# Calculate Your Body Fat percentage

These Body Fat Percentage calculators use gender, height, weight and other measurements to calculate your percentage of body fat.

Measurement System
Pounds/Inches Kilograms/Centimeters

Gender
Male Female

Height
Weight
Waist circumference at the navel
Neck circumference at the collar

If female, also enter
Hip circumference at the widest point
Forearm circumference, unflexed
Wrist circumference

Body Mass Index (calculate your BMI)
Body Mass Index (BMI)
Age in years

## Hugo Rivera Formula

Men require two measurements: Bodyweight and Waist Circumference (measured at the belly button).

1. r1 = (Body weight x 1.082) + 94.42
2. r2 = Waist x 4.15
3. r3 = r1 - r2
4. r4 = (Weight - r3) x 100
5. Body Fat Percentage = r4 / Weight
Example: I weigh 185 and I have a 33 inch waist.
Step 1: (185 x 1.082) + 94.42 = 294.59
Step 2: 33 x 4.15 = 136.95
Step 3: 295.59 - 136.95 = 158.61
Step 4: (185 - 158.61) x 100 = 2639
Body Fat = 2639 / 185 = 14.26%

Women require five measurements: Body weight, Wrist Circumference, Waist Circumference, Hip Circumference, and Forearm Circumference.

1. r1 = Body weight x .732
2. r2 = r1 + 8.987
3. r3 = Wrist / 3.14
4. r4 = Waist x .157
5. r5 = Hips x .249
6. r6 = Forearm x .434
7. r7 = r2 + r3
8. r8 = r7 - r4
9. r9 = r5 - r8
10. r10 = r6 + r9
11. r11 = (Weight - r10) x 100
12. Body Fat Percentage = r11 / Weight
Example: A woman weighs 125 with a wrist measurement of 6, a waist measurement of 24, a hip measurement of 38, and a forearm measurement of 9.5:
Step 1: 125 x .732 = 91.5
Step 2: 91.5 + 8.987 = 100.487
Step 3: 6 / 3.14 = 1.91
Step 4: 24 x .157 = 3.768
Step 5: 38 x .249 = 9.462
Step 6: 9.5 x .434 = 4.123
Step 7: 100.487 + 1.91 = 102.397
Step 8: 102.397 - 3.768 = 98.629
Step 9: 98.629 - 9.462 = 89.167
Step 10: 4.123 + 89.167 = 93.29
Step 11: (125 - 93.29) x 100 = 3171
Body Fat = 3171 / 125 = 25.37%

## Navy Body Fat Calculation

The Navy body fat calculator uses body circumference measurements along with height to estimate body fat percentage. Measurements are taken at the narrowest point for waist and neck for males, and waist, neck and hips for females. These measurements are combined with your gender and height to estimate body fat percent. For most people, the Navy method is accurate to within 3%.

The formula for males (using inches):

Body Fat Percentage = Body Fat Percentage = 86.010 x log10(Waist - Neck) - 70.041 x log10(Height) + 36.76

The formula for females (using inches):

Body Fat Percentage = 163.205 x log10(Waist + Hip - Neck) - 97.684 x log10(Height) - 78.387

## BMI Based Calculation

Your Body Mass Index (BMI) can be used as a (very) rough rough indicator of body fat percentage. A British Journal of Nutrition study used the following equations to predict adult body fat percentages based on BMI:

For Men: (1.2 x BMI) + (.23 x Age) - 16.2

For Women: (1.2 x BMI) + (.23 x Age) - 5.4

A 2013 study in BMC Public Health showed a BMI calculation that included age and gender was as effective as some clinical measurements of body fat percentage in "average: individuals. However, it is notably inaccurate for individuals who have developed additional muscle mass through resistance training.

## Body Weight to Weight Lifted Ratio

Here's a nifty and new method for calcualting your percentage of body fat based on your height annd how much you can bench press and squat. This calcualtion was created by Reddit.com user who goes by the handle asuwere. His (surpsingly accurate for men) formula:

Body Fat Percentrage = 62.1 - 0.0691*Bench1RM(kg) - 0.0301*Squat1RM(kg) + 0.458*BodyWeight(kg) - 40.6*Height(m)

You can give this one a try by using the form below.

Measurement System
Pounds/Inches Kilograms/Centimeters

Height
Weight
1 Rep Max Bench Press
1 Rep Max Squat