Air Force WHtR Calculator

Waist-to-height ratio · Not an official assessment

Enter height and the 3 required waist readings in inches or centimeters. The calculator applies the Air Force rounding, aggregation, and ratio-reporting rules.

Other services and standards
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Measurements

Ratio only, not a PFRA score or pass/fail.

Official calculations use inches and the selected service's rounding rules.

Enter height to the nearest 0.50 inch.

Measure the waist three times at the midpoint between the lowest rib and top of the hip bone, after a normal exhale. Round each down to half an inch. Take an additional reading if the measurements differ by more than one inch.

Average waist: --
Measurement details

Measure the waist three times at the midpoint between the lowest rib and top of the hip bone, after a normal exhale. Round each down to half an inch. Take an additional reading if the measurements differ by more than one inch.

Average the three closest readings, round the average down to half an inch, divide by height, and truncate the ratio to two decimal places. This calculator does not determine a PFRA score or pass/fail.

Result

Ready

WHtR --
Reference 0.55
Below 0.55 reference At or above reference
Result guidance and next steps

Average Waist --
Height --
Forms and sources

Body Composition Forms

DAF Form 108, Department of the Air Force Fitness Education and Intervention ProcessingDepartment of the Air Force form used for fitness education and intervention processing by the U.S. Air Force and U.S. Space Force, including body composition program actions.

References

U.S. Air Force WHtR guidanceCurrent public measurement landmark and standardPublic DoW military fitness guidanceDepartment-wide military fitness guidance

Use current service procedures for an official assessment. This tool does not replace a trained evaluator.

Air Force standard explained

How to calculate Air Force WHtR

  1. Record height in inches to the nearest half inch, or enter the centimeter equivalent for automatic conversion.
  2. Measure the waist three times at the midpoint between the lowest rib and top of the hip bone, after a normal exhale. Round each down to half an inch. Take an additional reading if the measurements differ by more than one inch.
  3. Average the three closest readings, round the average down to half an inch, divide by height, and truncate the ratio to two decimal places. This calculator does not determine a PFRA score or pass/fail.
  4. Compare the reported ratio with 0.55 reference, not PFRA pass/fail.

What happens next?

Follow current Air Force and unit guidance for repeat readings, official recording, and any required follow-up. AFMAN 36-2905 paragraph 3.15.4.7 requires secondary body-fat assessment when WHtR exceeds 0.55 and PFRA standards are not met. A ratio alone does not determine that outcome.

Public source reviewed: AFMAN 36-2905, March 24, 2026, paragraphs 3.15.4.2, 3.15.4.5, and 3.15.4.7. AFMAN 36-2905, March 24, 2026, paragraphs 3.15.4.2, 3.15.4.5, and 3.15.4.7.

Compare every service's measurement and threshold rules

Reviewed September 4, 2026 by the HeightWaist.com maintainer.

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