BMI Calculator
Calculate Body Mass Index from weight in kilograms and height in centimeters. Instant WHO classification from Severely Underweight through Obese Class III.
- Instant BMI calculation
- WHO category classification
- Metric weight and height input
Enter your measurements
Type your weight in kilograms and height in centimeters. The calculator applies the standard BMI formula: weight divided by height squared.
Interpret the WHO category
Results include a named category based on World Health Organization thresholds. Categories range from Severely Underweight below 16 to Obese Class III above 40.
Understand BMI limitations
BMI does not distinguish muscle from fat. Athletes with high muscle mass may report elevated BMI despite excellent fitness. Use BMI as a screening indicator, not a diagnosis.
Review the numeric output
The JSON result includes your exact BMI rounded to one decimal, the category label, your entered weight in kg and height converted to meters.