BMI Calculator

Calculate your Body Mass Index from height and weight, in metric or imperial units, with the standard WHO category.

How it works

  1. Enter height and weight in metric (cm/kg) or imperial (ft-in/lb).
  2. Read your BMI and which standard WHO category it falls into.
  3. Nothing is stored the calculation runs entirely in your browser.

Frequently asked questions

Is BMI accurate for everyone?

BMI is a general screening tool and doesn't account for muscle mass, age, or body composition — athletes and older adults should interpret it with care.

What are the BMI categories?

Under 18.5 = underweight, 18.5–24.9 = normal, 25–29.9 = overweight, 30+ = obese (WHO standard).

Related tools