How to Calculate your BMI with Charts

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BMI

Calculate Your BMI

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Body mass index is a measure of body fat based on height and weight that applies to adult men and women.

  • Enter your weight and height using standard or metric measures.
  • Select “Compute BMI” and your Body Mass Index will appear below.

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Standard Measurements View Metric Measurements
Your Height:
 
(pounds)

Body Mass Index Categories:
Underweight = <18.5
Normal weight = 18.5–24.9
Overweight = 25–29.9
Obesity = BMI of 30 or greaterThe Body Mass Index TablesAim for a Healthy Weight:
Limitations of the BMI
Assessing Your Risk
Controlling Your Weight
RecipesDownload the BMI calculator app today (available for iPhoneexternal disclaimer and Androidexternal disclaimer).

 

HOW TO CALCULATE YOUR BODY MASS INDEX 

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Body Mass Index is your weight (in kilograms) over your height squared (in centimeters). Let’s calculate, however, using pounds and inches.

For instance, the Body Mass Index of a person who is 5’3″ and weighs 125 lbs is calculated as follows:

  1. Multiply the weight in pounds by 0.45 (the metric conversion factor)
  • 125 X 0.45 = 56.25 kg

 

2. Multiply the height in inches by 0.025 (the metric conversion factor)

  • 63 X 0.025 = 1.575 m

 

3. Square the answer from step 2

  • 1.575 X 1.575 = 2.480625

 

4.Divide the answer from step 1 by the answer from step 3

  • 56.25 : 2.480625 = 22.7

 

The Body Mass Index for a person who is 5’3″ and weighs 125 lbs is 22.7 or practically, 23.

 

A healthy Body Mass Index ranges between 19 and 25.

The more sedentary your lifestyle, the closer your weight should be to the lower end of the recommended range. It is also important not to increase your weight significantly after age 18. Limit that weight gain to less than 11 pounds. The good news about this recommendation is that if you follow the exercise and dietary guidelines, it is much easier to maintain a healthy weight.

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