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Body Fat Calculator
The Body Fat Calculator estimates body fat percentage using the US Navy method with circumference measurements in centimeters. It supports formulas for men and women.
📊Results
⚙️How it works
The calculator applies gender-specific logarithmic formulas using height and body circumferences.
Related calculators: BMI Calculator, Calorie Needs Calculator, Sleep Calculator.
🧮Formula
Men: BF% = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76; Women: BF% = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387
Worked example: body fat estimate workflow
Using standardized body measurements, the calculator estimates body fat percentage and supports trend tracking across training blocks.
Interpretation notes
Use consistent measurement timing and method. Inconsistent measurements can create fake progress or regression signals.
❓FAQ
Do I need hip measurement for men?
No. Hip is only required for women in this formula.
Can I use inches?
This version expects centimeters for all measurements.
Is this a diagnosis?
No. It is an estimate for informational use.
Practical context for this calculator
Best use cases
- Apply this body fat calculation before committing to a decision.
- Compare multiple what-if scenarios by changing one variable at a time.
- Keep a small log of your inputs and outputs to validate consistency over time.
Result quality checklist
- Verify units, time period, and baseline assumptions before interpretation.
- Review rounding and decimal precision for your decision context.
- Cross-check with a related calculator when the outcome impacts money or health.
Practical guide and high intent terms
This online calculator is designed for fast, accurate, and easy to verify results. To improve output quality, validate your base value, unit, and scenario assumptions before interpreting the number. For finance, health, study, and work tasks, a reliable calculator helps reduce manual errors and supports better decisions.
For deeper analysis, compare this result with BMI Calculator Calorie Needs Calculator and test multiple input scenarios to reach a stronger conclusion.