BMI Calculator

Calculate your body mass index (BMI) in metric or imperial units. Free, no sign-up needed.

Calculate Your Body Mass Index

BMI Calculator computes your Body Mass Index from height and weight, in either metric or imperial units, and shows which WHO/NIH weight category your result falls into — along with the category’s numeric range and an explanation of what BMI does and doesn’t measure.

How to use

Choose Metric (kg, cm) or Imperial (lb, ft/in) units.
Enter your height and weight.
View your calculated BMI, weight category, and category range.

Common use cases

Getting a quick, standard BMI reading using either metric or imperial units.
Understanding which official weight category a BMI value falls into.
Tracking a BMI figure to discuss with a healthcare provider.

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