BMI Calculator for Women – BMI, Body Fat and Waist-to-Hip Ratio
Your BMI tells only part of the story. This calculator gives the full picture for women: BMI with healthy bands, estimated body-fat percentage, and your waist-to-hip ratio — in metric or imperial, in seconds.
Your measurements
Pick your unit system.
Advanced options — waist & hip measurements
Waist and hip measurements are already included in the result with their default values — open Advanced options to change them.
- BMI alone can mislead — this calculator adds a Deurenberg body-fat estimate and your waist-to-hip ratio, with 0.85 as the healthy line for women.
- At the defaults — 165 cm, 65 kg, age 30 — BMI is 23.88, in the healthy weight band.
- For ages 2–19 the adult bands step aside for CDC BMI-for-age percentiles, worked out from exact age in years and months.
Your BMI tells only part of the story. This calculator gives the full picture for women: BMI with healthy bands, estimated body-fat percentage, and your waist-to-hip ratio — in metric or imperial, in seconds.
People search for this tool under half a dozen names — a female BMI calculator, a womens BMI calculator, a women BMI calculator, a bmi women calculator — and every one of them lands here: this women’s BMI calculator works out your BMI, an estimated body-fat percentage and your waist-to-hip ratio from one set of measurements. The guide below gives those numbers their full context: a complete BMI chart for women with the boundaries computed from the formula, how the healthy band should be read at different ages, the waist-to-height check, and an honest account of what BMI misses in women.
Why three numbers beat one
BMI alone can mislead — muscle, bone structure and fat distribution all matter. Here is what each metric adds.
BMI (kg ÷ m²) screens weight relative to height — fast, standard, but blind to muscle versus fat. A very athletic woman can score “overweight” while being very fit.
Body fat % uses the Deurenberg formula for women: 1.20 × BMI + 0.23 × age − 5.4. It is an estimate, not a scan — but it adjusts for the fact that two women with the same BMI can carry very different amounts of fat.
Waist-to-hip ratio (waist ÷ hip) captures where fat sits. Research links ratios below 0.85 in women to lower health risk, because abdominal fat is the type most tied to metabolic issues.
More health tools to try
Handy calculators for weight, nutrition and cycles.
How to check your numbers
Three steps, instant answers.
Height, weight, waist and hip — tape measure, morning, relaxed.
Metric or imperial — the toggle converts instantly.
BMI band, body-fat estimate and waist-to-hip ratio together.
BMI chart for women: healthy weight by height
The full healthy range for every height — every boundary computed from the formula, none copied from another chart.
A BMI chart is the calculator’s arithmetic, printed in advance. For any height, the healthy weight range is the pair of weights that produce a BMI of 18.5 and 24.9 — the bottom and top of the CDC’s healthy band for adults — worked out from weight = BMI × height². This bmi women chart runs from 4’9″ to 6’3″ and gives the range in kilograms and pounds side by side, so you can read your row in whichever units you weighed yourself in. Every boundary in the table was recomputed from the formula for this page and spot-checked against the calculator above: enter a boundary weight at its height and the tool returns a BMI within a rounding step of 18.5 or 24.9.
| Height | Height (cm) | Healthy weight (kg) | Healthy weight (lb) |
|---|---|---|---|
| 4’9″ | 145 cm | 38.8 – 52.2 kg | 85.5 – 115.1 lb |
| 4’10” | 147 cm | 40.2 – 54.0 kg | 88.5 – 119.1 lb |
| 4’11” | 150 cm | 41.5 – 55.9 kg | 91.6 – 123.3 lb |
| 5’0″ | 152 cm | 43.0 – 57.8 kg | 94.7 – 127.5 lb |
| 5’1″ | 155 cm | 44.4 – 59.8 kg | 97.9 – 131.8 lb |
| 5’2″ | 158 cm | 45.9 – 61.8 kg | 101.1 – 136.1 lb |
| 5’3″ | 160 cm | 47.4 – 63.8 kg | 104.4 – 140.6 lb |
| 5’4″ | 163 cm | 48.9 – 65.8 kg | 107.8 – 145.1 lb |
| 5’5″ | 165 cm | 50.4 – 67.9 kg | 111.2 – 149.6 lb |
| 5’6″ | 168 cm | 52.0 – 70.0 kg | 114.6 – 154.3 lb |
| 5’7″ | 170 cm | 53.6 – 72.1 kg | 118.1 – 159.0 lb |
| 5’8″ | 173 cm | 55.2 – 74.3 kg | 121.7 – 163.8 lb |
| 5’9″ | 175 cm | 56.8 – 76.5 kg | 125.3 – 168.6 lb |
| 5’10” | 178 cm | 58.5 – 78.7 kg | 128.9 – 173.5 lb |
| 5’11” | 180 cm | 60.2 – 81.0 kg | 132.6 – 178.5 lb |
| 6’0″ | 183 cm | 61.9 – 83.3 kg | 136.4 – 183.6 lb |
| 6’1″ | 185 cm | 63.6 – 85.6 kg | 140.2 – 188.7 lb |
| 6’2″ | 188 cm | 65.4 – 88.0 kg | 144.1 – 193.9 lb |
| 6’3″ | 190 cm | 67.1 – 90.4 kg | 148.0 – 199.2 lb |
How to read your row. Find your height, then compare your weight with the range beside it. Inside the range, your BMI sits in the healthy band; below it, underweight; above it, overweight — and 30.0 or higher is the obesity band, with classes at 30, 35 and 40. A worked read: a woman who is 5’4″ and weighs 140 lb sits inside her row’s range of 107.8 – 145.1 lb, so her BMI is in the healthy band — the calculator gives 24.0. At 150 lb she would be just over the top of the row, at a BMI of 25.7. The chart and the calculator are the same method at two speeds: the chart shows every height at once, the calculator adds your body-fat estimate and waist-to-hip ratio to the answer.
