BMI Calculator for Women
Your body mass index by World Health Organization ranges and, if you like, your waist size. No “ideal weight” and no weight-loss advice — just the number and what it can and can’t tell you.
How BMI is calculated
Body mass index = weight in kilograms ÷ height in meters squared (or 703 × pounds ÷ inches squared). WHO ranges for adults: under 18.5 — underweight; 18.5–24.9 — healthy range; 25–29.9 — overweight; 30 and above — obesity. For adults they don’t change with age or sex.
What BMI misses
BMI can’t tell muscle from fat or show where fat is carried, and it doesn’t apply during pregnancy or breastfeeding, for athletes or for anyone under 18. The WHO suggests lower cut-offs for people of Asian descent. It’s a starting point for a conversation with your doctor — not a verdict on your health, and never on you.
Waist size adds context: according to the WHO, a waist over 80 cm (31.5 in) in women is linked to increased metabolic risk, and over 88 cm (34.6 in) to substantially increased risk.
If thoughts about food and weight feel heavy
If the number on the scale strongly affects your mood, you restrict food or feel guilty after eating, please talk to a doctor or therapist. In the US, the National Alliance for Eating Disorders offers free support. You deserve care at any size.
How we calculate
BMI = weight (kg) ÷ height (m)², or 703 × pounds ÷ inches². WHO adult ranges: < 18.5; 18.5–24.9; 25–29.9; ≥ 30. Waist in women: > 80 cm (31.5 in) increased risk, > 88 cm (34.6 in) substantially increased.
Everything runs in your browser: the numbers you enter are not sent or saved anywhere.
One step
Sleep matters too — see when to go to bed with the sleep calculator.
Common questions
What is a healthy BMI for women?
For adults, the WHO healthy range is 18.5–24.9 — the same for women and men.
Does a healthy BMI change with age?
Not for adults 18 and older. Children and teens are assessed with age-based charts.
Is BMI accurate during pregnancy?
No. During pregnancy, follow your provider’s guidance.
A magazine calculator for self-reflection. It doesn’t diagnose anything and doesn’t replace advice from your doctor.
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