How Long Does Alcohol Stay in Your System? – BAC Elimination Calculator
Your body clears alcohol at a roughly steady rate — enter what you drank and see the estimated level now, and when it reaches zero.
What you drank, and when
Two inputs live in Advanced options further down this page — the clock start time and the elimination-rate (β) slider — and the timeline updates live from them too. The Calculate button above simply re-runs the same live calculation and moves to the results.
🔒 Private by design: the whole calculation runs in this page. Your numbers are never sent anywhere.
⚠ Read this before the numbers
This calculator gives a rough estimate, not a measurement. Real blood alcohol varies with food in your stomach, medication, health, fatigue and how generously drinks were poured, and your true level can be higher than any figure shown here. Never use this page — or any calculator — to decide whether you are fit to drive. After drinking, the only safe choice is not to drive at all: use a taxi, a rideshare, a designated driver, or wait until the following day. If someone who has been drinking is hard to wake, breathing slowly or irregularly, vomiting while unconscious, or having seizures, treat it as an emergency and call your local emergency number.
Your body clears alcohol at a roughly steady rate — about one standard drink every hour and a half — and nothing you eat, drink or do makes that clock run faster. Enter what you drank, your body weight and when you started, and this page works out an estimated blood alcohol level now, when it falls under common legal limits, and when the estimate reaches zero. It uses the Widmark formula, printed in full below, and it is an estimate only — the box underneath explains why it must never be the reason anyone gets behind a wheel.
Key takeaways
- Alcohol clears at a near-steady rate of about 0.015 BAC points per hour — roughly one standard drink every hour and a half — and nothing you eat, drink or do makes that clock run faster.
- Blood and breath clear in hours, but laboratory tests reach much further back: urine EtG for up to about 80 hours after heavy drinking, and hair for up to about 90 days.
- Every figure on this page is a Widmark estimate, not a measurement — never use it, at any level above 0.00 or at an estimated 0.00, to decide whether anyone is fit to drive.
Contents
- Your estimated timeline
- Your BAC, hour by hour
- How the estimate is worked out, in three steps
- The formula in the open, with the worked example
- Detection windows by test: what each test actually measures
- Morning-after arithmetic: worked examples
- Why the estimate can be wrong, and by how much
- Going deeper
- Frequently asked questions
- Related calculators
Advanced options — start time and elimination rate
The start time only puts clock times on the milestones — it never changes the BAC figure itself. The β slider changes the slope: the results always print the slowest-rate zero time as well, and planning around that slowest figure is the cautious way to read any timeline here.
Your estimated timeline
⚠ This estimate is in the danger zone
An estimated starting level above 0.40 is associated with coma and death. If anyone actually drank this much, treat it as a medical emergency: call your local emergency number now, keep the person on their side, and do not leave them alone. Do not wait for a calculator timeline.
Straight after finishing, before any time has passed. This is a formula’s best guess about an average body — your real level could be higher, and how you feel is not a measure of it.
Zero in about 6.7 hours from your first drinkThe milestones, from your first drink
Time is the only thing that lowers this number
Coffee, a cold shower, fresh air, exercise and a big meal after the fact do not speed up elimination — the liver clears alcohol at its own steady pace regardless. Food eaten before or while drinking can slow how fast alcohol is absorbed, which lowers the peak a little, but it does not shorten the tail. Plan around the slowest figure above, not the fastest, and never plan to drive on any of them.
Read this figure for what it is: a Widmark estimate
Every number above is a Widmark estimate built on population averages — the r factors and the β rate are averages, your pours are estimates, and absorption timing shifts the real curve by up to an hour or so. It is not a breath test, a blood test, a medical assessment, or a fitness-to-drive verdict. An estimated BAC above 0.00 is never framed on this page as safe to drive, and an estimated 0.00 is not a verdict that anyone is sober, unimpaired, rested, or legally permitted to drive. After drinking, the safe rule stays the same: do not drive at all.
Method: the Widmark formula, printed in full below. Peak BAC = grams of alcohol / (body weight in kg × 1000 × r) × 100, then a straight-line fall of β per hour. One fluid ounce of pure alcohol weighs 23.33 g, which is why each standard drink works out to almost exactly 14 g.
