BMI Calculator

Body Mass Index (BMI) estimates body fatness using your weight and height. Use this free calculator to find your BMI and see your weight category. It works for adults of all sizes.

Estimates only — not professional financial advice.

Weight (kg)

Your body weight in kilograms

Height (cm)

Your height in centimeters

—

Track your progress with a smart scale or fitness app to stay on top of your health goals. See recommendations. Estimates only, not medical advice. Some links are affiliate links.

How it works

BMI is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = weight ÷ height². For example, 70 kg at 1.75 m gives 70 ÷ (1.75 × 1.75) = 22.9.

Standard adult categories are: under 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30 or above is obese. We also estimate the healthy weight range for your height.

Tips

BMI is a screening tool, not a diagnosis. Muscular people may show a high BMI without excess fat, while older adults may have more body fat at a normal BMI.

For a fuller picture of health, combine BMI with waist measurement, activity level, and a conversation with your doctor.

FAQ

Is BMI accurate for everyone?

BMI is a useful general estimate but does not directly measure body fat. Athletes, pregnant people, and the elderly may get misleading results, so use it as one of several indicators.

What is a healthy BMI?

For most adults, a BMI between 18.5 and 24.9 is considered the healthy range. Values below or above this may carry increased health risks.

How do I use pounds and inches?

This calculator uses kilograms and centimeters. To convert: divide pounds by 2.205 for kg, and multiply inches by 2.54 for cm.