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1. Calculate Body Mass Index (BMI)Enter your height and weight then select the Calculate button. BMI helps determine the weight status of adults by measuring the ratio of weight compared to height. For adults over age 20, a BMI less than 18.5 specifies you are underweight, anything between 18.5 and 24.9 is healthy, values between 25 and 29.9 mean you are overweight, and values greater than or equal to 30.0 indicate obesity. Note: Athletes may have a higher than normal BMI due to muscle. Source: United States Centers for Disease Control and Prevention. | |
2. Calculate target heart rateEnter your age, then choose the number of seconds and select the Calculate button. Source: American Heart Association. | |
3. Calculate Body Fat PercentageEnter the measurements below, then select the Calculate button. Weightmania provides a more accurate version of this tool. Source: United States Navy and Air Force. | |
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More on Body Mass Index (BMI)
Body Mass Index (BMI) is a number calculated from a person's weight and height. BMI is a reliable indicator of body fatness for people. BMI does not measure body fat directly, but research has shown that BMI correlates to direct measures of body fat, such as underwater weighing and dual energy x-ray absorptiometry (DXA). BMI can be considered an alternative for direct measures of body fat. Additionally, BMI is an inexpensive and easy-to-perform method of screening for weight categories that may lead to health problems.
BMI Formula
weight (lb) / [height (in)]2 x 703
Calculate BMI by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by a conversion factor of 703.
Example: Weight = 150 lbs, Height = 5'5" (65")
Calculation: [150 / (65)2] x 703 = 24.96
BMI | Weight Status |
Under 19 | Underweight |
19 - 24 | Normal |
25 - 29 | Overweight |
30 - 39 | Obese |
40 or Over | Extemely Obese |
How reliable is BMI as an indicator of body fatness?
The correlation between the BMI number and body fatness is fairly strong; however it varies by sex, race, and age.
- At the same BMI, women tend to have more body fat than men.
- At the same BMI, older people tend to have more body fat than younger adults.
- Highly trained athletes may have a high BMI because of increased muscularity rather than fatness.
- Waist circumference (because abdominal fat is a predictor of risk for obesity-related diseases).
- Other risk factors for diseases and conditions associated with obesity (for example, high blood pressure or physical inactivity).
According to the BMI weight status categories, anyone with a BMI over 25 would be classified as overweight and anyone with a BMI over 30 would be classified as obese.
It is important to remember that BMI is not a direct measure of body fatness. BMI is calculated from an individual's weight, which includes both muscle and fat. As a result, some individuals may have a high BMI but not have a high percentage of body fat. For example, athletes may have a high BMI because of increased muscularity rather than increased body fatness. Although some people with a BMI in the overweight range (from 25.0 to 29.9) may not have excess body fatness, most people with a BMI in the obese range (equal to or greater than 30) will have increased levels of body fatness.
Remember, weight is only one factor related to risk for weight related diseases. If you have questions or concerns about the appropriateness of your weight, you should discuss them with your healthcare provider.
LA Weight Loss Body Mass Index (BMI) Tool
People come in all shapes and sizes. How can you tell if you are obese? Your bathroom scale alone can't tell you. According to the National Institutes of Health, the most accurate indicator of obesity is the Body Mass Index, or BMI.
Your BMI is a ratio of your weight and your height, and it's how most physicians determine obesity.
In general, this ratio should be between 20 and 26 (although people who are over 35 may be fine at a slightly higher number). If your BMI falls between 20 and 26, your height and weight are proportional, which is good.
Physicians consider people who are above the recommended BMI range for their age to be "obese." For example, someone who weighs 160 pounds and is 5' tall has a BMI of 31, which is considered obese. Someone who weighs 160 pounds and is 5'11" tall has a BMI of 22, which is within the optimal range.
Calculate your Body Mass Index | ||
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