Health & fitness calculator
BMI calculator
Estimate body mass index (BMI) using metric height and weight.
Formula and example
BMI = weight in kilograms ÷ (height in metres)².
Worked example
For 70 kg and 175 cm, BMI is 70 ÷ 1.75² = 22.9. BMI is a screening measure, not a diagnosis.
Assumptions and limits
For adults, BMI is a screening measure rather than a diagnosis. It does not account for body composition, age-related differences or pregnancy.
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Source
The BMI formula is weight in kilograms divided by height in metres squared. See the CDC explanation of adult BMI.