food, rent, gasoline, medical care, clothing and hundreds of other items, with 1982–84 set as the base period (index = 100). When people ask me for a “CPI calculator,” this index ratio is the entire machine: there is no second dataset hiding behind it.
How BLS builds it: field collectors record tens of thousands of prices every month in 75 urban areas — from grocery stores, landlords, doctors’ offices and service providers — and the basket’s weights are refreshed from the Consumer Expenditure Survey, so the index tracks what households actually buy. In the December 2024 relative-importance release, shelter carried about 36% of the basket, food about 14%, and energy about 6% — which is why a rent increase moves the headline number more than a gasoline spike of the same size, even though the gasoline spike is the one you feel at the pump.
That gap between headline and category inflation is the thing I most want readers to take away. Headline CPI is a weighted average: in a year when energy surges, the headline can look alarming while the categories you actually spend on move gently; in a quiet year, your personal basket — heavy on tuition or healthcare — can be inflating twice as fast as the headline. This is also why BLS publishes “core” CPI, which strips out food and energy: not because food and energy don’t matter, but because their swings hide the trend in everything else.
The formula the Historical CPI tab uses is the one every inflation rate calculator is built on:
Worked example, start to finish: what is $100 from 1990 worth in 2025? CPI-U was 130.7 in 1990 and 321.943 in 2025, so 100 × 321.943 ÷ 130.7 = $246.32. And the inflation rate between any two years is the same ratio turned into a percentage: for 2022, (292.7 ÷ 271.0) − 1 = 8.0%. If you can do those two divisions, you can reproduce every historical figure on this page — I cite the source as U.S. Bureau of Labor Statistics, CPI-U, 1913–2026, because that is literally all I used.
One addition, for completeness: the Historical tab above can now also convert with five further official indexes — the BLS food, energy, medical care and shelter sub-indexes of the CPI, the UK CPI published by the Office for National Statistics, and the EU harmonised index of consumer prices (HICP) published by Eurostat. Pick one in the tab’s Price index menu; every result names the index it used, and the source line under the calculator gives each series’ coverage dates. Every figure in this guide remains CPI-U, exactly as cited.
📅 Inflation by year: the record years
I keep this table next to the calculator because single years teach what averages hide. These are the highest — and lowest — annual-average CPI-U inflation rates since 1913, every one recomputed from the index values on this page (rate = CPIthis year ÷ CPIlast year − 1). If you are using this page as an inflation calculator by year, these are the years your span will be judged against.
| Year | CPI-U | Inflation rate | What was happening |
|---|---|---|---|
| 1918 | 15.1 | +18.0% | World War I spending peak — the highest in the series |
| 1917 | 12.8 | +17.4% | War mobilization squeezes supply |
| 1920 | 20.0 | +15.6% | Post-war boom, just before the 1921 crash in prices |
| 1947 | 22.3 | +14.4% | Wartime price controls come off |
| 1980 | 82.4 | +13.5% | Second oil shock; the modern-era peak |
| 1979 | 72.6 | +11.3% | Energy crisis builds |
| 2022 | 292.7 | +8.0% | Pandemic supply shock — highest in four decades |
| 1933 | 13.0 | −5.1% | Great Depression deflation, final year |
| 1931 | 15.2 | −9.0% | Depression deflation deepens |
| 1932 | 13.7 | −9.9% | The worst deflation year of the 1930s |
| 1921 | 17.9 | −10.5% | Sharpest single-year price fall in the series |
| 2009 | 214.5 | −0.4% | Financial-crisis deflation — the only negative year since 1955 |
Two patterns matter for planning. First, the extremes cluster: war, the Depression, the 1970s, and 2021–22 — long calm stretches are the norm, and they are exactly when people stop respecting inflation. Second, deflation is not a gift: the negative years above came with collapsing wages and mass unemployment, which is why central banks target a small positive rate rather than zero. Across the full 1913–2025 span, the index rose from 9.9 to 321.9 — a cumulative 3,152% — which works out to an average of about 3.16% a year. That average, not any single scary year, is the number I plan around.
💼 COLA, raises and salary
Half the people who land on this page are really asking a pay question, so let me answer it directly. A cost of living adjustment (COLA) is a raise set to match inflation exactly — no better, no worse, just whole. When readers look for a cost of living adjustment calculator, what they usually need is this page’s Historical CPI tab plus one honest comparison, so here is the comparison I run.
Say you earned $60,000 in 2020. To have the same purchasing power in 2025, with CPI-U up from 258.811 to 321.943, your salary needed to reach 60,000 × 321.943 ÷ 258.811 = $74,636. If your pay stayed flat at $60,000, you took a real pay cut of about 19.6% — that $60,000 in 2025 buys what $48,234 bought in 2020. And if you got a steady, respectable 3% raise every year, you reached $69,556 — still $5,079 a year short of whole, because 2021–22 inflation (4.7% and 8.0%) outran the raises. That gap is why “my salary went up but I feel poorer” was the defining money sentence of the early 2020s.
