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Free BMI Calculator

A free BMI calculator is provided in the following article to assist you in obtaining an accurate measurement of your body mass index. Although BMI does not measure body fat directly, it correlates closely to direct measures of body fat in most people. Using this free calculator can help you better understand your risk for various weight-related health problems.

Free BMI Calculator: An Introduction

Research has proven that body fatness can be assessed through a simple measurement called body mass index (or BMI for short). BMI isn't a direct measure of body fatness, but it does correlate closely to direct measures of body fat in most people.
The free BMI calculator provided in this article can be used to determine body mass index for adults 20 years of age and older.
For adults, BMI is interpreted through categories that do not take factors such as sex or age into account.

BMI Calculator for Adults

To use the free BMI calculator for adults, enter your weight and height using English or metric units of measurement. Click "Calculate," and your BMI will appear.

Understanding the Results Generated by the BMI Calculator

For adults 20 years old and older, the free BMI calculator results are interpreted using standard weight status categories that are the same for both men and women. The standard weight status categories associated with BMI ranges for adults are shown in the following table.
Weight Status
Below 18.5
18.5 - 24.9
25.0 - 29.9
30.0 and above
Remember: BMI is just one measure to assess the risk associated with weight.
(Click BMI and Weight to learn more about other factors doctors consider when determining risks for certain medical conditions related to weight.)
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