The age layer. Read as a female age BMI chart, the table carries a second fact: the healthy range does not change across the age bands. The CDC publishes one adult band — 18.5 to 24.9 — for a woman of 25 and a woman of 65 alike. What changes with age is not the band but the body behind a given number: at the same BMI of 25, a woman’s typical body-fat percentage rises from about 33% in her twenties and thirties to about 38% in her sixties and seventies (Gallagher et al., American Journal of Clinical Nutrition, 2000), because muscle is gradually replaced by fat at the same weight. The next section takes that up in full.
| Age band | Healthy BMI range (CDC — all adult ages) | Typical body fat at a BMI of 25 (Gallagher et al., 2000) |
|---|---|---|
| 20–39 | 18.5 – 24.9 | ≈ 33% |
| 40–59 | 18.5 – 24.9 | ≈ 35% |
| 60+ | 18.5 – 24.9 | ≈ 38% |
One caution the women’s BMI chart cannot show: it is built from the standard adult formula, so it describes adult women. It is a screening table, not a diagnosis — the sections below cover exactly where its rows should be read with care.
BMI by age for women: what changes, what doesn’t
One official band for every adult age — and a body that quietly changes behind the same number.
Start with the question most women actually ask: does the healthy number move as you get older? Officially, no. The CDC and the WHO publish a single set of adult bands — underweight below 18.5, healthy 18.5–24.9, overweight 25.0–29.9, obesity at 30.0 and above — with no age adjustment, and no official body publishes an age-specific “ideal” BMI for women. This page invents none. A bmi calculator for women with age built in, like the one above, uses your age only where age genuinely belongs: in the body-fat estimate, not in the band itself.
Average is not healthy. The average BMI for women in the United States sits well above the healthy band at every age. In the National Center for Health Statistics’ anthropometric report (NHANES measurements, 2015–2016), the measured average for US women was about 29 in the 20–39 group, 30.4 across the 40–69 span, and 29.7 at 70 and over. An average that high means the typical woman is in the overweight band — it describes the population, not a target. Being “about average” and being in the healthy range are different statements, and the second is the one with evidence behind it.
Ages 20–39. Composition is at its most favourable: muscle mass is near its peak, so a given BMI corresponds to the least body fat it ever will. This is also the band where the athlete caveat bites hardest — a trained woman can sit at 25 or 26 on muscle alone (the last section works an example). A bmi calculator female with age inputs makes the point numerically: the Deurenberg estimate this page uses adds 0.23 of a percentage point per year of age, so even its body-fat estimate assumes slow change underneath a steady BMI.
Ages 40–59, and the menopause-era shift. As oestrogen falls through the menopause transition, fat storage redistributes toward the abdomen and muscle mass begins to decline. The scale may not move — and the BMI may not move — while the waist grows and body fat rises. The arithmetic is stark: at a fixed BMI of 25, the Deurenberg formula estimates body fat at 31.5% for a woman of 30, 36.1% at 50 and 40.7% at 70. Gallagher and colleagues’ independent body-composition data tell the same story in measured tissue: about 33%, 35% and 38% across the same span. Two different methods agree on the direction and roughly on the size: a BMI that meant one thing at 30 means something softer at 55.
