BMI Calculator

Calculate adult body mass index and understand the range.

How it’s calculated

Body mass index compares weight to height. Adult categories follow the World Health Organization.

BMI = weight(kg) ÷ height(m)².
Under 18.5 underweight · 18.5–24.9 healthy · 25–29.9 overweight · 30+ obese.

Source: World Health Organization, Obesity and overweight fact sheet.

Continue exploring

Estimate body fat using body measurements.

Estimate daily energy needs.

Find a calorie target for steady fat loss.

Find a calorie target for lean muscle gain.