Calculate your Body Mass Index using cm and kg. Supports imperial too. Shows category, gauge, and healthy range.
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Knowledge Base
BMI = weight (kg) ÷ height² (m²). First convert height from cm to meters (divide by 100), then square it, then divide weight by that result. Example: 70 kg, 170 cm → 70 ÷ 1.7² = 70 ÷ 2.89 = 24.2.
A BMI between 18.5 and 24.9 is considered Normal weight. Below 18.5 is Underweight; 25.0–29.9 is Overweight; 30.0+ is Obese (WHO classification).
BMI = 70 ÷ (1.75)² = 70 ÷ 3.0625 = 22.9 — Normal weight range.
The BMI formula is the same for both sexes. However, men typically have more muscle mass at the same BMI, so the health risk interpretation may differ. Waist circumference and body fat percentage are complementary measures.