Free BMI Calculator (Metric & Imperial)

BMI is a widely used screening tool to estimate whether your weight is in a healthy range for your height, though it doesn't account for muscle mass or body composition directly. Switch between kg/cm and lb/inches instantly, and get your result the moment you finish typing.

How to Use the BMI Calculator

1. Choose metric (kg/cm) or imperial (lb/inches) units.
2. Enter your height and weight.
3. Read your BMI value and see where it falls on the visual gauge the moment you finish typing.
4. Check which category your result falls into - underweight, normal, overweight, or obese.
5. Switch unit systems at any time to double check your result in the other format.

Who uses this tool: People starting a fitness or weight-management plan use it as a quick baseline check, healthcare and fitness professionals use it as an initial screening reference during consultations, and anyone comparing height/weight figures between metric and imperial units uses it to avoid doing the conversion math by hand, keeping in mind BMI is a general screening tool rather than a full body-composition measurement. Personal trainers use it alongside other measurements when setting a new client's starting benchmarks, and people tracking progress over several months use the gauge to see at a glance which category their current weight falls into as it changes.