Your BAC, hour by hour
The Widmark model draws a straight line: the estimate starts at its peak the moment the alcohol is in, then falls by the same amount every hour until it reaches zero. The dashed lines are the two driving limits people ask about most — crossing below one is a legal fact in some places, never proof that anyone is fit to drive.
| Hours since first drink | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|---|
| Estimated BAC | 0.101 | 0.086 | 0.071 | 0.056 | 0.041 | 0.026 | 0.011 | 0.000 |
Read the table the careful way: even the last columns are estimates about an average body, and alcohol can still be detected by laboratory tests long after the BAC estimate reaches zero — the deep-dive section below explains the difference.
Keep exploring
Water Intake Calculator
How much water a day your body actually needs — the one drink that does help the morning after.
⚖️BMI Calculator
The weight-for-height index behind the body weight you just entered.
🍽️Calorie Calculator
Daily calories for your size and activity — drinks included, at about 100 kcal a standard drink.
How the estimate is worked out, in three steps
Count the pure alcohol
Every drink is converted to grams of pure alcohol. A standard drink — 12 oz of beer at 5%, 5 oz of wine at 12%, a 1.5 oz shot at 40% — holds almost exactly 14 g. Custom drinks are worked out from size and strength.
Spread it through body water
The Widmark formula divides those grams by the water in your body — your weight in kilograms times the factor r (0.68 for men, 0.55 for women) — to get the peak BAC if it were all absorbed at once.
Run the clock backwards
The body then burns alcohol off at β per hour — 0.015 on average. Subtracting β × hours since your first drink from the peak gives the estimate now, and dividing the peak by β gives the wait until zero.
The formula in the open, with the worked example
Here is this page’s default example — a man of 180 lb (81.6 kg) who had four standard beers. Four drinks at 14 g each is 56 g of alcohol, and 56 / (81.6 × 1000 × 0.68) × 100 = 0.101.
| Step | Working | Result |
|---|---|---|
| Alcohol in | 4 drinks × 14 g | 56 g |
| Peak BAC | 56 / (81.6 × 1000 × 0.68) × 100 | 0.101 |
| After 2 hours | 0.101 − 0.015 × 2 | 0.071 |
| Below 0.08 | (0.101 − 0.08) / 0.015 | 1.4 h |
| Zero | 0.101 / 0.015 | 6.7 h |
The same maths for a woman of 140 lb (63.5 kg) after three drinks gives a peak of 42 / (63.5 × 1000 × 0.55) × 100 = 0.120, and a wait of 8.0 hours to zero — the smaller body-water share, not the number of drinks, is what pushes her figure higher.
Why “I feel fine” is not a measurement
Feeling sober and being sober part company quickly. Tolerance — built up by regular drinking — dulls the felt effects of alcohol without lowering the level in your blood at all, and tiredness, which genuinely does impair driving, feels identical to mild drunkenness in the other direction. The research picture is consistent: judgement and reaction time are measurably worse well below 0.08, and people are poor judges of their own impairment at exactly the levels where it matters. That is why this page prints times and estimates, but never a verdict that anyone is safe to drive — there is no honest version of that verdict a calculator can give.
Assumptions, printed rather than buried
- Instant absorption. The Widmark model treats the peak as if all the alcohol were absorbed the moment drinking started. In reality the peak arrives 30 to 90 minutes after the last drink, so early readings here run high and readings just after a final drink run low. Treat the whole timeline as approximate, shifted by up to an hour or so.
- A straight line down. Elimination is modelled as a fixed β per hour. Real clearance varies between people (about 0.010 to 0.025 per hour) and slows a little at very low levels, which is one reason the results always print the slowest-rate zero time as well.
- Standard pours. The presets assume exactly 12 oz at 5%, 5 oz at 12% and 1.5 oz at 40%. Restaurant pours, home measures and craft beers routinely hold 1.5 to 2 standard drinks each — if in doubt, enter the custom size and strength, or count generously.
- Average body water. The r factors (0.68 men, 0.55 women) are population averages. Body composition, age and some medications move an individual’s real figure in either direction.
- Limits are legal lines, not safety lines. The 0.08 and 0.05 milestones are shown because people ask for them. Impairment begins with the first drink, and several places set the legal limit at 0.02 or zero for some drivers.
