Calculate body mass index (BMI) in kg/cm or lb/in and see the healthy weight range for your height.
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How to use the bmi calculator
- Choose metric or US units.
- Enter weight and height.
- Read your BMI, category and healthy range.
BMI categories (adults)
Under 18.5 underweight, 18.5-24.9 healthy, 25-29.9 overweight, 30 and above obesity. BMI does not distinguish muscle from fat and is not designed for children or pregnancy.
Frequently asked questions
How is BMI calculated?
Weight in kg divided by height in metres squared (or 703 x lb / in squared).
Is BMI accurate?
It is a quick screening tool, not a diagnosis. Athletes often score high because of muscle.
What is a healthy BMI?
18.5 to 24.9 for most adults.