Utility tool
BMI Calculator
Enter your height and weight to calculate BMI and your healthy weight range using the WHO adult classification.
Free｜No sign-up｜Files stay on your device
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Support us／Ko-fiAbout BMI Calculator
BMI is the simplest screening measure of body weight: your weight in kilograms divided by your height in meters squared. This calculator uses the World Health Organization's adult categories.
Besides your BMI, it shows the healthy weight range for your height — often easier to act on than the number itself.
Great for
- ・Checking in before a health exam
- ・Setting a weight goal
- ・Fitness class assignments
How to use
- 01Fill in each field.
- 02Results are calculated instantly below.
Why use it
Private by design
Everything runs locally in your browser. Nothing passes through a server.
Instant
No software to download and no account to create.
Works everywhere
Desktop, phone, or tablet — any modern browser.
Free forever
No watermarks and no usage limits.
Frequently asked questions
What is a healthy BMI?
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Under the World Health Organization adult classification: below 18.5 is underweight, 18.5–24.9 is a healthy weight, 25–29.9 is overweight and 30 or above is obesity.
Does BMI apply to everyone?
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No. It isn't suitable for pregnant women, people under 18 or very muscular athletes, and some Asian populations use lower cut-offs. Treat it as a general screening guide for adults.
Is this tool free? Do I need an account?
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It's completely free. There's no sign-up, no login and no usage limit.
Are my files and data safe?
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Everything is processed inside your browser. Your files are never uploaded to our servers and disappear when you close the page.
Does it work on my phone?
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Yes. The page is fully responsive and works in current versions of Chrome, Safari and Edge on iPhone, Android and tablets.
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