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How to use this calculator
For adults, BMI is a screening measure, not a diagnosis.
How it's calculated
BMI = weight (kg) ÷ height (m)². A BMI of 18.5 to 24.9 is considered the healthy range for adults. BMI is a screening measure, not a diagnosis, so speak to a doctor about your health.
Worked example
70 kg at 1.75 m: 70 ÷ 3.0625 = 22.9, which is in the healthy range.
Frequently asked questions
What does BMI mean?
BMI is a screening measure based on height and weight. It does not diagnose health conditions.
Is BMI suitable for everyone?
BMI has limitations and is not interpreted the same way for children, pregnancy, athletes and some other groups.
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Last updated October 2026. Results are estimates for guidance. Calculations run in your browser and are not stored.