Free Online BMI Calculator

How to use BMI Calculator

1. Enter the measurements or amounts in the fields above.
2. Check that dimensions, rates and units match the labels.
3. Select “Calculate BMI” to see a clear estimate and the formula used.

What this tool does

Calculate body mass index from height and weight using metric units, with the standard adult category ranges.

Your input is processed in your browser and is not uploaded by this tool.

BMI = weight in kilograms ÷ height in metres squared. Adult screening ranges are shown as general reference values.

Before you start

• No account is required to open the tool.
• Check the supported input formats and limits on the tool page.
• Review generated or estimated results before relying on them.