Professional BMI Calculator
Calculate your Body Mass Index (BMI) and get personalized health insights
Calculate BMI
Professional BMI Calculator
Calculate your Body Mass Index (BMI) and get personalized health insights
Features
- Body Mass Index from weight and height (metric or imperial)
- WHO BMI categories: underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), obese (≥30)
- Inline conversion between kilograms / pounds and centimetres / inches
- Healthy weight range computed for your height
- Everything runs in your browser; weight and height are never uploaded
Tips & Best Practices
- BMI is a screening number, not a diagnosis — it does not account for muscle mass or body composition.
- Switch between metric and imperial inputs at the top; the formula stays the same internally (kg / m²).
- The healthy-range result is derived from your height; treat it as guidance, not a target.
- Athletes with high muscle mass often score "overweight" on BMI; that's a known limitation of the index.
- For medical advice consult a clinician — this tool computes the formula, nothing more.
FAQ
Is this tool free to use?
Yes, this tool is completely free with no registration required. There are no usage limits, no premium tiers, and no hidden costs. You can use it as many times as you need.
Is my data safe and private?
Absolutely. All processing happens locally in your browser. No data is ever sent to our servers or any third party. Your input never leaves your device, making it completely safe for sensitive information.
Does this tool work offline?
Once the page is loaded, the tool works entirely in your browser without requiring an internet connection. All processing is done client-side using JavaScript, so you can use it even when offline.
Which browsers are supported?
This tool works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. It is also fully functional on mobile browsers for both Android and iOS devices.
Can I use this tool on my phone or tablet?
Yes, the tool is fully responsive and works on all screen sizes including smartphones and tablets. The interface automatically adapts to your device for the best experience.