Calculators · free
BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight. Supports metric and imperial units.
BMI is a screening number, not a diagnosis. Athletes and very muscular people often read high.
Your BMI
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Category
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Healthy weight range
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What the number means
Below 18.5Underweight
18.5 - 24.9Normal weight
25 - 29.9Overweight
30 and overObesity
About the BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight. Supports metric and imperial units.
The calculation runs entirely in your browser. Your height and weight never leave your device.
How to use the BMI Calculator
- Step 1Choose metric or imperial units.
- Step 2Enter your height and weight.
- Step 3Press Calculate BMI to see your score, category and a healthy weight range for your height.
What you get
- Metric and imperial units
- BMI category and healthy weight range
- Instant recalculation
- Nothing sent to a server
BMI Calculator — FAQ
How is BMI calculated?
BMI is weight in kilograms divided by height in metres squared (kg/m2). The imperial result is the same once pounds and inches are converted.
What is a healthy BMI?
For most adults a BMI between 18.5 and 24.9 is considered healthy. The number is a population guideline and does not account for muscle, bone density or body shape.
Is BMI accurate for everyone?
No. Trained athletes can have a high BMI from muscle, and older adults may carry more fat at a normal BMI. Use it as a starting point, not a diagnosis.
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