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BMI Calculator — Body Mass Index and Healthy Weight

Calculate your body mass index in metric or imperial units, see where it falls on the WHO scale, and the healthy weight range for your height.

Units

Weight (kg)

Height (cm)

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BMI is a screening number for adults 18+. It doesn't distinguish muscle from fat and isn't a diagnosis — talk to a doctor about your health.

BMI categories (WHO, adults)

How is BMI calculated?

Weight in kilograms divided by height in metres squared. 70 kg at 1.75 m = 70 ÷ 3.0625 = 22.9.

Is BMI accurate for athletes?

Not always — muscle is heavy, so muscular people can show as “overweight”. Waist size is a useful second check.