About the BMI Calculator
Body Mass Index (BMI) is a quick screening measure that relates weight to height. Enter your height and weight in metric or US units to see your BMI, your WHO category and the healthy weight range for your height.
How to use it
- Choose metric or US units.
- Enter your height and weight.
- Read your BMI, category and healthy weight range.
Formula & method
BMI = weight (kg) ÷ height (m)²
US: BMI = 703 × weight (lb) ÷ height (in)²Frequently asked questions
What is a healthy BMI?
For adults, a BMI from 18.5 to 24.9 is classed as a healthy (normal) weight by the World Health Organization.
Is BMI accurate for athletes?
No. BMI does not distinguish muscle from fat, so muscular people can be classed as overweight. Pair it with a body fat or waist measurement.
Results are estimates for general information only and are not financial, tax, legal or medical advice. Please confirm important decisions with a qualified professional.