BMI Calculator

Calculate your Body Mass Index (BMI) to determine whether you are underweight, normal weight, overweight, or obese. Toggle between imperial and metric units for accurate results.

Height (ft)

Height (in)

Weight (lbs)

How to Use

Select your preferred unit system — imperial (feet/inches, pounds) or metric (centimeters, kilograms). Enter your height and weight, then click Calculate BMI. The calculator instantly shows your BMI value, its category, and a visual scale showing where you fall on the BMI spectrum.

Formula

BMI = weight (kg) / height (m)²

For imperial units, the formula is BMI = (weight in lbs × 703) / (height in inches)². A BMI below 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese. BMI is a screening tool — it does not directly measure body fat or account for muscle mass, age, or gender.