BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units.
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How to use the BMI Calculator
- Open the BMI Calculator.
- Enter your input in the fields provided - results update as you type where practical.
- Use Copy or Download to take the result with you, or Reset to start again.
How it works
BMI = weight (kg) / height (m) squared. BMI is a screening measure, not a diagnosis - it does not account for muscle mass, age or body composition. Talk to a clinician about your health.
Privacy note: this tool runs locally in your browser. Your input is not uploaded, stored in analytics, or placed in the page URL.
Frequently asked questions
Is the BMI Calculator free?
Yes. It is completely free, needs no account, and runs in your browser.
Is my data uploaded when I use the BMI Calculator?
No. Processing happens locally on your device. We do not upload your inputs, files or generated passwords.
How does the BMI Calculator work?
BMI = weight (kg) / height (m) squared. BMI is a screening measure, not a diagnosis - it does not account for muscle mass, age or body composition. Talk to a clinician about your health.
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