BMI Calculator
Health and fitness calculations including BMI and body metrics.
BMI Calculator
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BMI Calculation
- • Body Mass Index calculation
- • Weight and height input
- • BMI category classification
- • Health assessment tool
Health Monitoring
- • Track BMI changes
- • Monitor health goals
- • Understand weight categories
- • Health awareness
Privacy & Features
- • 100% client-side calculations
- • No data sent to servers
- • Calculation history
- • Works offline
About the BMI Calculator
The BMI Calculator computes your Body Mass Index from your height and weight, a common screening number that estimates whether your weight falls in a typical range for your height. It gives you a quick, standardized figure to discuss with a professional.
BMI is widely used as a starting point for thinking about weight and health. While it’s a simple measure, it provides a fast reference and a consistent number you can track over time or bring to a doctor.
Calculations run in your browser with nothing uploaded and no account, so your personal measurements stay private.
How to use the BMI Calculator
- Choose your units (metric or imperial).
- Enter your height.
- Enter your weight.
- Calculate your BMI.
- Read your BMI value and which category it falls into.
Common use cases
- Getting a quick BMI figure for a general health check.
- Tracking BMI over time as part of a fitness goal.
- Preparing a number to discuss with a doctor.
- Converting between metric and imperial while checking BMI.
Frequently asked questions
How is BMI calculated?
BMI is your weight divided by the square of your height (in consistent units). The calculator handles the math and the unit conversion for you.
What do the BMI categories mean?
BMI ranges are grouped into categories such as underweight, normal, overweight, and obese as a general screening guide, not a diagnosis.
Is BMI an accurate measure of health?
BMI is a useful screening tool but has limits — it doesn’t distinguish muscle from fat or account for body composition. Treat it as one indicator, not the whole picture.
Are my measurements uploaded?
No. Calculations run in your browser, so your personal data never leaves your device.
Does it support both metric and imperial units?
Yes. You can enter height and weight in metric or imperial, and the calculator adjusts accordingly.