BMI Calculator
Calculate your Body Mass Index using your height and weight. Get your BMI number, category, healthy weight range and more.
Calculate Your BMI
Enter your height and weight below. Choose the measurement system that you normally use.
Your BMI Result
Enter your height and weight and click Calculate My BMI.
BMI Categories for Adults
For adults, BMI is commonly interpreted using the following categories.
| BMI | Category | General interpretation |
|---|---|---|
| Below 18.5 | Underweight | Below the commonly used adult BMI range |
| 18.5 – 24.9 | Healthy weight | Within the commonly used healthy BMI range |
| 25.0 – 29.9 | Overweight | Above the commonly used healthy BMI range |
| 30.0 – 34.9 | Obesity class I | Higher BMI category |
| 35.0 – 39.9 | Obesity class II | Higher BMI category |
| 40.0+ | Obesity class III | Higher BMI category |
Target BMI Calculator
Estimate the weight corresponding to a selected BMI at your current height.
How Is BMI Calculated?
BMI, or Body Mass Index, is calculated by dividing body weight in kilograms by height in metres squared.
For example, a person weighing 70 kg and measuring 1.75 m tall has a BMI of approximately 22.9.
Frequently Asked Questions About BMI
What does BMI stand for?
BMI stands for Body Mass Index. It is a numerical measure calculated from a person's weight and height.
What is a healthy BMI?
For many adults, a BMI from 18.5 to 24.9 is commonly classified as the healthy-weight range. BMI is only one measure and does not directly measure body fat.
Can BMI be used for children?
Children's BMI is interpreted differently from adult BMI. Age and sex are important when assessing BMI in children and teenagers, so this adult calculator should not be used to interpret a child's BMI.
Is BMI the same as body fat percentage?
No. BMI is based on height and weight. It does not directly measure body fat percentage or body composition.
Does BMI work for athletes?
BMI may be less informative for people with substantial muscle mass because muscle weighs more than fat. BMI should therefore be considered alongside other health information.