Detection windows by test: what each test actually measures
Blood alcohol and detectable alcohol are not the same thing. A breath or blood test measures ethanol itself, which is gone once the Widmark estimate reaches zero. Most laboratory tests measure something else — a breakdown product that outlives the alcohol by days, or a marker trapped in hair for months. That is why two tests taken on the same day can honestly disagree, and why a clear breath result never promises a clear urine result.
| Test | Typical detection window | What it actually measures | What it cannot tell you |
|---|---|---|---|
| Breath | 12–24 hours | Ethanol leaving through the lungs; tracks blood closely | Whether you drank days ago |
| Blood (ethanol) | Up to about 12 hours, toward 24 after heavy drinking | Ethanol in the blood; the closest measure to current impairment | Anything once ethanol has cleared |
| Blood (PEth) | 3–4 weeks | Phosphatidylethanol, a biomarker formed only when alcohol is present | Your BAC at any earlier moment |
| Saliva (oral fluid) | 12–24 hours; some labs quote up to 48 | Ethanol in oral fluid, similar to breath for recent use | Drinking beyond the last day or two |
| Urine (ethanol itself) | 12–24 hours | Unchanged ethanol filtered into urine | Drinking once ethanol has left the urine |
| Urine (EtG and EtS) | 24–72 hours typically; up to about 80 hours after heavy drinking | Ethyl glucuronide and ethyl sulfate, metabolites of ethanol | How much you drank, or exactly when |
| Hair | Up to about 90 days | EtG trapped in the hair shaft as it grows; a standard 1.5-inch sample covers roughly 90 days | A single occasion, or timing within that window |
Why EtG outlasts ethanol by days
Only a tiny share of alcohol leaves the body unchanged. The liver converts almost all of it, and a small fraction becomes ethyl glucuronide (EtG) and ethyl sulfate (EtS) — water-soluble metabolites the kidneys excrete slowly. That is the whole reason EtG testing exists: probation, treatment and workplace-abstinence programmes use it precisely because it catches drinking long after a breath test would read zero. The “80-hour test” label needs its own warning, though. Eighty hours reflects sustained heavy drinking at a sensitive cutoff. After one or two drinks, most people fall below the standard cutoff within 24 to 48 hours — so the window is a range that moves with the amount drunk, not a deadline anyone can count on.
Cutoffs decide what counts as positive
Laboratories report EtG against a cutoff, commonly 100, 250 or 500 ng/mL, and the cutoff changes the window: a lower cutoff reaches further back and catches lighter drinking, a higher one flags mainly heavier, more recent drinking. That sensitivity has a cost. Incidental exposure to alcohol in everyday products — mouthwash, hand sanitiser, some cough medicines and foods — can produce low EtG levels, which is why published lab guidance recommends a 500 ng/mL cutoff to reduce false positives from incidental exposure, and advises against using an EtG result alone as the sole basis for a legal or disciplinary decision. A low positive is evidence that alcohol was ingested or encountered, not a measure of how much was drunk.
Hair says pattern, not occasion
Hair testing works in the opposite direction from every other test here. It cannot show last night’s drinking at all in any useful sense, and it cannot date an occasion inside its window. What it shows is a pattern of regular or heavy use over weeks to months, which is why it appears in custody, probation and employment screening where long-term history matters more than recent use. Anyone facing a hair test who drank once, weeks ago, and anyone facing an EtG test who drank heavily days ago are in opposite positions — the test type, not the calendar alone, decides what is visible.
The practical reading
Three sentences cover most real situations. First, a zero BAC estimate means ethanol has left the blood on the model’s maths — it does not mean every test would come back empty. Second, a negative breath test the morning after says nothing about an EtG test later that week. Third, if a test genuinely matters — for work, court or a programme — the only reliable strategy is time measured in days for EtG and weeks to months for hair, never the hours on a BAC timeline. And none of this changes the driving rule: detection windows are about tests, and the decision not to drive after drinking stands regardless of which test would or would not catch it.
Morning-after arithmetic: worked examples
All four examples use the same Widmark maths as the calculator, at the average elimination rate of 0.015 per hour, with drinks counted as 14 g of pure alcohol each. They are estimates about average bodies, in exactly the sense the estimate-limits box in the results explains.