Ages 60+. Two further wrinkles. Height itself shrinks — an inch of lost height raises the BMI computed from the same weight by roughly 0.7 of a point, because height is the squared term — so measure your current height, not the one from your twenties. And researchers do debate whether the mortality-optimal BMI drifts upward in older adults; some cohort studies find the lowest risk a little above 25 after 65. That debate is real, but it is a research question, not a published band: the CDC’s healthy range stays 18.5–24.9, and any individual decision to aim above it belongs in a conversation with a doctor who can weigh muscle, waist and history alongside the index.
The practical reading: use the same band at every age, but trust it less alone as the decades pass — pair it with your waist measurement and the body-fat estimate, both of which this calculator already reports.
Waist-to-height ratio: the 0.5 check
One division — waist ÷ height — that catches the central fat BMI cannot see.
The calculator above reports your waist-to-hip ratio; this section adds its close cousin, the waist-to-height ratio, because the two checks fail in different places. The height waist ratio is exactly what its name says: your waist circumference divided by your height, in the same units. Its boundary is a single memorable number — 0.5. Keep your waist below half your height and the ratio is in the healthy zone; at or above 0.5, central fat is flagged whatever your BMI says. The rule comes from the work of Ashwell and Hsieh and is the form used in NICE guidance in the UK, precisely because one boundary serves every height, sex and most populations. You do not need a separate height to waist ratio calculator: the division takes seconds, and this waist to height ratio chart prints the line for common heights so you can compare your tape reading directly:
| Your height | Waist at the 0.5 line (cm) | Waist at the 0.5 line (in) |
|---|---|---|
| 150 cm | 75 cm | 29.5 in |
| 155 cm | 78 cm | 30.5 in |
| 160 cm | 80 cm | 31.5 in |
| 165 cm | 82 cm | 32.5 in |
| 170 cm | 85 cm | 33.5 in |
| 175 cm | 88 cm | 34.4 in |
| 180 cm | 90 cm | 35.4 in |
| 185 cm | 92 cm | 36.4 in |
Worked readings. A woman of 165 cm with a 70 cm waist has a ratio of 70 ÷ 165 = 0.42 — comfortably under the line. The same woman with an 84 cm waist reads 84 ÷ 165 = 0.51 — just over it, even though her BMI, if she weighs 65 kg, is a healthy 23.88. That gap is the entire reason the check exists. Used as a waist to height calculator, the table above works in reverse, too: find your height and the chart tells you the largest waist that keeps you under 0.5.
Measure it the WHO way. The ratio is only as honest as the tape reading behind it. The WHO protocol: find the midpoint between the lowest rib and the top of the hip bone, wrap the tape level around that point, snug against the skin without pulling in, and read at the end of a normal breath out, standing relaxed. A waist read over clothing, after a deep inhale, or at the navel when your midpoint sits higher can move a centimetre or two — and at the 0.5 line, a centimetre or two is the whole margin.
Waist size on its own. The WHO’s waist circumference bands for women (WHO report on waist circumference and waist–hip ratio, 2008) set 80 cm as the point where metabolic risk rises and 88 cm where it rises substantially — about 31.5 and 34.6 inches. These fixed lines and the 0.5 ratio usually agree; where they differ, it is at the height extremes, because a fixed 80 cm line is relatively stricter on a short woman and looser on a tall one, which the ratio corrects for.
When the checks disagree. Take a woman of 168 cm with an 84 cm waist and 104 cm hips. Her waist-to-hip ratio is 84 ÷ 104 = 0.81 — a pass against the 0.85 line this calculator uses. But her waist is over the WHO’s 80 cm risk line, and her waist-to-height ratio is exactly 0.50 — on the boundary. The hip measurement flatters her, because wide hips dilute the ratio while the abdominal fat it cannot see stays put. Read together, the three checks say: BMI for the overall screen, waist and waist-to-height for the fat that sits around the organs — the fat most tied to metabolic risk — and waist-to-hip as supporting evidence, never as an all-clear on its own.
What BMI misses in women
Pregnancy, muscle and age — the three places the index needs help, stated plainly.
Pregnancy. BMI and the body-fat formula are not valid during pregnancy, and this page says so without hedging: healthy gestational weight gain follows its own curves, set by pre-pregnancy BMI and trimester, and is a matter for your doctor or midwife. Do not use this calculator — or any BMI chart — to judge weight while pregnant, and treat any result from pregnancy-era measurements as a number without a meaning.
