BMI Calculator for Women
Check your body mass index in seconds. Enter your height and weight and get your BMI, category and healthy weight range instantly, using either the WHO or the Asian / Indian standard.
Your BMI will appear here instantly.
How to use this calculator
- Pick your units. Use metric (cm and kg) or imperial (feet, inches and pounds). The tool converts for you.
- Enter your height and weight. Your BMI, category and BMI Prime appear immediately.
- Choose a standard. The international WHO scale is used worldwide. The Asian / Indian scale uses lower cut-offs because health risks tend to appear at lower BMI values in South and South-East Asian populations.
- Add your age (optional). If you are under 18, adult categories do not apply and the tool will tell you so.
Your healthy weight range and the amount to gain or lose to reach it are shown below the result. Treat these as a starting point for a conversation with your doctor, not as a target to chase.
What BMI is and how it is calculated
Body mass index is a simple ratio between your weight and your height. It was designed as a quick way to screen large groups of people for weight-related health risks, and it is still the most common first check used by doctors and public health bodies.
Worked example: a woman who weighs 60 kg and is 1.60 m tall has a BMI of 60 ÷ (1.60 × 1.60) = 60 ÷ 2.56 = 23.4. In imperial units the formula is BMI = 703 × weight (lb) ÷ height (in)².
BMI does not measure body fat directly and it was never meant to diagnose anything. Its strength is that it is quick, free and needs no equipment.
BMI categories for women
Adult women use the same BMI cut-offs as men. The table shows both the international WHO scale and the lower Asian / Indian cut-offs.
| Category | WHO (international) | Asian / Indian |
|---|---|---|
| Underweight | Below 18.5 | Below 18.5 |
| Normal weight | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight | 25.0 – 29.9 | 23.0 – 24.9 |
| Obese | 30.0 and above | 25.0 and above |
BMI Prime explained
BMI Prime divides your BMI by the upper limit of the normal range. A value of 1.0 means you are right at that limit. Below 1.0 you are inside the normal range or under it, and above 1.0 you are over it.
For example, a BMI of 27.5 on the WHO scale gives a BMI Prime of 27.5 ÷ 25 = 1.10, meaning you are about 10% above the upper limit. Many people find this easier to read than the raw BMI because the answer to “am I in range?” is built into the number. This calculator uses 25 as the limit for the WHO scale and 23 for the Asian / Indian scale.
BMI chart for women by height
This table shows the healthy weight range for common heights. It follows the standard you selected in the calculator above.
| Height | Healthy weight (kg) | Healthy weight (lb) |
|---|
Why women’s BMI needs extra context
The formula is identical for everyone, but bodies are not. On average, women carry a higher share of body fat than men at the same BMI, and fat tends to be stored differently, often around the hips and thighs rather than the abdomen. Hormonal changes across life also matter.
Pregnancy and breastfeeding
BMI is not a valid measure during pregnancy. Doctors use your pre-pregnancy BMI as a reference to guide healthy weight gain. If you are pregnant or have recently given birth, follow your doctor’s advice rather than this tool.
PCOS and thyroid conditions
Conditions such as polycystic ovary syndrome and thyroid disorders can influence weight and body composition. BMI is still a useful screen, but a medical assessment gives a far better picture.
Menopause and ageing
After menopause, many women lose muscle and gain abdominal fat even when their weight barely changes. For this reason, waist measurement becomes a valuable partner to BMI. A waist-to-height ratio under 0.5 is generally seen as favourable.
Limits of BMI
- It cannot tell muscle from fat, so strong, athletic women may score as overweight.
- It ignores where fat is stored, which affects health risk.
- It may overestimate health in older adults who have lost muscle.
- Adult cut-offs do not apply to children and teenagers, who are assessed on age and sex growth charts.
Use BMI together with waist size, blood pressure, blood sugar and cholesterol results, activity level and family history for a rounder view of your health.
Habits that support a healthy weight
- Eat mostly whole foods: vegetables, fruit, pulses, whole grains and enough protein.
- Move regularly: aim for around 150 minutes of moderate activity a week, plus two days of strength training.
- Sleep 7 to 9 hours: poor sleep disrupts hunger hormones.
- Manage stress: long-term stress can drive overeating and abdominal fat.
- Get regular check-ups: iron, vitamin D, thyroid and blood sugar tests are especially useful for women.
If your BMI is below the healthy range, focus on nutrient-dense meals and speak to a doctor to rule out underlying causes. Crash diets are not recommended at any BMI.
FAQs
What is a healthy BMI for women?
For adult women, 18.5 to 24.9 is healthy on the WHO scale. On the Asian / Indian scale the healthy range is 18.5 to 22.9.
Is a BMI of 20 too low for a woman?
No. A BMI of 20 sits comfortably inside the healthy range, on the leaner side.
Is a BMI of 23 good for a woman?
On the WHO scale it is healthy. On the Asian / Indian scale it falls just into the overweight band, so keeping an eye on waist size and lifestyle is sensible.
How do I calculate BMI for women?
Divide your weight in kilograms by your height in metres squared. Compare the result with the category table above.
Is BMI different for women and men?
The formula and cut-offs are the same. Women usually carry more body fat at the same BMI, so BMI is best read alongside waist size and other health markers.
Can I use this calculator during pregnancy?
No. BMI is not valid in pregnancy. Ask your doctor about healthy weight gain.
Does BMI work for teenage girls?
Not with adult cut-offs. For girls under 18, BMI is compared with age and sex percentile charts by a doctor.
Related calculators
Sources
- Nuttall FQ. Body Mass Index: Obesity, BMI, and Health: A Critical Review. Nutrition Today, 2015.
- WHO Europe. Body mass index – BMI.
- Tauqeer Z, Gomez G, Stanford FC. Obesity in Women: Insights for the Clinician. Journal of Women’s Health, 2018.
Disclaimer: this calculator provides general information only and is not a substitute for professional medical advice, diagnosis or treatment. Always consult a qualified doctor or registered dietitian about your health.