BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight online, free, with the healthy-range category.
How to use BMI Calculator
- Enter your weight in kilograms.
- Enter your height in centimetres.
- Read your BMI and healthy-range category.
About BMI Calculator
BMI Calculator is a free Becoderr tool. It needs no sign-up, runs fast and privately, and works right in your browser for most tasks. For the few server-based tools, your files are processed in memory and discarded immediately after the operation.
Frequently asked questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered normal; below is underweight, 25–29.9 overweight, 30+ obese.
Is BMI accurate for everyone?
BMI is a general guide and doesn't account for muscle mass or body composition, treat it as one indicator, not a diagnosis.
Is this tool free to use?
Yes. Every tool on Becoderr is completely free with no sign-up required. Signed-in users get higher file-size limits.
Are my files safe?
Yes. Browser-based tools process files entirely on your device; nothing is uploaded. Server-based tools process files in memory and discard them immediately after the operation.
Is there a file size limit?
Server-based tools accept up to 5 MB for anonymous users and 50 MB when signed in. Browser-based tools are limited only by your device.