HEALTH REFERENCES WITH CLEAR LIMITS
Adult BMI Calculator
Calculate body mass index for adults age 20 and older using U.S. customary or metric measurements.
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Your result
Ready when you are.
Enter your values and select Calculate. Your result stays on this device.
How it works
U.S. customary BMI = weight in pounds ÷ height in inches² × 703. Metric BMI = kg ÷ m².
Assumptions
For adults age 20+. BMI is a screening measure and does not diagnose disease or assess every aspect of health.
Use case
BMI calculator: a clear planning check
Calculate body mass index for adults age 20 and older using U.S. customary or metric measurements. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear BMI calculator scenario with values you can verify before relying on the result.
Source and update
Last reviewed: 2026-08-08
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