| Person and drinks | Peak BAC | Time to an estimated zero | What it means |
|---|---|---|---|
| Man, 180 lb, 2 beers (28 g) | 0.050 | 3.4 hours | Even two drinks take most of an evening to clear on the model. |
| Woman, 150 lb, 2 glasses of wine (28 g) | 0.075 | 5.0 hours | The same alcohol reads higher: less body water to spread it through (r = 0.55 against 0.68). |
| Man, 200 lb, 6 beers (84 g) | 0.136 | 9.1 hours; below 0.08 at about 3.7 hours | Crossing below 0.08 is a legal milestone in many places, never a statement that driving is safe. |
| Man, 180 lb, 8 beers (112 g) | 0.202 | 13.4 hours | Drinking that ends at midnight is still modelled as clearing well into the next afternoon — the classic morning-after trap. |
Check the second row by hand: 150 lb is 68.0 kg, so 28 / (68.0 × 1000 × 0.55) × 100 = 0.075, and 0.075 / 0.015 = 5.0 hours. The fourth row is the one to remember: 112 / (81.6 × 1000 × 0.68) × 100 = 0.202, and 0.202 / 0.015 = 13.4 hours. Anyone who drank eight beers and slept eight hours would wake, on this model, still carrying an estimated BAC around 0.08 — feeling rested, possibly feeling fine, and still over the limit most places set. Feeling fine after sleep is the morning-after version of feeling fine at the table: it measures rest and tolerance, not blood alcohol.
The elimination-rate range, on the default example
The calculator’s default — a man of 180 lb after four beers, peak 0.101 — clears at very different times depending on β, which is why the results always print the range rather than a single time:
| Elimination rate β | Time from the peak to an estimated zero | Who it resembles |
|---|---|---|
| 0.010 per hour (slowest common rate) | 10.1 hours | Slower clearers, including some people with liver disease |
| 0.015 per hour (average) | 6.7 hours | The published average used in most examples |
| 0.025 per hour (fastest common rate) | 4.0 hours | Regular heavy drinkers, whose enzymes clear faster |
Planning around the fastest figure is planning to be wrong in the dangerous direction. The cautious reading — the one this page recommends in its results — is the slowest figure, plus a margin for pours that were stronger than counted.
Why the estimate can be wrong, and by how much
A Widmark estimate is honest only when its error bars are printed next to it. Here are the five places this page’s figure can depart from a real blood alcohol level, and the direction each one pushes.
1. Absorption is not instant
The model treats the peak as if all the alcohol were absorbed the moment drinking started. In reality the peak arrives 30 to 90 minutes after the last drink, so early readings here run high and readings just after a final drink run low. The whole timeline is approximate, shifted by up to an hour or so — which matters most exactly when someone is tempted to use it as a countdown.
2. Pours are rarely standard
The presets assume exactly 12 oz at 5%, 5 oz at 12% and 1.5 oz at 40%. A pint of 7% craft beer is 16 oz × 7% × 23.33 g per fluid ounce of pure alcohol = 26.1 g, or about 1.9 standard drinks — nearly double the beer preset. A generous home wine pour is commonly one and a half standard drinks. Every under-counted drink adds roughly an hour and a half to the true clearance time at the average rate, and the error always runs toward underestimating, never overestimating, because nobody pours short by accident as often as they pour long.
3. Bodies are not averages
The r factors (0.68 men, 0.55 women) are population averages. Body composition, age and some medications move an individual’s real figure in either direction, and the same is true of β, which spans 0.010 to 0.025 across the population — a two-and-a-half-fold range in clearance time for the same peak. Two people with the same weight, sex and drinks can therefore honestly differ by hours in their true zero time.
4. Tolerance masks impairment without lowering BAC
A regular drinker may feel and appear far less impaired than their BAC implies, because tolerance dulls the felt effects without lowering the level in the blood at all. Reaction time and judgement are measurably worse well below 0.08, and people are poor judges of their own impairment at exactly the levels where it matters. Add tiredness — which genuinely impairs driving and feels much like mild drunkenness — and the self-assessment this page refuses to give becomes doubly unreliable.
5. Legal limits are lines, not safety thresholds
The 0.08 and 0.05 milestones are shown because people ask for them. Most US states set 0.08 for drivers over 21, Utah sets 0.05, commercial drivers face 0.04, and drivers under 21 face zero-tolerance rules in most states; many other countries use 0.05 or 0.02, and some drivers face a zero limit. Impairment begins with the first drink, below every one of those lines. That is why this page prints times and estimates but never a verdict that anyone is safe to drive: there is no honest version of that verdict a calculator can give, at 0.08, at 0.05, at 0.02, or at an estimated 0.00.
Going deeper
In 1932 the Swedish researcher Erik Widmark published the first practical method for estimating blood alcohol from how much a person drank. His insight was that alcohol, once absorbed, mixes into the body’s water rather than its fat or bone. Divide the alcohol by the water it spreads through and you get a concentration — but bodies are not beakers, so Widmark measured the relationship in volunteers and captured it in the factor r: about 0.68 for men and 0.55 for women, reflecting the higher average water share of male bodies. Courts and researchers have used his equation, with refinements, ever since.
