Enter your weight and height. BMI is a screening measure for adults; it does not measure body fat directly.
Formula
BMI = weight (kg) / height (m)²
Worked example
70 kg and 1.75 m: 70 / 1.75² = 22.9, which is in the healthy range.
Frequently asked questions
What are the WHO BMI categories?
Under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, 30 and above obesity.
Is BMI accurate for athletes?
No. Muscle weighs more than fat, so muscular people can have a high BMI without excess fat.
Does BMI apply to children?
No. Children and teenagers use age- and sex-specific growth charts.
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Results are estimates for information only. Check important figures with a professional.