Calculate Body Mass Index (BMI) using your weight and height.
The Numelios BMI Calculator estimates body mass index using height and weight. BMI is a commonly used screening measurement that relates body weight to height and provides a numerical value that can be compared with standard adult BMI categories.
BMI can provide a quick general reference, but it does not directly measure body fat, muscle mass, body composition, or overall health.
Using metric measurements, BMI is calculated by dividing weight in kilograms by height in meters squared.
Using pounds and inches, the calculation can be written as:
For example, consider an adult who weighs 70 kg and is 1.75 meters tall.
BMI categories are screening references and should not be interpreted as a diagnosis or a complete assessment of an individual's health.
Generally classified as underweight for adults.
Generally classified within the healthy-weight range for adults.
Generally classified as overweight for adults.
Generally classified within the obesity range for adults.
BMI provides a standardized way to compare weight relative to height. Because the calculation requires only two measurements, it is simple to calculate and commonly used as a screening tool.
However, BMI does not distinguish between muscle, fat, bone, or other components of body weight. Two people with the same BMI can therefore have substantially different body compositions.
Factors such as muscle mass, body composition, age, and other individual characteristics can affect how useful BMI is when interpreted for a particular person.
For example, someone with substantial muscle mass may have a relatively high BMI even though BMI alone does not show how much of that weight comes from muscle rather than body fat.
BMI for children and teenagers is not interpreted using the same fixed adult categories. Age and sex are considered when BMI is evaluated for children and adolescents.
The adult BMI ranges shown on this page should therefore not be used to classify a child's BMI.
If you need to calculate an exact age from a date of birth, use the Age Calculator . Age can be particularly relevant when determining whether adult BMI categories are appropriate.
For general percentage calculations, including percentage changes and ratios, use the Percentage Calculator .
BMI stands for body mass index. It is a numerical measurement calculated using a person's weight relative to height.
Standard adult BMI categories generally describe 18.5 through 24.9 as the healthy-weight range. BMI is only a screening measure and does not by itself determine health.
No. BMI is calculated from height and weight and does not directly measure body fat percentage or body composition.
Yes. Because BMI does not distinguish muscle from body fat, greater muscle mass can contribute to a higher BMI.
The mathematical BMI calculation uses height and weight, but interpretation for children and teenagers considers age and sex rather than relying on the fixed adult categories.
This calculator is provided for informational and educational purposes only. BMI is a screening measure and is not a diagnosis or substitute for professional medical evaluation.