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Space 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 Space Force rounding, aggregation, and ratio-reporting rules.

Other services and standards

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Measurements

Sex

Used to show the body-fat limit for follow-up.

Measurement unit

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

Height (inches)

Enter height to the nearest 0.50 inch.

Waist measurements (inches)

First

Second

Third

Using a spring-loaded tape at about four ounces of tension, take three waist measurements at the umbilicus with the tape horizontal and record each at the end of a normal exhale.

Average waist: --

Measurement details

Using a spring-loaded tape at about four ounces of tension, take three waist measurements at the umbilicus with the tape horizontal and record each at the end of a normal exhale.

Average the three closest measurements, round down to the nearest 0.50 inch, divide by height in like units, and truncate the WHtR to two decimal places.

Result

Ready

WHtR --

Service limit --

Waist limit --

Within Standard (<= 0.54) Follow-up (>= 0.55)

Result guidance and next steps

Recorded 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

SPFMAN 36-2905Official Space Force WHtR measurement, calculation, and body composition procedures Public DoW military fitness guidanceDepartment-wide military fitness guidance

Space Force Measurement Guide

How to perform Space Force WHtR measurements correctly

This 57-second vertical video covers the official measurement team, spring-loaded tape, waist placement at the belly button, posture, three readings, averaging, truncation, and the Space Force standard.

Procedure based on SPFMAN 36-2905, the official Space Force fitness and body composition manual.

Read video transcript

Use a spring-loaded tape at about four ounces of tension. Place it horizontally at the umbilicus and read after a normal exhale. Use the three closest measurements, average them, and round down to the nearest half inch. Divide waist by height using the same units, then truncate to two decimals. The Space Force standard is less than 0.55.

Download vertical video View official Space Force manual

Space Force standard explained

How to calculate Space Force WHtR

Record height in inches to the nearest half inch, or enter the centimeter equivalent for automatic conversion.
Using a spring-loaded tape at about four ounces of tension, take three waist measurements at the umbilicus with the tape horizontal and record each at the end of a normal exhale.
Average the three closest measurements, round down to the nearest 0.50 inch, divide by height in like units, and truncate the WHtR to two decimal places.
Compare the reported ratio with less than 0.55.

What happens next?

Use DAF Form 108 and current Space Force guidance for official recording, disputes, and follow-up. Guardians with WHtR of 0.55 or greater receive a further body-fat evaluation under SPFMAN 36-2905.

Public source reviewed: SPFMAN 36-2905, Body Composition Assessment, September 26, 2025. SPFMAN 36-2905, Body Composition Assessment, September 26, 2025. · DAF Form 108, Department of the Air Force Fitness Education and Intervention Processing

Compare every service's measurement and threshold rules

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