BMI Calculator (Metric) — kg and cm Body Mass Index Tool
Use this metric BMI calculator to find your Body Mass Index. Enter weight in kilograms and height in centimeters — no unit conversion required.
BMI Calculator
BMI
22.86
Category
Normal
US: lb/in. Metric: kg/cm.
How It Works
Metric BMI formula: weight (kg) ÷ (height in meters)². Since height is entered in centimeters, convert to meters by dividing by 100.
Example: 70 kg, 175 cm → 70 ÷ (1.75 × 1.75) = 22.86 BMI.
All BMI categories (underweight, normal, overweight, obese) apply identically whether you use metric or US customary units.
Frequently Asked Questions
Which is more accurate: metric or US BMI?
Identical — they're the same formula with different unit conversions. 1 kg = 2.205 lbs, 1 cm = 0.39 inches.
Why use metric BMI instead of US?
Simpler math. Metric BMI = kg ÷ m² (two numbers). US BMI = (lbs ÷ in²) × 703 (three numbers). Result is the same.