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Fact Checked
This article was written by one of our qualified writers, and fact-checked by our experts. The numbers in parentheses (e.g. 1, 2, 3, etc.) throughout the article, are reference links to peer-reviewed studies.
Our team of experts include a board-certified physician, nutritionists, dietitians, certified personal trainers, strength training experts, and exercise specialists.
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Body Fat US Navy Calculator

Determine your body fat percentage using a formula developed for the U.S. Navy.

Matthew Magnante

Written by Matthew Magnante

Updated by Dr. Steven Griffin

Last Updated onMarch 7, 2022

US Navy Calculator

US Navy Calculator

Use the Body Fat US Navy Calculator to estimate your body fat percentage based on your gender, height, weight, and waist and neck size. 

This tool uses the US Navy formula to determine body composition or fat to lean body tissue ratio. 

Weight in Pound
Height in Feet
Height in Inches

Measurements - US Navy Formula

Navel in Inches
Hip in Inches
Neck in Inches

Calculating result please wait..

If you would like to use this calculator on your website or blog you can simply embedded this calculator in one click. Use the below 'Generate Code' tool to get the embedded code.

Copy the below code and paste it in your web page in HTML format anywhere between <body> start and </body> end tag.

What is The Body Fat US Navy Calculator?

As the name suggests, this tool is based on the US Navy developed formula that measures body fat and body composition based on personal stats such as gender, height and weight, and waist and neck size. 

Military including Navel forces recruits are required to meet certain body composition standards as part of the terms for enlistment.

Body fat to lean tissue ratio may predict health and fitness. A high body fat percentage is often associated with being overweight, obese, out of shape, and/or prone to health risks. 

The good news is anyone can improve their body composition by hitting the weights and changing up their diet and overall lifestyle a little. 

Try these body composition exercises to build more muscle and shed fat. 

The Most Accurate Method For Measuring Body Fat

While the body fat US Navy calculator can give you a reasonable body fat and body composition estimate, it’s not the most accurate, however, it is one of the most convenient and gets close enough for the armed forces to use it. 

It’s also important to mention that even more advanced methods may not give you 100% accurate measurements but they can get very close and are pretty reliable. 

Skinfold measurements, body fat scales, and other portable and handheld devices are typically the least accurate methods of determining body fat and composition. 

The most accurate methods such as hydrostatic weighing and DEXA/DXA scan are more expensive to have done and require you to visit a facility that offers these more advanced technologies. 

While not as accurate but certainly acceptable, our body fat calculator is a very good and free-to-use option. You don’t need any tools but there are options to use a caliper for more accuracy or a measuring tape (not as accurate). 

It does require a little more effort and details but it should give you a closer estimate of fat to lean tissue ratio and you can compare your results to the body fat US Navy calculator tool.   

How To Use The Body Fat US Navy Calculator

While the calculator is rather straightforward to use, it’s important to ensure you provide accurate information to get the best result possible. 

The best time to weigh yourself and take your waist and neck measurements is first thing upon waking after you’ve used the bathroom and before eating or drinking anything. 

Step 1: Choose the desired unit of measurement: Imperial (pounds, feet, and inches) or metric (kilograms, meters, and centimeters). 

Step 2: Choose the gender

Step 3: Enter your current weight and height

Step 4: Enter waist measurements at the navel (belly button) for men and right above the navel for women. 

Step 5: Enter neck measurement (Narrowest part of the neck below the larynx)

Step 6: Enter hip measurement at the widest (only for Female)

Step 7: Hit Calculate!

Analyzing Your Results

The calculator will display estimates of your body fat percentage, fat mass in pounds/kg, lean mass in pounds/kg, and “fat category”.

So, for example, if you’re a 5’10 male who weighs 142 lbs and has a 32-inch waist and 14-inch neck, your results will look like the following. 

  • Body fat: 15 (%)
  • Fat mass: 21 (pounds)
  • Lean mass: 121 (pounds)
  • Fat category: Fit

So based on your results, you have 15% body fat, 21 pounds of fat mass, 121 pounds of lean mass (muscles, bone, organs, etc), and you’re considered a fit individual. 

How To Take Waist and Neck Measurement

While this part should not be difficult, many times it’s frustrating trying to get an accurate measurement. 

Waist

Men should measure the waist at the navel which is also known as the belly button. For women, the narrowest part of the waist is usually right above the belly button.

To get a good measurement, stand up straight, take a normal breath and either get someone to take your measurement or use a mirror to do it yourself.

Neck 

Measure the narrowest part of the neck, typically below the larynx also known as the Adam’s apple. 

Hip

Your hip measurement at its widest point.

Body Fat US Navy Formula 

This handy tool uses a different formula compared to our other body fat calculator. Below we’ve included the body fat US Navy formulas for both men and women. 

Men’s formula

%BF = 495 / ( 1.0324 – 0.19077 * log10( waist – neck ) + 0.15456 * log10( height ) ) – 450

Women’s formula

%BF = 495 / ( 1.29579 – 0.35004 * log10( waist + hip – neck ) + 0.22100 * log10( height ) ) – 450

US Navy Body Fat Standards

Below we’ve provided the body fat limits for both men and women. Note: The following figures are what we could find regarding the Navy standards and is reflective of the requirements at some point.

  • 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.

Body Fat Categories Table

The Body Fat Range for each Classification shows how close your calculated Body Fat Percentage is to the next Body Fat Classification range.

Category Women (% fat) Men (% fat)
Essential Fat 10%-13% 2%-5%
Athletic 14%-20% 6%-13%
Fit 21%-24% 14%-17%
Acceptable 25%-31% 18%-25%
Obese 32% + 26% +

Related Calculators:

We also encourage you to check out our other awesome calculators to help you reach your health, fitness, and performance goals.

  • Body Fat Skinfold Calculator
  • 3 Skinfold Body Fat Calculator
  • 4 Skinfold Body Fat Calculator
  • 7 Skinfold Body Fat Calculator
  • Grecian Ideal Calculator
  • Body Fat Calculator: Find Your Body Fat Percentage
  • Calories Burned Weight Lifting
  • Body Type Quiz
  • Body Surface Area Calculator
  • Calorie Deficit Calculator

Are You US Navy Fit?

The Body fat US Navy calculator is convenient and easy to use whether you plan on serving in the US Navy or you simply want to measure your body fat percentage and body composition using this free tool. 

While it may not be as precise compared to other body fat measuring methods, it doesn’t take much effort aside from hopping on the scale and measuring your waist and neck size. 

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Matthew Magnante

Matthew Magnante

Matthew has had a passion for fitness since elementary school and continues to research and learn how to build muscle effectively through training and diet. He also loves to help others to achieve their fitness goals and spread the knowledge where needed. Matthew's other passions include learning about mindfulness, strolling through nature, and always working to improve overall.

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