The second half of the model is elimination. Unlike absorption, which is fast and messy, elimination is strikingly orderly: the liver’s enzymes work at full capacity whenever alcohol is present, so the level falls by a near-constant amount per hour — β, averaging about 0.015 g/dL per hour. Regular heavy drinkers can clear faster (up to roughly 0.025), people with liver disease slower (toward 0.010), which is why this page treats β as a dial and prints the range rather than pretending one rate fits everyone. Modern forensic practice runs Widmark backwards — measuring a known BAC and reconstructing the earlier one — and it is trusted precisely because both halves of the model are so simple that their limits are easy to state, as the assumptions box above does.
The question this page is named for has two different answers. Alcohol itself — the molecule a breath test measures — clears on the timeline above: it is gone from blood and breath once BAC reaches zero, and saliva tracks blood closely. But laboratories rarely test for alcohol itself. Urine tests usually target its breakdown products, ethyl glucuronide (EtG) and ethyl sulfate (EtS), which linger far longer — commonly one to three days after drinking, and up to about 80 hours after heavy drinking in some studies. Hair testing reaches back furthest of all: alcohol markers can be found in hair for up to roughly 90 days, though they say nothing about when, or how much, beyond a broad pattern.
Those windows are wide ranges, not deadlines — they stretch with the amount drunk and shrink with sensitive cut-off levels — and none of them works in reverse: a detectable EtG result cannot tell anyone your BAC at some earlier moment. What matters for everyday decisions is simpler. A zero BAC estimate means the alcohol has left your blood, not that every trace has left your body, and never that impairment, fatigue or a hangover has lifted with it. If a test matters to you — for work, court or a programme — the only reliable strategy is time measured in days, not a calculator’s hours.
Detection windows: the table readers actually need
Blood alcohol clears in hours, but detection does not end when BAC reaches zero. Breath and blood tests measure alcohol currently present (roughly 12–24 hours), standard urine tests cover a similar span, EtG metabolite urine tests extend to 24–48 hours after moderate drinking and up to about 80 hours after heavy drinking, and hair tests cover up to 90 days. The test type, not just the drinking, decides the window — a question like “how long does it stay in my system?” has no single answer until you say which test you mean.
That distinction is also why a positive EtG result with a zero breath result is not a contradiction: the breath test asks “are you impaired now?”, the EtG test asks “did you drink in the last few days?”, and the hair test asks “have you been drinking regularly for months?” Each is a different question, and each is used for a different purpose.
The morning-after risk, in numbers
The most dangerous misunderstanding about alcohol clearance is the belief that sleep resets it. It does not: the liver clears about 0.015% BAC per hour whether you are awake or asleep. A BAC of 0.18% at 2 a.m. is still about 0.06% at 10 a.m. — close to legal limits in many places and well within the range of real impairment. Anyone who drank heavily should assume the next morning is not automatically safe to drive, and should wait out the full estimated clearance time plus a margin.
Frequently asked questions
How long does alcohol stay in your system?
For blood alcohol itself, it depends on how much you drank and how fast you clear it. The body eliminates roughly 0.015 BAC points per hour, so each standard drink takes about an hour and a half to clear from a standing start: four drinks need around 6 to 7 hours to reach zero for an average man of 180 lb, while the same maths gives about 8 hours for three drinks in a woman of 140 lb. Slow clearers can take half as long again. Alcohol’s breakdown products stay detectable far longer — one to three days in urine, up to about 90 days in hair — long after the blood level itself is zero.
What counts as one standard drink?
In the United States, a standard drink is any drink holding about 14 grams (0.6 fluid ounces) of pure alcohol. That works out to a 12 oz beer at 5%, a 5 oz glass of wine at 12%, or a 1.5 oz shot of spirits at 40% — three very different glasses that carry the same alcohol. The catch is pours: a pint of 7% craft beer is closer to two standard drinks, and a generous home pour of wine can be one and a half. This calculator’s custom option exists for exactly those cases.
Can coffee, food, water or a shower sober me up faster?
No. Only time lowers blood alcohol, because the liver eliminates it at a near-constant rate that none of those things changes. Coffee and a cold shower can make a person feel more alert, which is its own hazard — feeling awake is easily mistaken for being sober. Food helps only before or during drinking, by slowing absorption and lowering the peak a little; eaten afterwards, it does nothing to the alcohol already in your blood. Water is still worth drinking — alcohol dehydrates — but it dilutes nothing in your bloodstream.
