Body fat calculator with steps — measurements & estimation methods

Step-by-step examples: estimate body fat using BMI-based approximation, Navy method, and verify category.

Tool

Use the main body-fat calculator for interactive calculations: Open body-fat calculator.

Examples

  1. BMI-based estimate
    Problem: weight = 80 kg, height = 1.8 m → BMI = 24.69
    1. Use approximation formula to estimate body-fat from BMI and age/sex.
    2. The calculator provides an estimated percent (varies by formula).
  2. Navy method (example)
    Problem: male waist = 90 cm, neck = 40 cm, height = 180 cm
    1. Compute body fat % using standard Navy formula implemented in the tool.
  3. Category interpretation
    Problem: Given calculated %BF = 22%, map to fitness category by sex and age.
    1. Use reference ranges to label as Healthy, Overweight, etc.

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