Health & Fitness
Body Fat Calculator
Use this body fat calculator for an educational estimate from tape measurements. It is not a clinical body composition test.
Body fat estimate
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- Fat mass per 100 lb
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the body fat calculator solves
Use this body fat calculator for an educational estimate from tape measurements. It is not a clinical body composition test.
Formula
How to use it
- Choose formula sex.
- Enter height and circumference measurements in inches.
- Read the estimated body fat percentage.
How to read the answer
The estimate is useful for tracking trends when measurements are consistent.
Common mistakes and edge cases
- Do not pull the tape too tight.
- Measure at consistent anatomical points.
- This is not a DEXA, BodPod, or clinical assessment.
Worked examples
Male estimate
Body fat estimate
17.5%
Female estimate
Body fat estimate
31.1%
Frequently asked questions
How accurate is the Navy method?+
It is convenient but imperfect. It is best for consistent trend tracking.
Why does hip measurement show for female formula?+
The Navy female equation includes hip circumference.
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Last updated: May 8, 2026