BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units and see your weight category.
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What Is the BMI Calculator?
The BMI Calculator works out your Body Mass Index from your height and weight, in metric (cm/kg) or imperial (ft-in/lb) units, and shows which standard category it falls into. It's a quick screening number used worldwide. All calculations happen in your browser.
How It Works
Choose metric or imperial, enter your height and weight, and your BMI and category update instantly.
When to Use It
Use it to get a general sense of whether your weight is in a healthy range for your height, or to track changes over time.
Frequently Asked Questions
- How is BMI calculated?
- BMI = weight (kg) ÷ height (m)². For imperial units the figures are converted to metric first. A BMI of 18.5–24.9 is generally considered the normal range.
- Is BMI accurate for everyone?
- No. It doesn't distinguish muscle from fat and isn't suitable for athletes, children, the elderly or during pregnancy. Treat it as a rough screening tool, not a diagnosis.
Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.
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