HEALTH & FITNESS
BMI Calculator
Calculate your Body Mass Index and healthy weight range.
100% free
No sign-up
Private — runs in your browser
Instant results
KEY TAKEAWAYS
- Calculate your Body Mass Index and healthy weight range.
- Free to use — no sign-up, no account and no usage limits.
- Runs entirely in your browser, so the numbers you enter stay private.
- Works on desktop and mobile with instant, accurate results.
Last updated: June 2026
About the BMI Calculator
Enter your height and weight in metric or imperial units to get your BMI, category and the healthy weight range for your height.
Frequently asked questions
Is BMI accurate for athletes?
BMI doesn't distinguish muscle from fat, so very muscular people can read as 'overweight'. Treat it as a quick screen, not a diagnosis.
Free online tool from ConvertFleet. Calculations run entirely in your browser — nothing you type is sent anywhere. Results are estimates for general guidance only.