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Body Fat Calculator — Measure Your Body Fat Percentage

Body Fat Calculator — Measure Your Body Fat Percentage | Free Online Tool

Calculate Your Body Fat % Instantly

How Is Body Fat Calculated?

This calculator uses two scientifically validated methods to estimate body fat percentage:

🔵 Navy Method Formula

Developed by the U.S. Navy, this method uses body circumference measurements and is considered more accurate than BMI-based estimates.

For Men:
BF% = 495 ÷ (1.0324 − 0.19077 × log₁₀(waist − neck) + 0.15456 × log₁₀(height)) − 450
For Women:
BF% = 495 ÷ (1.29579 − 0.35004 × log₁₀(waist + hip − neck) + 0.22100 × log₁₀(height)) − 450

All measurements in centimeters.

🟠 BMI Method Formula

This method estimates body fat from BMI, age, and gender. It is less precise than the Navy method but requires only height and weight.

For Men: BF% = (1.20 × BMI) + (0.23 × Age) − 16.2
For Women: BF% = (1.20 × BMI) + (0.23 × Age) − 5.4
BMI = Weight (kg) ÷ Height (m)²

Body Fat Percentage Categories

CategoryMenWomen
Essential Fat2–5%10–13%
Athlete6–13%14–20%
Fitness14–17%21–24%
Average18–24%25–31%
Obese25%+32%+

How to Use This Calculator

  1. Select Method: Choose Navy Method (more accurate) or BMI Method (simpler).
  2. Select Unit: Choose Metric (cm/kg) or Imperial (ft/lbs).
  3. Enter Basic Info: Input your age, gender, height, and weight.
  4. Enter Measurements (Navy only): Add your waist, neck, and hip (women) measurements.
  5. Click Calculate: Your body fat percentage, fat mass, lean mass, and category will appear instantly.

⚠️ Disclaimer

This Body Fat Calculator provides estimates only and is intended for general informational purposes. Results are based on mathematical formulas and may not reflect your actual body composition. This tool is not a substitute for professional medical advice. For accurate body fat measurement, consult a healthcare provider or use clinical methods such as DEXA scan or hydrostatic weighing.

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