BMI Calculator
Calculate Body Mass Index from height and weight (metric or imperial).
- Instant
- 100% free
- Mobile ready
- No signup
Your BMI
22.9
Category
Normal
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How it works
Formula
BMI = weight(kg) ÷ height(m)²
Examples
- Underweight < 18.5
- Normal 18.5 – 24.9
- Overweight 25 – 29.9
- Obese ≥ 30
Frequently asked
Is BMI accurate?
BMI is a screening tool — it does not account for muscle mass or body composition.
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Accuracy & sources
How this tool is built and verified.
- Source
- Published formula
- Last reviewed
- Q2 2026
- Status
- Verified
Governing standards
- International System of Units (SI)BIPM — Bureau International des Poids et Mesures · The International System of Units (SI Brochure), 9th edition
- Standards aligned
- Formula verified
- Editor reviewed
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