For women
BMI Calculator for Women
Enter your height and weight to see your BMI, your weight category, and the healthy weight range for your height — with context written specifically for women.
Is the healthy BMI range different for women?
The World Health Organization uses the same adult BMI categories for women and men: under 18.5 is underweight, 18.5–24.9 is a healthy weight, 25–29.9 is overweight, and 30 or above is obesity. However, women naturally carry a higher percentage of body fat than men at the same BMI, so two people with identical scores can have very different body compositions.
Life stages that change the picture
Pregnancy and breastfeeding make BMI unreliable — weight gain is expected and healthy, so don't use this calculator during pregnancy. After menopause, many women lose muscle and bone density, which means BMI can stay in the 'healthy' band while body fat rises. If you're over 50, treat your result as one signal among several rather than a verdict.
Why waist size matters alongside BMI
Where you carry weight matters as much as how much you weigh. Fat stored around the waist is linked to higher risk of heart disease and type 2 diabetes than fat on the hips and thighs. Health guidelines flag a waist measurement above 80 cm (about 31.5 inches) for women as increased risk, and above 88 cm (35 inches) as high risk — even when BMI looks fine.
Using your result sensibly
If your BMI falls outside the healthy range, it's a prompt for a conversation with your doctor, not a reason to crash-diet. Gradual changes — regular movement you enjoy, enough protein to protect muscle, and consistent sleep — move the needle far more reliably than short-term restriction.
Key facts about BMI
The WHO adult BMI categories are identical for women and men — but because women carry more essential body fat, the CDC's adult guidance recommends reading the number alongside waist size and life stage.
Adult BMI categories
How BMI is read by age group
| Group | How it's assessed | Healthy / lowest-risk |
|---|---|---|
| Children & teens (2–19) | BMI-for-age percentile, by sex | 5th to under 85th percentile |
| Adults (20–64) | Fixed adult bands | 18.5 – 24.9 |
| Older adults (65+) | Adult bands, interpreted with care | Lowest risk seen around 23 – 29.9 |
| Asian adults | Lower action points suggested | 18.5 – 22.9 (risk rises from 23) |
Children's results use CDC BMI-for-age growth charts. A meta-analysis of 32 studies in adults over 65 found the lowest mortality at BMI 23–29.9, and a WHO expert consultation published in The Lancet recommended lower action points for Asian populations.
Limitations of BMI
- It doesn't measure body fat. In a study of over 13,000 adults, BMI ≥30 missed about half of people with excess body fat.
- Muscle counts as weight. Athletes can score "overweight" while lean.
- Fat location matters. Belly fat carries more risk; waist-to-height ratio predicts heart and metabolic risk better than BMI. Aim for a waist under half your height.
- Age, sex and ethnicity change the picture, as the table above shows.
- Not for pregnancy or people with major fluid shifts or amputations.
Even so, large studies such as the Global BMI Mortality Collaboration (10.6 million adults) confirm BMI is a useful population-level screening tool. Use it as a starting point and discuss results with a health professional.
Frequently asked questions
What is a healthy BMI for a woman?
The WHO healthy range of 18.5–24.9 applies to adult women and men alike. Because women carry more essential body fat, some clinicians also look at waist size and body composition alongside BMI.
Can I use this calculator while pregnant?
No. Weight gain during pregnancy is expected and healthy, so BMI categories don't apply. Your midwife or doctor will track pregnancy weight gain against separate guidelines.
Does BMI account for muscle?
No. BMI only compares weight to height, so muscular women can score 'overweight' with low body fat. If you strength-train regularly, waist measurement or body-fat percentage gives a clearer picture.
Is my information stored?
No. The calculation runs entirely in your browser — your height and weight never leave your device.