Free Online BMI Calculator

Free Online BMI Calculator — Detailed Guide

Our free online BMI calculator helps you quickly determine your Body Mass Index (BMI), a widely used measure to evaluate whether a person has a healthy body weight for their height. BMI is calculated by dividing weight in kilograms by height in meters squared. A BMI between 18.5 and 24.9 is considered normal. Values below 18.5 indicate underweight, while values above 25 suggest overweight status. BMI above 30 is classified as obesity. This free online tool supports both metric and imperial units, so you can switch between kg/cm and lb/ft with ease. Note that BMI does not account for muscle mass, bone density, or body composition, so it should be used as a general indicator rather than a definitive health assessment.