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BMI Calculator

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Math & Data

BMI Calculator

Calculate your Body Mass Index.

Workspace

Run the tool here

Browser utility

Units

Weight

Height

Output

Run the workspace to see the response here.

How to use

Choose metric or imperial units.
Enter height and weight.
Read the BMI value and category.

About this tool

Calculate body mass index from height and weight, with the standard category ranges.

BMI Calculator is part of the TmpMailer Math & Data set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

A quick screening number for a fitness log.
Checking a unit conversion.
Understanding the BMI formula.

Common questions

Is BMI a diagnosis?

No. It is a population-level screening measure that ignores muscle mass, body composition and age. Consult a clinician for health advice.

Why are the categories different for children?

Children and teenagers use age- and sex-specific percentiles rather than fixed adult thresholds.

Does BMI work for athletes?

It often overstates risk for muscular people because muscle is denser than fat.

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