BMI is the standard quick screening number used by doctors and health guidelines worldwide. Enter your height and weight in either metric or imperial units and get your BMI and category instantly, calculated entirely in your browser.
How to use the bmi calculator tool
- 1
Choose your units
Switch between metric (cm/kg) and imperial (ft/in/lb).
- 2
Enter height and weight
Type in your measurements.
- 3
Read your BMI and category
Your BMI updates instantly, along with which range it falls into.
Common use cases
Check a general health indicator
Get a quick, standard BMI reading to discuss with a healthcare provider.
Track progress over time
Recalculate periodically as weight changes to see how BMI shifts.
Compare metric and imperial readings
Switch units to double-check a BMI reported in a different measurement system.
Frequently asked questions
Body Mass Index is weight divided by height squared. It's a quick screening tool, not a diagnostic measure — it doesn't account for muscle mass, bone density, or body composition.