Online BMI Calculator for
Calculating Body Mass Index

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Explains what BMI is, and helps you to determine body mass index using your height and weight in either standard or metric measurements.

This online BMI calculator will help you to calculate your body mass index.

What is Body Mass Index?

Body mass index (BMI), which is based on height and weight, is simple estimate of body fat that is a good indicator of your risk for certain diseases such as heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers.

Body mass index calculations are often used to determine whether a person is overweight, obese, underweight or normal (see the BMI body mass index chart located below the calculator). It is designed for males and females from age 18 to age 65, but does have its limitations.

Please also note that BMI tends to overestimate body fat for athletes and body builders, and tends to understate body fat for older people who have lost muscle mass.

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So with that, let's use the online BMI calculator for calculating body mass index.

Calculate Body Mass Index
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Instructions: Choose Standard or Metric, enter your corresponding height and weight measurements, then click the "Calculate BMI" button.

Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the Online BMI Calculator.

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Help Your height in inches (ft. in.):
Help Your weight in pounds:
Your Body Mass Index:
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Online BMI Calculator Glossary of TermsCalcy magnifying glass

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BMI: A simple estimate of body fat that is a good indicator of your risk for certain diseases such as heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers. Calculating your Body Mass Index is a much easier way to estimate body fatness than trying to perform a skinfold thickness test.

Over and Under Estimation: The calculation of body mass index tends to overestimate body fat for athletes and body builders, and tends to understate body fat for older people who have lost muscle mass.

Interpreting Your Body Mass Index: The weight status associated with various body mass index ranges are shown in the following chart.

BMI/Body Mass Index Chart
BMI Weight Status
Body fat index less than 18.5 Underweight
Body fat index from 18.5 to 24.9 Normal
Body fat index from 25.0 to 29.9 Overweight
Body fat index of 30.0 and Over Obese

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