BMI Calculator

Usage Guide

Enter your height and weight to get your Body Mass Index, weight category, and a healthy weight range. The calculator supports metric (cm/kg) and imperial (ft·in/lb) units, plus two standards: WHO international thresholds at 18.5, 25, and 30, and the Chinese adult guideline at 18.5, 24, and 28, which defines a narrower normal range for the same body.

Examples

• At 175 cm and 70 kg the BMI is about 22.9 — normal under both standards.
• Estimate your BMI before a check-up, then read it alongside waist size and body fat.
• Enter 5 ft 9 in and 154 lb in imperial mode; the result matches the metric one.

FAQ

• Is BMI accurate? BMI is a quick screening tool, but it cannot tell muscle from fat, so athletes may read as overweight.
• Does it work for children? Children and teens should use age- and sex-specific growth charts instead of adult cut-offs.
• Is my data uploaded? No. Every calculation runs locally in your browser.