How is BMI calculated?
Metric BMI is weight in kilograms divided by height in meters squared. The imperial formula multiplies pounds by 703, then divides by height in inches squared.
Calculate body mass index from height and weight, see the BMI formula, review adult category ranges, and understand the result's limits.
BMI
22.49
BMI = weight (kg) / (height (m))^2
BMI compares weight with height to provide a quick screening measure for adults. Enter your height and weight in the calculator, then use the category ranges as context rather than as a diagnosis.
BMI = weight (kg) / (height (m))^2
An adult who weighs 70 kilograms and is 1.75 meters tall has a BMI of 22.9 because 70 divided by 1.75 squared equals 22.9.
Calculate your basal metabolic rate — the calories your body burns at rest — from weight, height, age, and gender. Free BMR calculator, instant results.
Estimate your body fat percentage with the U.S. Navy method from height, neck, waist, and hip measurements. Free, instant, no sign-up needed.
Calculate your daily calorie needs for maintaining, losing, or gaining weight from your stats and activity level. Free calculator, instant results.
Calculate your total daily energy expenditure (TDEE) from BMR and activity level to set calorie targets. Free TDEE calculator with instant results.
Metric BMI is weight in kilograms divided by height in meters squared. The imperial formula multiplies pounds by 703, then divides by height in inches squared.
Common adult screening ranges describe 18.5 to 24.9 as healthy weight, but individual health cannot be determined by BMI alone.
BMI does not directly measure body fat, muscle mass, fat distribution, fitness, or metabolic health. Use it as one screening measure and discuss personal health questions with a qualified clinician.