Why do the same drinks affect women more than men?
Mostly body water. Alcohol distributes through water, and women’s bodies carry a lower share of water and a higher share of fat than men’s at the same weight — captured in the Widmark factor r, 0.55 for women against 0.68 for men. The same 42 grams of alcohol therefore dissolves in less water and reaches a higher concentration. Women also tend to have less of the stomach enzyme that breaks down a first portion of alcohol before it reaches the blood. The result, at equal weights and equal drinks, is a BAC roughly a fifth to a quarter higher.
This says I am below the limit — can I drive?
No calculator can tell you that, and this one will not try. The figure here is an estimate built on population averages: your real level may be higher, the drinks may have been stronger than entered, and impairment to judgement and reaction time begins well below every legal limit — tiredness and alcohol together make it worse. Legal limits also vary: many countries use 0.05 or 0.02, and some drivers face a zero limit. If you have been drinking, the safe and simple rule is not to drive at all — take a taxi or rideshare, ride with a sober driver, or wait until tomorrow.
What BAC level is actually dangerous?
Danger climbs steeply. Around 0.15, balance, speech and judgement are severely impaired and vomiting is common. From about 0.30, there is a real risk of unconsciousness and alcohol poisoning; around 0.40 and above, coma and death from stopped breathing become possible, especially if the level was reached quickly. Tolerance shifts these lines for individuals but never removes them. If someone is hard to wake, breathing slowly or with long pauses, cold or pale, or vomiting while unconscious, call your local emergency number immediately and keep them on their side — do not wait for them to sleep it off.
How long does alcohol show on a breath test compared with a urine EtG test?
A breath test typically detects alcohol for about 12 to 24 hours, because it measures ethanol itself, which clears with the blood alcohol level. A urine EtG test measures a metabolite instead, and typically detects drinking for 24 to 72 hours, up to about 80 hours after heavy drinking — after light drinking of one or two drinks, most people fall below the standard cutoff within 24 to 48 hours. That gap is why a clear breath result in the morning says nothing about an EtG test later in the week, and why the detection-windows section above treats each test separately.
Can a hair test show a single night of drinking?
No, not in any useful sense. Hair testing detects EtG trapped in the hair shaft over roughly 90 days for a standard 1.5-inch sample, and it shows a pattern of regular or heavy use rather than a single occasion. It cannot date an occasion inside that window, and it says almost nothing about last night specifically. It is used where long-term history matters — custody, probation and employment screening — not where recent drinking is the question.
How long after drinking should I wait before driving?
Do not use a calculator, this one included, to answer that question for a real journey. The only safe rule after drinking is not to drive at all — take a taxi or rideshare, ride with a sober driver, or wait until the following day. If you are planning ahead rather than deciding tonight, plan around the slowest elimination rate and the following day, not the fastest figure, and remember that even an estimated 0.00 is a Widmark estimate about an average body, not a verdict that anyone is sober, rested or legally permitted to drive. Impairment to judgement and reaction time begins well below every legal limit.
Does drinking water, eating or exercising flush alcohol out faster for a test?
No. Only time lowers blood alcohol, because the liver eliminates it at a near-constant rate that water, food, exercise, coffee and cold showers do not change. Drinking a lot of water may dilute a urine sample, but laboratories check for dilution and some programmes treat a diluted sample as a failed test — and dilution does nothing to EtG, which is a metabolite, not the alcohol itself. Eating before or during drinking can slow absorption and lower the peak a little; eaten afterwards, it does nothing to the alcohol already in your blood.
How long can a urine EtG test detect alcohol?
Typically 24–48 hours after moderate drinking, and up to about 80 hours after heavy drinking — much longer than a breath test, because EtG is a metabolite that lingers after the alcohol itself is gone.
Does sleeping sober you up faster?
No. The liver eliminates alcohol at about 0.015% BAC per hour regardless of sleep. Sleep helps you feel better but does not accelerate clearance.
Can coffee or water help me pass a breath test?
No. Neither changes blood alcohol concentration. Coffee may make you feel more alert while still impaired, which is more dangerous, not less.
Is a hair test able to show one night of drinking?
No. Hair testing reflects a pattern of use over the months covered by the hair segment tested (about 90 days for a standard sample), not a single occasion.
Built on the Widmark formula with its assumptions printed — because a timeline you cannot retrace is just a guess wearing a lab coat.