BMI Calculator

A free online conversion calculator that calculate body mass index and check your health category. Get accurate results instantly without any software installation. Body Mass Index remains the most widely used screening metric for healthy weight ranges, appearing in fitness apps, medical intake forms, and insurance assessments. Computing BMI requires dividing weight by height squared with unit conversion between metric and imperial — a formula that is cumbersome to apply mentally and prone to rounding errors. Enter height and weight in metric or imperial units, and the tool computes BMI to one decimal place, classifies the result (underweight, normal, overweight, or obese), and shows the healthy weight range for your height. Select metric or imperial units, enter your height and weight, and the BMI value appears instantly alongside its WHO health category (underweight, normal, overweight, or obese). The interface also shows the healthy weight range for your specific height. BMI calculation runs as client-side JavaScript with no server transmission. Health and body measurements — sensitive personal data — stay completely private within your browser session, requiring no account or medical portal login.