BMI Calculator

Calculate body mass index (BMI), see a healthy weight range, and review WHO adult screening categories in your browser.

Enter your details

Values stay in your browser
cm

kg

years

Are you pregnant?

Example loaded: 170 cm / 65 kg.

Your result

WHO adult standard
22.49

Healthy weight range

Healthy weight range
53.5–72.0 kg
Distance to range
7.3 kg

BMI is a screening measure for adults and is best considered alongside other health information.

Weight categories under the current standard

WHO adult screening thresholds; not a diagnosis.

CategoryBMI rangeMeaning

Learn more

Formula, range, and standard

BMI equals weight (kg) divided by height (m) squared.

The healthy weight range is calculated from BMI values of 18.5 to 24.9 using WHO adult thresholds.

When BMI should not be used alone

BMI does not distinguish muscle from fat and adult thresholds are not intended to be used alone for children or during pregnancy. Speak with a clinician or registered dietitian for individual advice.

Examples and precision

At 170 cm and 65 kg, BMI is 22.49. At 180 cm and 81 kg, BMI is 25.00. The displayed value is rounded to two decimal places, while classification uses the unrounded value.

Privacy and source

This tool does not upload your data, require an account, or use a backend service. It is for general health information only and is not medical advice, diagnosis, or treatment.

Reference: World Health Organization: Obesity and overweight.

Frequently asked questions

How is BMI calculated?

BMI equals weight in kilograms divided by height in metres squared.

Does this calculator upload my data?

No. Calculations run locally in your browser and no entered values are uploaded.