# Body Fat Calculator (US Navy) Calculate body fat percentage using the US Navy method > Canonical page: https://elysiatools.com/en/tools/body-fat-calculator-us-navy - **Category:** Health - **Keywords:** body fat, calculator, us navy, fitness, health, body composition, fat percentage ## Overview The US Navy Body Fat Calculator provides a reliable way to estimate your body fat percentage using simple body circumference measurements. By utilizing height, neck, waist, and hip measurements, this tool offers a practical alternative to more complex body composition analysis methods. ## Inputs - **Gender** (select) - **Waist Circumference (cm)** (number): Enter waist circumference - **Neck Circumference (cm)** (number): Enter neck circumference - **Height (cm)** (number): Enter your height - **Hip Circumference (cm) - Female only** (number): Enter hip circumference (for females) ## When to use - When tracking body composition changes during a fitness or weight loss program. - When you want a quick, non-invasive estimate of body fat without specialized equipment. - When you need a standardized metric for personal health monitoring based on established military formulas. ## How it works - Select your gender to determine the required measurement fields. - Enter your height and neck circumference in centimeters. - Input your waist circumference; if female, also provide your hip circumference. - Submit the data to receive an estimated body fat percentage based on the US Navy algorithm. ## Use cases - Monitoring progress for individuals following a structured strength training or fat-loss regimen. - Establishing a baseline for personal health and wellness goals. - Comparing body composition trends over time to adjust diet and exercise intensity. ## Frequently asked questions ### How accurate is the US Navy method? It is a widely used estimation tool that provides a reasonable approximation, though it may vary compared to clinical methods like DEXA scans. ### Why do I need to enter my neck circumference? The US Navy formula uses neck circumference as a proxy for lean muscle mass in the upper body to improve the accuracy of the fat percentage calculation. ### Is this calculator suitable for everyone? It is designed for general fitness tracking. Individuals with extreme muscle mass or specific medical conditions may find the results less representative. ### Should I measure in inches or centimeters? This specific tool requires all measurements to be entered in centimeters. ### How often should I measure my body fat? For consistent tracking, it is recommended to measure once every two to four weeks under similar conditions, such as first thing in the morning. ## Related tools - [Baseball Statistics Calculator](https://elysiatools.com/en/tools/baseball-stats): Calculate baseball batting statistics including batting average and on-base percentage - [BMI Calculator](https://elysiatools.com/en/tools/bmi-calculator): Calculate Body Mass Index (BMI) and get health category recommendations - [Ideal Weight Calculator](https://elysiatools.com/en/tools/ideal-weight-calculator): Calculate ideal body weight based on height, gender, and formula - [Bioavailability Calculator (F = AUC_po · Dose_iv / AUC_iv · Dose_po)](https://elysiatools.com/en/tools/bioavailability-calculator): Calculate the absolute bioavailability F of an extravascular (typically oral) dose: F = (AUC_po · Dose_iv) / (AUC_iv · Dose_po), where AUC_po and AUC_iv are the areas under the concentration-time curve after oral and IV dosing, and the doses correct for any difference in amount administered. F is dimensionless and lies in \[0, 1\]; IV bioavailability is by definition 1, while oral F < 1 reflects incomplete absorption and/or first-pass metabolism. AUC can be in any consistent unit (e.g. mg·h/L) since it cancels out of the ratio. Valid only for linear pharmacokinetics, the same drug molecule, and doses within the linear range. 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