Two practical notes from my side. First, formal COLAs — Social Security’s annual adjustment is the famous one — are set from a sister index (CPI-W) and announced each fall, so your benefit statement will never match this page to the decimal; the direction and rough size are what transfer. Second, when you negotiate, negotiate in these terms: “a 3% raise in a 4.7% inflation year is a pay cut” is a sentence with arithmetic behind it, and the Historical CPI tab gives you the exact years to cite. If your employer offers a “salary equivalent” for a transfer or a remote-work adjustment, run both offers through the same index before you compare — nominal salary comparisons across years are how people accidentally accept less.
🔮 Worked examples: since 2020, and projecting forward
How much has inflation increased since 2020? It is the question I am asked most, so here is the full working. CPI-U averaged 258.811 in 2020 and 321.943 in 2025, so cumulative inflation over the five years is (321.943 ÷ 258.811) − 1 = 24.4% — an average of about 4.5% a year, front-loaded into 2021–22. In money terms: $100 of 2020 spending power needs $124.39 in 2025, and a $200 weekly grocery shop in 2020 costs $248.79 for the same cart in 2025. If your income did not rise by roughly a quarter over that span, your standard of living quietly fell — that is the whole story of the post-pandemic squeeze in one ratio.
Projecting forward is a different animal, and I label it as one. There is no CPI for 2035, so the projection mode at the top of this page is a future inflation calculator in the honest sense: it grows your amount at a rate you assume, and the assumption does all the work. At an assumed 3%, $100 today needs to become $134.39 in 10 years, and a $50,000-a-year expense becomes $90,306 in 20 years. At an assumed 2.5%, the 10-year figure is $128.01 instead. Neither is a prediction — I show both so you can see how much of any “answer” is just the rate you fed in. Pick your assumption from the record above (the long-run average is about 3.16%), stress-test at 5%, and never let a projection travel without its assumed rate attached.
🔍 How I sanity-check an inflation number
People send me inflation figures from articles, videos and other calculators, and a surprising share of them are wrong. Before I trust any converted number — including my own — I run four checks, and you can too.
1. The direction check. Moving an old amount forward into today’s dollars must make it bigger in any inflationary era (the CPI ratio is above 1). If a tool tells you $100 in 1980 equals $80 today, it divided when it should have multiplied — the true figure is $390.71.
2. The anchor check. I keep one conversion memorized: $100 in 2000 = $186.96 in 2025, this calculator’s own default. Any claim for a nearby year has to sit sensibly around it — $100 in 1990 must be more than $186.96 (it is $246.32), and $100 in 2010 must be less (it is $147.64). A claim that breaks the ordering is wrong, whatever the website looks like.
3. The average-rate check. Break the claimed total change down into an annual average and ask whether that era really felt like that. 2010–2020 averaged just 1.73% a year; 1970–1980 averaged 7.82%. A claim implying 6% average inflation across the 2010s fails history, not arithmetic.
4. The doubling check. At the claimed average rate, does the doubling time (72 ÷ rate) match the span? Prices across 2000–2025 rose 87.0% — close to one doubling in 25 years, which fits the era’s ~2.5% average (72 ÷ 2.53 ≈ 28 years, the right neighbourhood). If the doubling math and the total disagree, one of them is invented.
How it works
Type the dollar amount you want to convert — today’s money or a future sum.
Use the long-run US average (~3%), or test a custom rate to stress-test your plans.
See the converted value, total erosion, and a year-by-year breakdown instantly.
The formula behind it
Compound inflation, both directions
Inflation compounds exactly like investment growth — it just works against you.
Worked example: $100 today at 3% inflation for 10 years.
The other way: today’s value of $100 in 10 years = 100 ÷ 1.343916 = $74.41
Erosion = 134.39 − 100 = $34.39; purchasing power kept = 100 ÷ 134.39 = 74.4%
Go deeper
Why a “small” 3% inflation rate is a big deal
Three percent sounds harmless — until you compound it. At 3% a year, prices double roughly every 24 years (the rule of 72: 72 ÷ 3 = 24). A $10,000 expense today becomes about $20,000 in 24 years and roughly $40,000 in 48 years.
This is why cash sitting in a 0%-interest account silently loses ground. Any savings plan that ignores inflation is planning with yesterday’s dollars. The table above shows exactly how your money shrinks year by year — use it to sanity-check your retirement target, emergency fund, or long-term budget.
Which inflation rate should you use?
There is no single “correct” rate — it depends on your question:
Long-run US average (~3%) — the default for 20–30 year retirement planning. US CPI has averaged close to 3% over the last century.
Recent CPI (2–4%) — better for short horizons under 5 years, where current conditions dominate.
Stress-test rate (5–6%) — run your plan at a high rate too. If your retirement still works at 5% inflation, it is robust. Treat the 3% result as the base case and the 5% result as the safety margin.
