How it works
The method behind the number.
Estimate adult body mass index from height and weight. This tool explains the calculation so you can adjust the assumptions to match your situation.
Your formula appears here after the calculator loads.
Health & fitness
BMI calculator
Estimate adult body mass index from height and weight.
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Your result
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Enter your numbers to see the answer.
BMI calculator guide
What does this calculator help you figure out?
Estimate adult body mass index from height and weight. This free online calculator is designed for people who need a quick, transparent estimate rather than a black-box answer. Enter weight, height, review the assumptions, and adjust the values to match your project or situation.
How is the result calculated?
BMI = weight in kilograms ÷ height in meters².
Example and assumptions
For a useful first estimate, start with the sample values already shown in the calculator, then replace them with your own measurements or figures. Keep all dimensions in compatible units and round up where the result represents a quantity you must buy.
This is an educational screening estimate, not a diagnosis or a substitute for professional medical advice.
Common questions
Frequently asked questions
What does this bmi calculator calculate?
Estimate adult body mass index from height and weight. The page shows the result, a breakdown, and the formula used so you can check the calculation.
What information do I need?
You will need weight, height. The labels and units beside each field show what the calculator expects.
How accurate is the result?
This is an educational screening estimate, not a diagnosis or a substitute for professional medical advice. Accuracy depends on the quality of the inputs and the assumptions used by the underlying formula.
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