What is the BMI?
The body mass index relates weight to height: weight in kilograms divided by height in meters squared. The WHO uses it to classify weight: below 18.5 underweight, 18.5 to 24.9 normal, 25 to 29.9 overweight, and 30 or more obese.
It is a quick screening value, not a diagnosis. Athletes with a lot of muscle can have a high BMI without excess fat.
How to use the BMI Calculator
- 1Choose metric or imperial units.
- 2Enter your weight and height.
- 3Read your BMI and healthy weight range.
Frequently asked questions
Is the BMI accurate?
It is a simple estimate. Muscle, age and body build are not considered.
Is my data stored?
No. Everything is calculated in your browser.