Muscle. BMI counts kilograms, not their composition. A strength-trained woman of 5’6″ weighing 155 lb scores a BMI of 25.0 — the first step of the “overweight” band — while carrying less fat than an untrained woman at 22. If you train seriously, read the body-fat estimate and your waist first and the BMI band second; the FAQ below puts numbers on the effect. Note that even the estimate cannot fully rescue the label: the Deurenberg formula is built from BMI and age, so it inherits part of the same blindness — a measured waist, or the Navy-method reading in the cross-check below, is the real tiebreaker.
Age. The mirror-image error: an older woman can hold a “healthy” 23 while carrying more fat than she did at the same BMI thirty years earlier, because muscle has quietly been replaced by fat and her measured height has shrunk. The previous section gives the estimates; the summary is that in later decades a healthy BMI is necessary context, not a clean bill of health — waist and body-fat readings carry the real information.
The cross-check that measures the fat itself. Where BMI estimates composition from height and weight, the Body Fat Calculator works from your actual neck, waist and hip tape measurements using the US Navy method, and shows both estimates side by side. Read together, the two pages give the honest range a single number hides. Companion tools in the same set: the general BMI Calculator for everyone, the BMI Calculator for Men, and the NHS BMI Calculator if you want the UK’s presentation of the same bands.
⚙️How women’s BMI and body fat are calculated
The standard BMI formula is the same for everyone — weight (kg) ÷ height (m)², or 703 × lb ÷ in² in imperial units. What differs for women is the interpretation: the body-fat estimate uses a female-specific formula, and the waist-to-hip healthy cutoff (0.85) is women’s own threshold.
Body fat % = 1.20 × BMI + 0.23 × age − 5.4
Waist-to-hip = waist ÷ hip · healthy below 0.85
Worked example: 65 kg, 165 cm → BMI = 65 ÷ 1.65² = 23.88 (healthy). At age 30 → body fat ≈ 1.20 × 23.88 + 0.23 × 30 − 5.4 = 30.16%. With waist 70 cm and hip 95 cm → WHR = 0.74, comfortably below the 0.85 healthy line. Imperial check: 150 lb at 65 in → 703 × 150 ÷ 65² = 24.96.
BMI cannot tell muscle from fat, so athletic women (dense muscle) and postmenopausal women (less muscle, more fat at the same weight) can both be misclassified. It also says nothing about fat distribution — which is exactly why this page adds body-fat % and waist-to-hip ratio. Treat BMI as a screening flag, not a diagnosis: if your BMI is high but your WHR is 0.74 and you train regularly, the number means far less.
Pregnancy note: BMI and body-fat formulas are not valid during pregnancy — weight gain follows its own healthy curves. Talk to your doctor or midwife instead of any calculator.
General ranges for women: athletes 14–20%, fit 21–24%, average 25–31%, and 32%+ typically classed as obese by body-fat standards. These differ from BMI bands because they measure composition, not weight. The Deurenberg estimate here is a population formula — a DEXA scan or calipers give a true measurement, but the estimate is a fine starting point for tracking trends over months.
Frequently asked questions
What is a healthy BMI for a woman?
The CDC’s healthy band for adult women is 18.5 to 24.9 — the same bands as for men. Below 18.5 is underweight, 25.0–29.9 is overweight, and 30.0 or above is obese. What differs for women is the context around the number: the body-fat estimate and waist readings this calculator reports alongside it.
Does a healthy BMI change with age for women?
Officially, no. The CDC and WHO publish one adult band — 18.5–24.9 — at every adult age, and no age-specific ideal exists. What changes is composition: at the same BMI of 25, typical body fat rises from about 33% in a woman’s twenties and thirties to about 38% in her sixties and seventies, so the same number deserves a waist and body-fat check as the decades pass.
What is a healthy weight for a 5’5″ woman?
Between 111.2 and 149.6 lb (50.4 – 67.9 kg). Those are the weights that give a BMI of 18.5 and 24.9 at 5’5″ (165.1 cm), computed from weight = BMI × height² — the first and last entries of her row in the chart on this page.
Is waist-to-height ratio better than BMI?
It answers a different question. BMI screens total weight for height; waist-to-height ratio (waist ÷ height, healthy below 0.5) catches central fat that BMI cannot see — a woman can hold a healthy BMI of 23.9 with a ratio of 0.51. Neither replaces the other; read together, with the waist circumference bands, they cover each other’s blind spots.
Can BMI be high because of muscle in women?
Yes. Muscle is denser than fat, so a trained woman can cross into the overweight band on lean mass alone: at 5’6″ and 155 lb the formula returns a BMI of 25.0 — “overweight” — even at an athletic body-fat percentage. If you strength-train, judge by the body-fat estimate and your waist first and the band second.
What waist measurement is healthy for a woman?
