Body Fat Calculator

Calculate your body fat percentage using the US Navy method.

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Features

US Navy Standard Formula

Utilizes the official U.S. Navy circumference method, known for its high accuracy in estimating body composition.

Tailored for All

Specific algorithms for Men and Women that account for biological differences in fat distribution.

Comprehensive Analysis

Go beyond just a percentage—get a breakdown of your Total Fat Mass and Lean Body Mass (Muscle & Bone).

Visual Health Categories

Instantly understand your results with recognized categories: Essential Fat, Athletes, Fitness, Average, and Obese.

Metric & Imperial Support

Seamlessly switch between cm/kg and in/lbs to use the measurements you are most comfortable with.

Privacy Focused

All calculations happen in your browser. Your personal body measurements are never sent to a server.

About Body Fat Calculator

Our Body Fat Calculator uses the highly regarded U.S. Navy Method to provide a precise estimate of your body fat percentage. Unlike simple BMI calculations that only consider height and weight, this tool takes into account your body circumference measurements (neck, waist, and hip) to differentiate between muscle and fat. This method is widely used by military organizations and fitness professionals as a reliable, non-invasive way to track body composition changes. Whether you are cutting, bulking, or maintaining, understanding your body fat percentage is crucial for setting realistic fitness goals and monitoring your true progress.

How to Use Body Fat Calculator

  • 1
    Choose Your Details

    Select your Gender (Male/Female) and preferred Unit system (Metric/Imperial).

  • 2
    Measure Correctly

    For better accuracy, measure your Neck (below larynx), Waist (at navel), and Hips (widest part, females only).

  • 3
    Input Values

    Enter your Age, Weight, Height, and the measured circumferences into the respective fields.

  • 4
    Get Your Results

    Instantly view your calculated Body Fat %, Fat Mass, Lean Mass, and Health Category.

Frequently Asked Questions

It is a widely accepted, non-invasive way to estimate body fat using simple tape measurements rather than expensive laboratory equipment.
It generally provides a good estimate (within 3-4%) compared to more expensive gold-standard methods like DEXA scans or hydrostatic weighing.
It serves as a baseline for lean mass. Generally, a larger neck relative to the waist indicates higher muscle mass.
For consistency, measure in the morning after waking up and before eating or exercising, as hydration levels can affect body circumference.
No, 'perfect' depends on your goals (e.g., bodybuilding vs. general health). Essential fat is 2-5% for men and 10-13% for women.
The US Navy method is designed for adults. Body composition in children is highly variable and should be assessed by a pediatrician using growth charts.