Calculator Form
Use three abdomen readings for a steadier result. The form uses 3 columns on large screens, 2 on smaller screens, and 1 on mobile.
Example Data Table
| Case | Sex | Age | Height | Weight | Abdomen Readings | Avg. Abdomen | Estimated Body Fat | Army Limit |
|---|---|---|---|---|---|---|---|---|
| Example 1 | Male | 29 | 72.0 in | 190 lb | 34.0, 34.5, 34.0 in | 34.0 in | 17.89% | 24% |
| Example 2 | Female | 35 | 64.0 in | 150 lb | 31.0, 31.5, 31.0 in | 31.0 in | 27.97% | 34% |
| Example 3 | Male | 42 | 178 cm | 92 kg | 96, 95, 96 cm | 37.5 in | 24.40% | 26% |
Formula Used
Male Army one-site formula
Body Fat % = -26.97 - (0.12 × weight in pounds) + (1.99 × average abdomen in inches)
Female Army one-site formula
Body Fat % = -9.15 - (0.015 × weight in pounds) + (1.27 × average abdomen in inches)
Supporting calculations
BMI = 703 × weight in pounds ÷ height in inches²
Fat Mass = body weight × body fat percentage
Lean Mass = body weight - fat mass
The calculator rounds each abdomen reading down to the nearest 0.50 inch, then averages the three readings to the nearest 0.50 inch.
How to Use This Calculator
Frequently Asked Questions
1. What measurements do I need?
You need sex, age, height, body weight, and three abdomen readings. The calculator then rounds, averages, converts units if needed, and estimates body fat.
2. Why are three abdomen readings used?
Three readings reduce random tape error. A single pull can be loose or tight, so repeated measurements usually give a steadier working average.
3. Does height affect the Army body fat formula?
The current one-site formula uses weight and abdomen measurements. Height is still useful for BMI and recordkeeping inside this calculator.
4. Can I use centimeters and kilograms?
Yes. Choose metric units and enter your values normally. The calculator converts them into inches and pounds before applying the formula.
5. How does rounding work here?
Each abdomen reading is rounded down to the nearest 0.50 inch. The three rounded readings are averaged and rounded again to the nearest 0.50 inch.
6. Is this result official?
No. It is an informational calculator for planning and self-checks. Official determinations should follow current Army procedures and trained measurement practice.
7. What standards are used for compliance?
The calculator compares your result with the Army age-band maximum for your sex, then shows whether you are within or above that limit.
8. What do the CSV and PDF files include?
They include your main inputs, rounded measurements, estimated body fat, BMI, fat mass, lean mass, formula used, and Army standard result.
Important Note
This page is for education and quick estimation. Official assessments should follow current Army guidance, proper measurement technique, and qualified review when required.