BMI Calculator
Calculate body mass index with metric or imperial units and see your category.
Your details
How the bmi calculator works
BMI compares weight to height. Below 18.5 is underweight, 18.5–24.9 healthy, 25–29.9 overweight and 30 or more obese.
Formula
BMI = weight (kg) ÷ height (m)²
Worked example
72 kg at 175 cm gives a BMI of 23.5, inside the healthy range.
Frequently asked questions
Is BMI accurate for athletes?
Not always. Muscle is denser than fat, so muscular people can score high without excess body fat.
What is a healthy BMI?
For most adults, 18.5 to 24.9. Children and older adults use different reference charts.
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