Frequently asked questions
What is the inflation calculator used for?
It converts money across time so you compare like with like. Two main uses: (1) see what today’s expenses will cost in the future — e.g., what a $10,000 budget becomes in 10 years at 3% inflation ($13,439); (2) see what a future lump sum is worth in today’s dollars — e.g., $100,000 in 20 years at 3% buys what $55,368 buys today.
How do you calculate future cost with inflation?
Multiply by the compound factor: Future cost = Amount × (1 + i)n, where i is the annual inflation rate and n is the number of years. For $100 at 3% over 10 years: 100 × 1.0310 = $134.39.
What will $1 million be worth in 20 years?
At 3% annual inflation, $1,000,000 in 20 years has the buying power of about $553,676 today (1,000,000 ÷ 1.0320). At 5%, it drops to roughly $376,889. Use the calculator above with the “Today’s value of future money” mode for your own numbers.
What is a realistic inflation rate to assume?
For long-term planning, 3% matches the long-run US average. For short horizons (under 5 years), check the latest CPI — it has typically ranged 2–4% in recent years. Always run a stress test at 5% as well to see whether your plan holds up.
Does this calculator account for taxes or investment returns?
No — it isolates the pure effect of inflation on purchasing power. To see whether your investments beat inflation, pair it with our investment calculator or compound interest calculator and compare the nominal growth against the inflation-eroded value.
Why does purchasing power fall faster than prices rise?
Because of compounding in reverse: value = amount ÷ (1 + i)n. Each year’s inflation eats into an already-shrunken base, so the loss accelerates. After 10 years at 3%, you keep 74.4% of purchasing power; after 24 years, only about half.
How do I convert dollars between two historical years?
Use the Historical CPI tab: enter the amount and pick the from/to years. The default index is actual CPI-U data from the U.S. Bureau of Labor Statistics (1913–2026), by annual average or by month; the tab can also convert with the BLS food, energy, medical care and shelter sub-indexes, and with UK CPI (ONS) and EU HICP (Eurostat) for conversions inside UK or EU prices. For example, $100 in 2000 converts to $186.96 in 2025 dollars.
What inflation rate should I use for retirement planning?
The long-run U.S. average is about 3% per year, which suits 20–30 year horizons. Use 2–4% for short horizons, and stress-test at 5–6% to check your plan is robust. Never assume 0% — a $1M target in 30 years needs $2.43M in future dollars at 3% inflation.
What is the difference between the CPI and my personal inflation rate?
CPI tracks a fixed national basket of goods, but your spending mix differs. Healthcare (~5%/yr) and college tuition (~6–7%/yr) have long outpaced headline CPI, while electronics got cheaper. If your future spending is healthcare-heavy, assume a higher rate than 3%.
Can this calculator convert between currencies, like dollars to euros?
No — and the distinction matters. A currency converter swaps dollars for euros or pounds at today’s exchange rate. This page is an inflation converter: it moves the same dollars across time, using the CPI to hold buying power constant. If your amount starts in another currency, convert it to US dollars first at the current exchange rate, then use this calculator to move it across years — with the default U.S. CPI-U index, every result is in US dollars. The same tab can also convert an amount inside UK prices (UK CPI) or EU prices (HICP), shown as a plain number — still an inflation conversion within one set of prices, never an exchange-rate conversion.
How do I run the calculation backwards — today’s dollars into a past year?
Use the Historical CPI tab and simply reverse the years: enter your amount, set the from year to 2025 and the to year to the past year you want. For example, $100 in 2025 equals $53.49 in 2000 dollars and $40.60 in 1990 dollars. Going the other way in time works differently: no CPI exists for future years yet, so the future inflation calculator mode at the top projects forward at a rate you assume — treat that rate as an assumption, never as data.
How do I calculate inflation from CPI?
Take the CPI for the later year minus the CPI for the earlier year, divide by the earlier year’s CPI, and multiply by 100. If the index rises from 100 to 103, the inflation rate is 3 divided by 100, which is 3%. The CPI is the official consumer price series published by the national statistics authority, in the United States the Bureau of Labor Statistics, and the same division works for any two years in the same series.
How much is an inflation raise?
Multiply current pay by the inflation rate: at 3% inflation, a $50,000 salary needs $50,000 times 1.03, which is $51,500, to buy the same basket. A cost-of-living adjustment, or COLA, is a pay rise set to an inflation measure for exactly this purpose, but it is not automatic in most jobs: it must be agreed, and it may use a different measure or a different period from the one you assumed.
Are inflation calculators accurate?
The arithmetic is exact; the assumption is the uncertainty. A calculator converts money at the rate you enter, so its answer is only as good as that rate and the index behind it. Headline CPI tracks a national average basket, while your own spending may rise faster or slower. Run the calculation at more than one rate, and treat the spread between the results as the honest answer.