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Free Body Fat Calculator

Body Fat Calculator

Body Fat Calculator

Uses the US Navy formula (All measurements must be in **inches**).

Step By Step Process For Free Body Fat Calculator

1) Purpose & Overview

Explain to users:
“Estimate your body fat percentage to better understand your fitness level, track progress, and set health goals.”

 

2) Collect User Inputs

 

Ask users to provide the following:

 

  • Age (in years)
  • Sex (Male, Female, or Other)
  • Weight (kg or lb, with unit toggle)
  • Height (cm or ft+in, with unit toggle)
  • Optional advanced inputs:
    • Waist circumference
    • Hip circumference
    • Neck circumference
    • Wrist circumference (for some formulas)
    • Body fat measurement method (US Navy, BMI-based, skinfold estimates)

 

3) Input Validation

 

  • Ensure all required fields are filled.
  • Check realistic value ranges (e.g., height 50–250 cm, weight 20–500 kg).
  • Display user-friendly errors for invalid entries: “Please enter a valid weight and height.”
  •  

4) Choose Calculation Method

 

  • US Navy Method – uses neck, waist, hip measurements
  • BMI-based estimate – uses BMI, age, and sex for approximate body fat
  • Skinfold estimate (optional) – if skinfold measurements are available

 

5) Optional Goal Adjustment

 

  • Allow users to enter fitness goals:

    • Reduce body fat
    • Maintain body fat
    • Increase muscle mass
  • Provide suggestions or guidance based on the user’s results.

 

6) Display Results

 

Present results clearly, including:

 

  • Body fat percentage (%)
  • Category/interpretation (based on fitness standards):
    • Essential fat
    • Athletes
    • Fitness
    • Average
    • Obese
  • Optional: Lean mass vs fat mass
  • Optional: healthy target body fat range for age and sex

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