BMI & Body Composition

Calculate your Body Mass Index (BMI) using metric or imperial units.

A beginner-friendly guide to understanding Body Mass Index (BMI), how it is calculated, its limitations, and what it tells you about your health.

Learn about the standard BMI categories, what your BMI means for your health, and the limitations of using BMI as a sole health indicator.

Understand the key differences between Body Mass Index (BMI) and Basal Metabolic Rate (BMR), what they measure, and when to use each.

Body Mass Index (BMI) uses your height and weight to estimate body fat and screen for potential health risks.

The number of calories your body burns at rest just to perform basic life-sustaining functions.

A BMI (Body Mass Index) calculator is a simple screening tool that evaluates a person's weight relative to their height. It computes a numerical value used by healthcare professionals to categorize individuals into underweight, normal weight, overweight, or obese categories. While a BMI calculator is a fast and easy metric for population studies, it does not measure body fat directly.

The Body Mass Index (BMI) formula was originally developed using the metric system. Calculating your BMI using kilograms and meters (or centimeters) requires less mathematical conversion and remains the global standard for health reporting.

For residents of the United States and countries that use the imperial system, calculating BMI requires converting pounds and inches to fit the original metric formula. Our tools handle this conversion automatically.