BMI Calculator
BMI Calculator works out your Body Mass Index from your height and weight, in metric or imperial units, and tells you which standard weight category you fall into.
🔒 Calculated instantly in your browser.
How to use BMI Calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Read your BMI and category instantly.
Frequently asked questions
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². For imperial, it uses 703 × lb ÷ in².
What do the categories mean?
Under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
BMI is a general guide and doesn't account for muscle mass or body composition, so treat it as a rough indicator.
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