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Understand your estimate
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy circumference method using height, neck, waist and, for women, hip measurements. Track trends consistently.
The U.S. Navy circumference method estimates body fat from tape measurements rather than measuring fat directly. Use consistent landmarks and conditions when tracking a trend, and treat the result as a screening estimate rather than a diagnosis or exact laboratory value.
Estimate your body fat percentage using the U.S. Navy Method.
Body-composition estimateReviewed: October 2026
A tape-based estimate with measurement limits
Repeat the same landmarksSmall changes in tape placement, posture and breathing can change the result. Compare measurements taken with the same technique rather than focusing on one decimal place.
Reference: U.S. Navy circumference-method equations
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How the Body Fat Calculator Works
1
Select the applicable formula
Choose male or female because the circumference equations use different measurement combinations.
2
Measure at consistent landmarks
Enter height, neck and waist in centimetres; women also enter hip circumference. Keep the tape level and snug without compressing skin.
3
Repeat before entering
Take each circumference more than once under similar posture and breathing conditions, then resolve noticeably different readings.
4
Interpret an estimate, not a diagnosis
Use the value mainly for trends with the same method. Discuss unexpected or health-critical results with a qualified professional.
U.S. Navy circumference formulas used
Men: 86.010 × log10(waist in − neck in) − 70.041 × log10(height in) + 36.76; Women: 163.205 × log10(waist in + hip in − neck in) − 97.684 × log10(height in) − 78.387
The interface accepts centimetres and converts them to inches before applying these inch-based constants. Men enter height, neck and waist. Women also enter hip circumference. The formula estimates body fat from population-derived relationships and does not directly scan body tissue.
Example Calculation
Input: Male: height 175 cm, neck 40 cm, waist 85 cm
Output: The values are converted to inches before the Navy equation is applied; the result is an estimate and can vary with tape placement
Common Uses
- • Consistent at-home trend tracking
- • Comparing repeated circumference measurements
- • Understanding body composition beyond scale weight
- • Preparing questions for a qualified health professional
Questions about this calculator
It uses the U.S. Navy circumference equations. The interface accepts centimetres, converts them to inches, and applies sex-specific logarithmic formulas based on height and tape measurements.
Use a flexible non-stretch tape, keep it level and snug without compressing skin, and follow the calculator’s sex-specific landmarks. Measure in a relaxed posture after a normal exhale and repeat each site for consistency.
Tape position, posture, breathing, time of day and rounding can shift circumference values. Repeat the same landmarks under similar conditions and focus on a trend rather than one decimal place.
No. It is a practical circumference estimate and can differ from laboratory or imaging methods for an individual. Body shape and measurement technique affect the equation, so it should not be treated as a direct tissue measurement.
BMI uses only weight relative to height, while the Navy method uses circumference relationships to estimate fat percentage. Neither method directly diagnoses health, and each can misrepresent some body types.
No. Category bands are broad reference labels and vary by source, sex, age and population. Do not use one estimate to diagnose a condition or choose a restrictive diet; seek qualified advice for health decisions.
Use the same tape, landmarks, posture and time-of-day conditions, and compare a series of readings rather than daily fluctuations. Keep method changes separate because different tools are not directly interchangeable.
What this body-fat estimate measures
The U.S. Navy circumference method uses relationships between height and body circumferences to estimate body fat percentage. It does not scan fat tissue and cannot distinguish visceral from subcutaneous fat. The result is most useful as a repeatable estimate when the same measurement technique is used over time.
Inputs for men and women
Men enter height, neck and waist. Women enter height, neck, waist and hip. The interface accepts centimetres and converts them to inches before applying the stored inch-based constants, so values should not be manually converted before entry.
Measurement technique matters
Use a flexible non-stretch tape held level and snug without pressing into the skin. Stand relaxed, measure after a normal exhale, and repeat each site. A small change in tape position can move the final estimate.
Worked interpretation
For a man entering 175 cm height, 40 cm neck and 85 cm waist, the tool converts each value to inches and applies the male logarithmic equation. The displayed percentage and category are estimates. Repeating the measurements consistently is more informative than treating one decimal place as exact.
Body fat percentage and BMI answer different questions
BMI compares weight with height and does not distinguish fat from muscle. A circumference method uses body-shape measurements but still relies on a population equation. Neither number alone diagnoses health or replaces an individual clinical assessment.
How to use the result responsibly
Track a series collected with the same method and conditions. If a result is unexpected, recheck the tape landmarks before drawing conclusions. Consult a qualified healthcare professional when the number will influence treatment, aggressive dieting or another health decision.
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Reviewed by the DevCalc Editorial Team
This page is maintained through a documented review of formula selection, units, limitations and clear medical disclaimers. DevCalc is founded and maintained by software engineer Aditya Singh. Important financial, health, legal and government figures should still be confirmed with the relevant official source.
This calculator is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare provider for health decisions.