Enter your measurements into the calculator to estimate your body fat percentage using the U.S. Navy circumference method. For women, this method also requires hip circumference. Use inches (in); if you have centimeters, convert first (1 in = 2.54 cm).

Navy Body Fat Formula

The U.S. Navy circumference method uses different equations for men and women. These standard constants are intended for measurements in inches and use log₁₀ (base-10 logarithm).

Men: BF = 495 / ( 1.0324 – 0.19077 * log10( w – n ) + 0.15456 * log10( h ) ) – 450
Women: BF = 495 / ( 1.29579 – 0.35004 * log10( w + hip – n ) + 0.22100 * log10( h ) ) – 450

Where BF is the estimated body fat percentage
w is waist circumference (inches)
hip is hip circumference (inches, women only)
n is neck circumference (inches)
h is height (inches)

Navy Body Fat Definition

Navy Body Fat commonly refers to the U.S. Navy’s circumference method for estimating body fat percentage. This method estimates body fat using height and a small set of body circumference measurements (for men: neck and waist/abdomen; for women: neck, waist, and hips).

In the Navy, this estimate is used as part of the Body Composition Assessment (BCA) within the Physical Readiness Program to help determine whether personnel meet body composition standards. The allowable (maximum) body fat percentage depends on age and sex, but age is not part of the calculation formula itself.

As with any tape-measure-based method, results are an estimate and can be affected by measurement technique. If you need a clinical measurement of body composition, consider laboratory methods or consult a qualified professional.

Navy Body Fat Requirements

Age 18 to 21 – 22% for males, 33% for females;
Age 22 to 29 – 23% for males, 34% for females;
Age 30 to 39 – 24% for males, 35% for females;
Age over 40 – 26% for males, 36% for females.
Note: official standards can change; consult current U.S. Navy policy for the latest requirements.

How to calculate Navy Body Fat?

How to calculate navy body fat?

First, measure waist circumference.
Measure your waist.
Next, measure your neck circumference.
Measure your neck.
If female, measure your hip circumference.
Measure your hips (required for women).
Next, determine your height.
Measure your overall height.
Calculate your Navy Body Fat.
Use the appropriate equation (men or women) to calculate your navy body fat.

Frequently Asked Questions

What is the significance of measuring body fat percentage?
Measuring body fat percentage is useful for assessing body composition and tracking changes over time. Higher body fat levels are associated with increased risk for several health conditions, though body fat percentage is only one part of an overall health assessment.

Why does the Navy use its own body fat formula?
The Navy uses a standardized circumference-based method so measurements can be collected consistently and compared against Navy body composition standards. The equations differ for men and women (women also use hip circumference).

Can civilians use the Navy Body Fat formula for their personal fitness goals?
Yes, civilians can use the Navy Body Fat formula as a convenient method to estimate their body fat percentage. It can be a useful tool for those looking to monitor their fitness progress or maintain a healthy body composition.

How often should one measure their body fat percentage?
The frequency of measuring body fat percentage can vary based on individual fitness goals and needs. However, for those actively trying to change their body composition, measuring every 4-6 weeks can provide useful insights into their progress.

Navy Body Fat Calculator (Men)