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Body Fat Calculator

Unit
Gender
Age:
years
Height
feet
inch
Height
cm
Weight
pound
Weight
kg
Values after this point are optional

Input Neck Circumference measured just below the level of larynx.

feet
inch

Input Neck Circumference measured just below the level of larynx.

cm

Input Waist Circumference measured around your trunk right above your hipbones while exhaled and without pulling in your stomach.

feet
inch

Input Waist Circumference measured around your trunk right above your hipbones while exhaled and without pulling in your stomach.

cm

Input Hip Circumference.

feet
inch

Input Hip Circumference.

cm
Calculator Description

Body fat calculator will calculate the body fat percetage based on US Navy army body calculation method for you based on your height, age and gender. We also calcualte the healthy weight range based on BMI value. For adult, the healthy BMI value is in the range of 18.5 to 25. For age from 2 to 20, the healthy BMI range is calculated based on BMI percentile. The healthy BMI percentile range is 5% to 85%.

Related Link
Fitness ALL BMI Calorie BMR Ideal Weight
How to Calculate Body Fat Percentage(BFP)
If the sizes of Waist, Neck and Hip are available, the U.S. Navy method will normally generate a better result. The U.S. Navy method is based on this formula:
  • For Men BFP = \[ \frac{495}{1.0324 -0.19077log(W - N) + 0.15456log(He)} - 450 \]
  • For Women BFP = \[ \frac{495}{1.29579 -0.35004log(W +Hip - N) + 0.221log(He)} - 450 \]
Where W is Waist, N is Neck, and He is Height. This formula is based on the metric units that is in cm. For US units, we will convert it into metric firstly and then apply the formula. Otherwise, the BMI based body fat percentage formula is used:
  • Body fat percentage (BFP) formula for adult males: \[ BFP = 1.20 \times BMI + 0.23 \times Age - 16.2 \]
  • Body fat percentage (BFP) formula for adult males: \[ BFP = 1.20 \times BMI + 0.23 \times Age - 16.2 \]
  • Body fat percentage (BFP) formula for adult females: \[ BFP = 1.20 \times BMI + 0.23 \times Age - 5.4 \]
  • Body fat percentage (BFP) formula for boys: \[ BFP = 1.51 \times BMI - 0.70 \times Age - 2.2 \]
  • Body fat percentage (BFP) formula for girls: \[ BFP = 1.51 \times BMI - 0.70 \times Age + 1.4 \]
Body Fat References
Description Women Men
Recommended amount 20% - 25% 8% - 14%
Adults in US, average 22% - 25% 15% - 19%
Obese 30% and above 25% and above
American Council on Exercise BFP category table
Description Women Men
Essential fat 10% - 13% 2% - 5%
Athletes 14% - 20% 6% - 13%
Fitness 21% - 24% 14% - 17%
Average 25% - 31% 18% - 24%
Obese 32% and above 25% and above
Age Adjusted Ideal Body Fat Percentages
AgeWomenMen
2017.7%8.5%
2518.4%10.5%
3019.3%12.7%
3521.5%13.7%
4022.2%15.3%
4522.9%16.4%
5025.2%18.9%
5526.3%20.9%