Body Fat Calculator

Free & Private Body Fat Calculator

Our Body Fat Calculator is a free tool designed to help you estimate your body fat percentage using simple body measurements. Because all calculations are performed directly in your browser, your personal data is never saved or sent to a server. Your privacy is 100% guaranteed.

Understanding your body composition the ratio of fat mass to lean mass is a more accurate indicator of health and fitness than weight alone. This tool provides a reliable estimate to help you track your progress.

How It Works

The calculator uses a scientifically-recognized formula that relies on specific body measurements to estimate body composition. The formula is gender-specific, which is why it requires different measurements for men and women to ensure a more accurate result. Simply enter your details, and our tool does the rest.

Key Features

• Gender-Specific Calculations: The tool uses distinct formulas for males and females for improved accuracy.
• Metric & Imperial Units: Easily switch between centimeters/kilograms and inches/pounds.
• Comprehensive Results: Get more than just a percentage. See your estimated Fat Mass and Lean Mass in kg or lbs.
• Visual Health Gauge: An animated gauge provides a quick, visual representation of your body fat percentage.
• Health Category Breakdown: Instantly see how your result compares to established fitness categories like 'Athletes', 'Fitness', and 'Acceptable'.
• Completely Private: All calculations happen on your device. Your data is never recorded or uploaded.
• Light & Dark Mode: Choose a theme for your comfort.

How to Use the Calculator (Step-by-Step)

1. Step 1: Select Your Details
   Choose your gender (Male/Female) and your preferred unit of measurement (Metric/Imperial).
2. Step 2: Take Your Measurements
   Enter your height, weight, neck, and waist measurements. For female calculations, you will also need to provide a hip measurement.
3. Step 3: Get Your Results
   Click the "Calculate" button.
4. Step 4: Understand Your Body Composition
   The tool will display your body fat percentage on the gauge, along with your calculated Fat Mass, Lean Mass, and your general fitness classification.

Understanding the Body Fat Categories

Your body fat percentage is placed into a category to help you understand your general fitness level. These categories differ for men and women.

Find Our Tool

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