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BMI calculator
Body Mass Index in kg/cm or lb/ft, with the healthy weight range for your height.
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About BMI calculator
Calculate your body mass index (BMI) from your height and weight, in metric or imperial units, and see which range it falls in: underweight, healthy weight, overweight or obese. BMI is a quick screening number, not a diagnosis, because it does not separate muscle from fat.
How to use BMI calculator
- Choose kg and cm, or lb and feet.
- Enter your weight and height.
- Read your BMI and the healthy weight range for your height.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
What is a healthy BMI?
For most adults a BMI between 18.5 and 24.9 is considered a healthy weight, 25 to 29.9 overweight, and 30 or more obese.
Is BMI accurate for athletes?
Not always. Muscle weighs more than fat, so a very muscular person can have a high BMI without extra body fat. Waist measurements and body fat percentage give a fuller picture.
How is BMI calculated?
BMI is weight in kilograms divided by height in metres squared. The tool does this for you after you enter your numbers in metric or imperial units.
Should children use the same BMI categories?
No. Children and teenagers are compared with growth charts for their age and sex. Ask a doctor or nurse to interpret BMI for anyone under 18.
Is BMI calculator free?
Yes. BMI calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put BMI calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.