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Unit System

Height (cm)

Weight (kg)

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Written by the EachTools Team

Last updated: January 2026

How BMI Is Calculated

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared.

Formula

BMI = weight(kg) / height(m)²
Or: BMI = weight(lbs) × 703 / height(in)²

Steps

Enter your weight in pounds or kilograms.
Enter your height in feet/inches or centimeters.
Click Calculate to see your BMI value.
Interpret the result: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Example

A person who is 5'9" (175 cm) and weighs 170 lbs (77 kg): BMI = 77 / 1.75² = 25.1 (overweight).

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