BMI Calculator
Body Mass Index with WHO category and healthy weight range.
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About this calculator
BMI screens weight relative to height at population scale — it's cheap and correlates reasonably with body fat for most people. It cannot see muscle vs fat, so athletes often register 'overweight' while carrying little fat.
Asian populations face elevated metabolic risk at lower BMIs; several Asian guidelines flag risk from 23 onward rather than the universal 25 cut-off.
Formula
BMI = weight(kg) ÷ height(m)²
Health metrics are informational estimates and are not a medical diagnosis.
How to use the BMI Calculator
- Measure height without shoes, weight first thing in morning if possible.
- Enter both values — category updates instantly.
- Cross-check trends over months rather than single readings.
Frequently Asked Questions
Is BMI accurate for muscular people?
No — muscle is denser than fat, inflating BMI. Body-fat percentage or waist-to-height ratio are better there.
What's the Asian-specific threshold?
Many Asian health bodies use ≥23 overweight and ≥27.5 obese, reflecting different fat-distribution patterns.