BMI Calculator

About the BMI Calculator

Body mass index compares weight to the square of height, giving a single number used as a rough population-level screening measure. This calculator accepts metric or imperial input and shows your figure alongside the standard categories.

BMI is a blunt instrument. It cannot distinguish muscle from fat and takes no account of age, sex, build or body composition, so treat the result as a starting point for a conversation with a healthcare professional rather than a diagnosis.

How to use the BMI Calculator

1. 1Choose metric or imperial units.
2. 2Enter your height and weight.
3. 3Read your BMI value and category.
4. 4Review the healthy weight range shown for your height.

Features

• Metric input in centimetres and kilograms
• Imperial input in feet, inches and pounds
• Standard adult category bands
• Healthy weight range for your height
• Explicit note on the measure's limitations

Why people use it

• Get a consistent figure to discuss with a clinician.
• Understand where a target weight would place you.
• Convert between unit systems without a second tool.

Common use cases

• Filling in a health questionnaire that requests BMI.
• Tracking a broad trend over several months.
• Understanding a figure quoted at a check-up.

Privacy and your data

Everything you type or open here is processed by your own browser. No file, text or result is uploaded to a server, stored in a database or shared with anyone, and closing the tab clears it completely.

Frequently asked questions

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