BMI Calculator

What is BMI?

BMI compares your weight with your height to estimate whether you're within a healthy weight range.

It's calculated using only two numbers:

• •Weight
• •Height

Because it's simple and standardized, it's widely used as a first-pass screening tool by health professionals.

Why use a BMI calculator?

BMI gives you a quick, standardized number that doctors, insurers, and health organizations like the WHO and CDC use as a common reference point. It won't diagnose anything on its own, but it's a useful starting point for understanding your weight relative to your height, and for tracking how it changes over time.

Example

Frequently Asked Questions

Common Mistakes to Avoid

• Double-check your height units. Entering centimetres but treating them as metres (or vice versa) can throw the result off by a factor of 100.
• Don't mix pounds and kilograms. Use the Metric/Imperial toggle above instead of converting by hand.
• BMI doesn't measure body fat directly. It only relates weight to height, so two people with the same BMI can have very different body compositions.

References

• World Health Organization (WHO)
• Centers for Disease Control and Prevention (CDC)
• National Institutes of Health (NIH)