★ Free Calculator
BMI Calculator
Calculate Body Mass Index in metric or imperial units, with the WHO category.
Loading the tool…
Runs entirely in your browser. Your files and text are never uploaded to our server.
About this toolBMI Calculator estimates Body Mass Index from height and weight and shows the World Health Organization category for adults.
Learn more - Instant results
- 100% free
- No sign-up
- Private
BMI Calculator estimates Body Mass Index from height and weight and shows the World Health Organization category for adults.
More about BMI CalculatorHow to use, good to know & FAQ
How to use BMI Calculator
- Choose metric or imperial units.
- Enter height and weight.
- Read your BMI and category.
Good to know
- BMI is a screening number, not a diagnosis. It does not account for muscle mass, age or body shape. Talk to a doctor about your health.
Frequently asked questions
What is a healthy BMI?
For adults, the WHO range 18.5 to 24.9 is classed as healthy weight.
Is BMI accurate for athletes?
BMI does not separate muscle from fat, so very muscular people may score high while being healthy.
When to use BMI Calculator
- Check your BMI category
- Track changes over time
- Compare metric and imperial results
- Understand healthy weight ranges
📘 Read the guide: How to Calculate Percentages: Simple Formulas With Examples