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Health Tools
Body Fat Calculator
Estimate body fat percentage from body measurements using a practical tape-measure method.
Why this page exists
Body fat percentage estimates can be helpful when people want more context than weight alone provides. This calculator uses a practical U.S. Navy-style measurement method so visitors can estimate body fat percentage from a few common measurements without special equipment.
Interactive tool
Run the estimate
Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.
Calculator
Body fat calculator
Estimate body fat percentage from body measurements using a practical U.S. Navy method.
Result
29.2%
Estimated body fat percentage using a U.S. Navy-style measurement formula.
Estimated body fat percentage29.2%
General categoryAverage range
Method usedU.S. Navy estimate
Height used5 ft 6 in
- The female estimate uses height, waist, neck, and hip measurements, so measurement technique matters quite a bit.
- Measure in a relaxed posture and use the same tape position each time if you are comparing changes over time.
- This is still only an estimate of body fat percentage, so pair it with other health context instead of treating it as a diagnosis.
This is an estimate, not a medical diagnosis. Measurement technique, hydration, body shape, and tool accuracy can all move the result.
Planning note
Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.
How it works
What the calculator is doing
Choose a sex and measurement system, then enter the required body measurements.
The calculator uses a standard U.S. Navy-style formula based on body circumferences and height.
It estimates body fat percentage and shows a broad category for context.
Understanding your result
Tape-measure methods are still estimates, but they can be useful for spotting broad changes over time when the measurements are taken consistently. The number becomes much less useful if the tape position changes from one check to the next.
Browse more health toolsExamples
Ways people use this tool
Example scenarios help turn a quick estimate into a more useful comparison or planning step.
Compare repeat measurements
Take measurements the same way each time to see whether the estimate trends in one direction over several weeks.
Pair with calorie and protein planning
Use the result alongside calorie and protein estimates when planning a simpler wellness routine.
FAQ
Common questions
What method does this calculator use?
It uses a U.S. Navy-style body-measurement formula based on height and body circumferences.
Why might the result change a lot between two checks?
Small measurement differences can move the estimate more than people expect, especially if the tape position or body posture changes.
Is this a diagnosis?
No. It is only an estimate meant for general planning and comparison, not a medical diagnosis or clinical assessment.
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