BMI Calculator
Calculate your Body Mass Index instantly. Metric and imperial. Nothing leaves your browser.
🔒 100% client-side
Unit System
Your Measurements
BMI Categories (WHO)
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | < 18.5 | Increased |
| Normal weight | 18.5 – 24.9 | Lowest |
| Overweight | 25.0 – 29.9 | Increased |
| Obese (Class I) | 30.0 – 34.9 | High |
| Obese (Class II) | 35.0 – 39.9 | Very High |
| Obese (Class III) | ≥ 40.0 | Extremely High |
Disclaimer: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, sex, or ethnic differences. Consult a qualified healthcare professional for a full health assessment.
About BMI Calculator
The BMI Calculator computes your Body Mass Index — a simple ratio of weight to height squared — entirely in your browser. Switch between metric (kg/cm) and imperial (lb/ft+in) units, hit Calculate, and instantly see your BMI value, weight category, and where you fall on the standard WHO scale. Nothing is sent to any server; all arithmetic happens locally.