US Navy Body Fat Calculator
Estimate your body fat percentage quickly and accurately using the US Navy Body Fat Calculator. This scientifically validated method evaluates neck, waist, height, and hip measurements (for women) to provide a precise body composition assessment. Unlike BMI, it distinguishes between lean mass and fat mass, making it ideal for fitness enthusiasts, military applicants, or anyone tracking health goals.
| Fat percentage (BFP) | — % |
| Fat mass (FM) | — kg |
| Fat free mass (LM) | — kg |
How the US Navy Body Fat Calculator Works
Hodgdon and Beckett developed the US Navy body fat calculator formula at the Naval Health Research Center (NHRC). Using simple body measurements, it estimates body fat percentage accurately without expensive lab tests.
- Men: Requires height, neck, and waist measurements
- Women: Requires height, neck, waist, and hip measurements
US Navy Body Fat Calculator Formulas
Men:
% Body Fat = 86.010 × log10(waist − neck)
− 70.041 × log10(height)
+ 36.76
Women:
% Body Fat = 163.205 × log10(waist + hip − neck)
− 97.684 × log10(height)
− 78.387
This US Navy body fat percentage calculator formula has an accuracy of approximately 3–4%, providing reliable results for fitness tracking and military readiness.
How to Take Accurate Measurements
To maximize the accuracy of your Navy body fat measurement, follow these steps:
- Neck: Measure just below the Adam’s apple
- Waist (Men): Measure at the navel
- Waist (Women): Measure at the narrowest point
- Hips (Women): Measure at the widest point
- Height: Stand barefoot, upright, with a straight posture
Keep the measuring tape snug but not tight, and maintain a relaxed position for consistency.
US Navy Body Fat Standards
| Age Group | Men (%BF) | Women (%BF) |
|---|
| 18–21 | 22% | 33% |
| 22–29 | 23% | 34% |
| 30–39 | 24% | 35% |
| 40+ | 26% | 36% |
Body Fat Categories
| Category | Men (%BF) | Women (%BF) |
|---|---|---|
| Essential Fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fit | 14–17% | 21–24% |
| Acceptable | 18–25% | 25–31% |
| Obese | 26%+ | 32%+ |
These tables follow the US Naval Body Fat Chart and help track fitness, health risks, and military readiness.
Why Use the US Navy Method Body Fat Calculator?
- Accurate and reliable: Validated method with ~3–4% error
- Better than BMI: Distinguishes fat from lean tissue
- Practical and convenient: No equipment needed, can be done anywhere
- Supports fitness goals: Helps track fat loss, muscle gain, and overall health
- Military readiness: Essential for Navy or armed forces applicants
Tips for Reducing Body Fat
- Perform 30–45 minutes of cardio daily
- Prioritize protein-rich foods
- Avoid processed foods and sugar
- Stay hydrated and well-rested
- Track waist, neck, and hip measurements monthly