Does BMI diagnose a health condition?
No. BMI is a screening measure and cannot diagnose health or body composition.
BMI Calculator
Calculate body mass index from height and weight, with context about its limitations.
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Adjust the values below to get a clear estimate.
BMI formula and context
BMI is calculated from mass and height. Adult category labels shown are commonly used screening ranges; they are not diagnostic thresholds for an individual.
BMI = weight in kilograms / (height in meters)²Worked example
Metric example
Inputs: weight: 70 kg · height: 1.75 m
Illustrative result: BMI 22.9
70 divided by 1.75 squared, rounded to one decimal place.
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Frequently asked questions
Can I use pounds and inches?
Yes. Choose US customary units; the calculator converts units internally before applying the formula.