BMI Calculator
Calculate your Body Mass Index from weight and height. Get your health category instantly.
Metric & ImperialHealth categoryNo signup
Unit
Text stays on your device
Enter weight and height to calculate your BMI
Documentation
What is BMI?
BMI measures body fat using weight and height. Formula: weight (kg) / height (m)². It classifies health status.
BMI Categories
Underweight: below 18.5 | Normal: 18.5–24.9 | Overweight: 25–29.9 | Obese: 30+
How to use
- 1) Enter your weight (kg or lbs).
- 2) Enter your height (cm or ft/in).
- 3) View your BMI and health category.
FAQs
What is BMI?
BMI measures body fat using weight and height. It classifies whether a person is underweight, normal, overweight, or obese.
What are BMI categories?
Underweight (below 18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (30+).
Is BMI accurate for everyone?
BMI is general. It may not be accurate for athletes, elderly, pregnant women, or very muscular individuals.
Does it store my data?
No. All calculations happen locally in your browser. Your data is never uploaded or stored.
Is it free?
Yes. Completely free with no signup or limits.
Privacy: All processing runs in your browser. Nothing is stored.