Body Fat Calculator

This calculator uses the authoritative U.S. Navy formula. No professional calipers or special instruments are required—just a simple tape measure is enough to scientifically estimate your body fat percentage. In addition to body fat %, we also calculate your Body Fat Mass and Lean Body Mass, helping you track your fitness progress comprehensively.

How to Use the Body Fat Calculator

1. Set Basic Information: Choose your preferred unit system (Metric cm/kg or Imperial ft/lbs) and your gender.
2. Enter Measurements: Accurately measure and enter your height, weight, neck, and waist circumference. Note: Females need to provide an additional hip measurement to account for gender-specific body fat distribution.
3. View Results: Click the “Calculate” button. The results section will display your Body Fat Percentage, Body Fat Mass, and Lean Body Mass. Check the table below to see which category your metrics fall into.

Definition of Inputs

For the best accuracy, use a soft flexible tape measure and ensure it is level. Avoid compressing the skin with clothing while measuring.

• Gender: Men and women have different body compositions, so the formula adjusts accordingly. Please select the correct gender.
• Weight and Height: Your total body weight and height are critical variables for the body fat formula, so please ensure they are accurate.
• Circumference Measurements (Neck, Waist, Hip): These allow us to estimate body fat distribution. Measure neck below the larynx, waist at the navel for men (or narrowest point for women), and hips (women only) at the widest part of the buttocks.

Understanding the Results

• Body Fat Percentage: The percentage of your total weight that is composed of fat. This is a better indicator of fitness than BMI. A range of 10-20% for men and 18-28% for women is generally considered healthy.
• Body Fat Mass: The actual weight of fat tissue in your body. When losing weight, your goal is to lower this number while keeping your lean mass stable.
• Lean Body Mass: Your total weight minus fat weight. Think of this as your body's “Metabolic Engine”. It consists of muscle, bone, and organs. Preserving lean mass (especially muscle) is key to boosting metabolism and preventing weight rebound.

Body Fat Percentage Categories

Important Disclaimer