Under 80 cm (31.5 in) is the low-risk zone in the WHO’s bands for women; 80–88 cm marks increased metabolic risk and over 88 cm (34.6 in) substantially increased risk. The waist-to-height cross-check says the same thing in relative terms: keep your waist below half your height — below 0.5.
How is BMI calculated for women?
Exactly as for everyone: weight in kilograms divided by height in metres squared — or, in imperial units, 703 × pounds ÷ inches². Worked example from the calculator above: 65 kg at 165 cm gives 65 ÷ 1.65² = 23.88, inside the healthy band. The formula is unisex; only the interpretation around it is sex-specific.
What BMI is obese for a woman?
A BMI of 30.0 or above. The CDC splits obesity into class I (30.0–34.9), class II (35.0–39.9) and class III (40.0 and above). The threshold is identical for women and men; what a given obese-range BMI means for an individual still depends on waist, body composition and history.
Should I use BMI during pregnancy?
No. BMI and body-fat formulas are not valid during pregnancy — healthy weight gain follows its own curves by pre-pregnancy BMI and trimester. Use your pre-pregnancy BMI only as background, and take pregnancy weight questions to your doctor or midwife rather than to any calculator, this one included.
Why does my BMI differ from my body fat percentage?
Because they measure different things. BMI is an index of weight relative to height; body fat percentage is the share of that weight which is fat. The estimate here (the Deurenberg formula) adds age and sex to the BMI, which is why two women with the same BMI of 24 can be estimated at 29% and 36% body fat thirty years apart.
What is a healthy BMI for a woman over 50?
The same band as at every adult age: 18.5 to 24.9. Age does not change the BMI boundaries. What changes after 50 is the composition behind the number, so pair BMI with waist circumference, the body-fat estimate, and the trend of weight over time.
What is a healthy BMI for a woman over 60 or 70?
Still 18.5 to 24.9. After 60, height loss can inflate BMI and muscle loss can hide high fat inside a healthy band, so waist, strength, and weight stability matter as much as the number. Unintentional weight loss deserves clinical attention regardless of where BMI sits.
Does menopause change how BMI should be read?
It does not change the BMI bands, but falling oestrogen shifts fat toward the abdomen and accelerates bone loss, so waist measurement, strength, and bone health deserve more attention through the transition. Discuss any concerns with a clinician, rather than adopting a new target from a chart.
Are BMI cut-offs different for Asian women?
Several authorities use lower action points for Asian populations, overweight from 23.0 and obese from 27.5, with a waist threshold around 80 cm for Asian women. This calculator reports the global bands; add the regional context with a clinician familiar with your background.
Should I trust BMI or the body-fat estimate more?
Neither alone. BMI sorts weight against height; the body-fat estimate separates fat from lean mass, which is the distinction BMI cannot make. Read them together with waist circumference and trend, and let agreement between them carry more weight than any single figure.
BMI for older women: over 50, 60, and 70
The band is the same at every age. The composition behind it is not.
The healthy BMI band for women is 18.5 to 24.9 at every adult age, and the chart on this page needs no age adjustment. What changes across the 50s, 60s, and 70s is the composition behind a given BMI. Muscle mass declines progressively unless resistance training opposes it, fat distribution shifts toward the abdomen, and bone density falls, so a weight that has not moved in ten years can describe a body that has lost muscle and gained central fat in equal measure. The waist check catches what the scale hides: a waist-to-height ratio above 0.5, waist divided by height in the same units, marks central fat worth attention at any BMI, and a waist above 88 cm at the navel is the commonly used threshold for women in the general classification.
One life-course change deserves a single plain sentence: around the menopause, falling oestrogen shifts fat storage toward the abdomen and accelerates bone loss, which is why waist, strength, and bone health deserve more attention through the transition, with clinical guidance where appropriate, while the BMI arithmetic itself stays exactly the same. Regional criteria add a further variation for women of South Asian, East Asian, or Southeast Asian descent, with lower action points, overweight from 23.0 and obese from 27.5, and a waist threshold around 80 cm. After 60, height loss from spinal compression can inflate BMI computed from current height, so measure height carefully and read the trend of weight over years alongside any single result.
Related Health Calculators
Explore more useful health tools.
Classic BMI.
Daily needs.
Weight-loss targets.
Energy expenditure.
Fertile window.
The body fat figure on this page is estimated from your BMI (the Deurenberg formula) — a population average, not a measurement. The Body Fat Calculator works from your actual neck, waist and hip measurements using the US Navy method, and shows both estimates side by side so you can see the honest range.
Measure my body fat percentage →Related guides
Go deeper on the numbers this calculator gives you.