In short: BMI Calculator works out your Body Mass Index from your height and weight, in metric or imperial units, and shows your WHO category and healthy weight range.
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Your files and text are handled entirely on your device using your browser. They are never uploaded to our servers.
Your measurements are calculated in your browser and never sent anywhere.
How to use BMI Calculator
3 quick steps. Most people are done in under a minute.
- 1
Choose metric or imperial units.
- 2
Enter your height and weight.
- 3
See your BMI, category and healthy weight range instantly.
BMI Calculator features
- Metric (cm, kg) or imperial (ft, in, lb)
- Visual scale showing where your BMI falls
- Healthy weight range for your height
- Instant results, nothing stored
When to use BMI Calculator
- Check whether your weight is in a healthy range
- Track progress toward a fitness goal
- Fill in BMI on health or insurance forms
About this tool
Calculate your BMI in metric or imperial units and see where it falls on the WHO adult scale, together with the healthy weight range for your height. Results update instantly as you type.
BMI Calculator FAQ
How is BMI calculated?
BMI is your weight in kilograms divided by your height in meters squared. For example, 68 kg ÷ (1.70 m × 1.70 m) = 23.5.
What is a healthy BMI?
For adults, a BMI from 18.5 to 24.9 is considered a healthy weight by the World Health Organization. Under 18.5 is underweight, 25–29.9 is overweight and 30 or more is obesity.
Is BMI accurate for everyone?
No. BMI doesn’t distinguish muscle from fat and doesn’t account for age, sex or ethnicity. It isn’t suitable for children, pregnant people or athletes. Ask a healthcare professional for a full assessment.
Can I use pounds and feet?
Yes. Switch to imperial units and enter your height in feet and inches and your weight in pounds.