BMI Calculator — Calculate Your BMI
Accurate BMI calculation with WHO adult categories and ideal weight range.
Calculator
WHO adult BMI categories are used (ages 18+). This tool is informational and not medical advice.
BMI Categories (WHO, adults):
- Underweight: < 18.5
- Normal range: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obesity class I: 30 – 34.9
- Obesity class II: 35 – 39.9
- Obesity class III: ≥ 40
Formula used: BMI = weight (kg) / (height (m))². For imperial: BMI = 703 × weight (lb) / (height (in))². Results rounded to two decimals.