BMI calculator

Height and weight - your BMI and category appear instantly. Enter any height and weight unit; the others fill in automatically.

Height

Total inches

Centimeters

Weight

Pounds (lb)

Kilograms (kg)

Stone (st)

BMI is weight divided by the square of height - metric (kg/m) or imperial (BMI = 703 x lb / in²). This tool takes height in cm, inches or feet+inches and weight in kg, lb or stone, converting between them as you type. Under 18.5 is underweight, 18.5-24.9 is normal, 25-29.9 is overweight, 30+ is obese. Calculated in your browser.