BMI Calculator

Calculate adult BMI in metric or imperial units and view the reference weight range.

About this tool

Calculate body mass index (BMI) using metric or imperial measurements. The result includes the adult BMI category and the weight range corresponding to BMI 18.5–24.9 for the entered height.

Metric and imperial units

Use centimetres and kilograms or switch to feet, inches and pounds. Both modes use the same BMI formula after unit conversion.

How to interpret BMI

BMI is a screening indicator based only on height and weight. It does not measure body composition and should not be treated as a medical diagnosis.

Private browser calculation

Your measurements are processed locally in the browser and are not sent to the server.

How to use

Choose the unit system, enter adult height and weight, then calculate BMI. Review the category and reference range together with the stated limitations.

FAQ

Is BMI Calculator free?

Yes. BMI Calculator is free to use in the browser and does not require registration.

Should I verify the result?

Yes. Use the result as a practical helper and verify important decisions in the target system or with a qualified specialist when needed.

Can I enter sensitive data?

Avoid entering confidential, regulated or production-critical data into online tools unless you have verified the processing path.

What BMI range is used for adults?

The calculator uses 18.5–24.9 as the general adult reference range. Individual assessment may differ because BMI does not account for body composition or health history.

Can I use feet, inches and pounds?

Yes. Select imperial units and enter height in feet and inches and weight in pounds. The values are converted before BMI is calculated.