Health & Daily Life
BMI calculator
Enter your height and weight. You get your BMI, the category and the weight range that counts as healthy for your height. A screening number, not a diagnosis.
- Free, no sign-up
- Runs in your browser
- Nothing uploaded
You
Units
Options
The Asia-Pacific cut-offs are lower because health risk rises at a lower BMI in many Asian populations.
Only used to warn if the adult categories do not apply.
Result
Table
How to use this tool
- Choose metric (centimetres, kilograms) or imperial (feet, inches, pounds).
- Enter your height and weight, and pick WHO or Asia-Pacific cut-offs.
- Read your BMI, its category and the healthy weight range for your height.
- Remember that BMI is a screening number, not a diagnosis.
How it works
BMI = weight in kg ÷ (height in metres)²
The WHO adult categories are: under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, 30 or more obese. The Asia-Pacific guideline lowers the overweight line to 23 and the obese line to 27.5.
BMI is a quick screen for populations. It cannot tell muscle from fat and is not meant for children, pregnant women or competitive athletes. Treat it as one number to discuss with a doctor, not a verdict.
Good to know
Body mass index is weight in kilograms divided by height in metres squared. The WHO classes 18.5 to 24.9 as a healthy range, 25 to 29.9 as overweight and 30 or more as obese. For people of Asian descent, lower cut-offs are often used, because health risks rise at a lower BMI. This tool lets you pick either set.
BMI does not distinguish muscle from fat, and it ignores where fat is stored, age and sex. Athletes can have a high BMI and be healthy. Waist size and other measures give extra information. This calculator is for general information and is not medical advice. Ask a doctor or dietitian about your own health.
Frequently asked questions
Is BMI accurate?
It is a reasonable first check for most adults but misses body composition. Waist size and other tests give a fuller picture.
Which cut-offs should I use?
WHO international is the standard. Many Indian doctors use the Asia-Pacific cut-offs. Ask yours if unsure.
Is my data stored?
No. Nothing is stored or sent.