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📏 Body Fat Calculator

Estimate your body fat percentage using the US Navy Method (circumference measurements) or the BMI Method. Get your fat mass, lean mass, and fitness category instantly.

Formulas Used

US Navy Method
Male: 495 / (1.0324 − 0.19077×log₁₀(waist−neck) + 0.15456×log₁₀(height)) − 450
Female: 495 / (1.29579 − 0.35004×log₁₀(waist+hip−neck) + 0.22100×log₁₀(height)) − 450
BMI Method (Deurenberg)
Male: (1.20 × BMI) + (0.23 × age) − 16.2
Female: (1.20 × BMI) + (0.23 × age) − 5.4

How to Use This Calculator

  1. 1
    Select Gender
    Body fat standards differ significantly between males and females.
  2. 2
    Choose a Method
    The Navy method uses circumference measurements; BMI method uses height, weight, and age.
  3. 3
    Enter Measurements
    Use a flexible tape measure at the correct body landmarks for the most accurate result.
  4. 4
    Review Your Category
    See your body fat % alongside its fitness classification — Essential, Athletic, Fitness, Average, or Obese.

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