BMI Calculator
Calculate your Body Mass Index (BMI) from your height and weight, in metric or imperial units.
BMI is calculated entirely in your browser and is a general screening measure, not a medical diagnosis. Nothing is sent to a server.
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How to use this tool
- 1Choose metric or imperial units.
- 2Enter your weight and height.
- 3Your BMI and weight category appear automatically.
Features
- Supports both metric (kg, cm) and imperial (lb, ft/in) units.
- Shows the standard weight category alongside your BMI.
- No account or sign-up required.
Privacy
Your weight and height are calculated entirely in your browser. This health information is never sent to a server, logged or stored.
Frequently asked questions
Is this BMI calculator free?
Yes, and there is no limit on how many times you can use it.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². The categories (Underweight, Normal weight, Overweight, Obese) follow the standard thresholds.
Is BMI a medical diagnosis?
No. BMI is a general screening measure and does not account for muscle mass, bone density or body composition. Talk to a healthcare provider for medical advice.
Is my health information sent to a server?
No. Calculation happens locally in your browser and nothing is stored.
Guides
- How to Calculate and Understand Your BMI
Body Mass Index is a quick, widely used screening number, not a diagnosis. Here's how it's calculated, what the standard ranges mean, and its limits.