CalcInfinityBMI Calculator
Calculate your Body Mass Index and see your healthy weight range — as you type.
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.
How BMI is calculated
BMI turns your weight and height into a single number using one fixed formula — the same one used worldwide for adults, regardless of age or sex.
Example
BMI Categories
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)
Last reviewed July 2026