Body Fat Percentage (BFP) Calculator

This on-line BFP calculator takes your gender, age, weight and height and calculates the percentage of fat in the body. The formula used is based on BMI. This will give an approximate result.

Using the BFP calculator

1. Select your Gender.
2. Enter your Age.
3. Enter your Height either in centimeters or in feet.
4. Enter your Weight either in kilogram (kg) or in pounds (lb.).
5. Then, click the Calculate BFP button. The body fat percentage will be calculated and the result will be displayed in the box below the button.

Body Fat Percent is calculated by dividing the total weight of the fat divided by the body weight. Every human needs to have a certain amount of essential fat. The essential fat percent varies hugely between women and men. Below is a chart of body fat percent ranges for women and men.

Formula

There are several formulas used for calculating body fat percentage. This calculator uses the formula based on BMI. For people with high muscle mass or pregnancy, this BMI based calculator may give inaccurate result. For others, this will give an approximate result.

BFP Formula for Children

BFP = (1.51 * BMI) - (0.70 * Age) - (3.6 * S) + 1.4

Where:

• S = 1 for male and 0 for female.
• BMI = Body Mass Index.
• Age = Age in years.

BFP Formula for Adults

This BF% formula is based on the heritage study The effect of sex, age and race on estimating percentage body fat from body mass index: The Heritage Family Study.

BFP = (1.39 * BMI) + (0.16 * Age) - (10.34 * S) - 9

Where:

• S = 1 for male and 0 for female.
• BMI = Body Mass Index.
• Age = Age in years.

Fat Percent Category

• Body mass index as a measure of body fatness: age- and sex-specific prediction formulas by Cambridge University
• The effect of sex, age and race on estimating percentage body fat from body mass index: The Heritage Family Study
• About Body Fat Percentage at wikipedia.org