WHO classification
BMI calculator
Enter your height and weight to see your body mass index, which range it falls in, and the weight range considered healthy for your height.
Your BMI
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Where you sit
- Underweight
- Healthy
- Overweight
- Obese
Healthy weight for your height
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This is the weight range that would put your BMI between 18.5 and 24.9.
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How BMI is calculated
BMI is your weight in kilograms divided by the square of your height in metres (kg/m²). The adult cut-offs used here are the World Health Organization's: under 18.5 is underweight, 18.5 to 24.9 is healthy, 25 to 29.9 is overweight, and 30 and above is obese.
What BMI doesn't tell you
BMI only knows your height and weight, so it cannot tell muscle from fat or say where that weight sits on your body. A muscular athlete can read as overweight while being perfectly healthy, and someone with a normal BMI can still carry a lot of abdominal fat. It is also not meaningful for children, during pregnancy, or for some ethnic groups whose risk thresholds differ. Treat it as one rough signal among several, not a verdict.
Frequently asked questions
What is a healthy BMI?
For adults, the World Health Organization puts the healthy range at 18.5 to 24.9. Below 18.5 counts as underweight, 25 to 29.9 as overweight, and 30 or more as obese. The ranges are the same for men and women.
How do I calculate BMI myself?
Divide your weight in kilograms by your height in metres squared. Someone who is 1.75 m and 70 kg has a BMI of 70 ÷ (1.75 × 1.75) = 22.9. In pounds and inches, multiply weight in pounds by 703 and divide by height in inches squared.
Is BMI accurate for athletes?
Often not. BMI cannot distinguish muscle from fat, so a well-trained athlete with low body fat may land in the overweight or even obese range. If you carry a lot of muscle, waist measurement or a body-fat estimate will tell you more.
Does BMI differ for men and women?
The formula and the cut-offs are identical. Women do typically carry more body fat than men at the same BMI, which is one of the reasons BMI is a rough screening tool rather than a measure of body composition.