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Army Body Fat Calculator

Check the US Army's current waist-to-height ratio standard (below 0.55) and see the former one-site tape-test body fat estimate it replaced.

Level: Grades 6–7

Printable worksheet

Army Body Fat Calculator

Know the answer you need? Pick an input to work backward.

Inputs
Sex

Used only for the former tape-test estimate; the current ratio standard is the same for everyone.

Units

In inches for US units, centimeters for metric.

Measured horizontally around the abdomen at the level of the navel, in the same units as height.

In pounds or kilograms. Used only for the former tape-test estimate.

Result

Waist-to-height ratio

0.514

Waist-to-height ratio 0.514: below the Army's 0.55 limit. The former one-site tape equation would have given about 23% body fat.

Current Army standard (WHtR below 0.55)
Within the standardOfficial measurements are taken by trained personnel, and a reading of 0.55 or more is confirmed by a second team the same day.
Waist limit for this height (must be less than)
38.5 in
Former tape-test body fat estimate (AD 2023-11, rescinded)
23 %No longer used for Army standards; shown for reference only.

See the step-by-step solution ↓

Step-by-step solution

  1. Divide the waist measurement at the navel by height (both in the same units)

    WHtR=36 in70 in=0.514286

  2. The ratio is below 0.55, so it is within the current Army standard

    0.514 < 0.55

  3. For this height, the waist must be less than 0.55 × height

    0.55×70 in=38.5 in

  4. Former one-site tape equation for men (AD 2023-11, now rescinded)

    body fat %=−26.97−0.12×180+1.99×36=23.07%

  5. That directive rounded the result to the nearest whole percent

    23.07% ≈ 23%

Test yourself

20 quick questions built from this calculator's formula: work out results, predict what happens when an input changes, and work backward from an answer. Every answer comes with the working.

Please note: This calculator gives a general screening estimate, not a diagnosis. Talk to a qualified healthcare professional about your individual health.

What this calculator does

Check whether your waist and height meet the US Army's current body standard. The Army Body Composition Program changed in July 2026. Army Directive 2026-13 made the waist-to-height ratio the only measurement used. Your waist is measured around the navel and divided by your height. A ratio below 0.55 meets the standard. This replaced the height and weight screening tables and the tape test of body circumferences. No fitness test score exempts a Soldier from it.

This calculator works out your ratio from your height and waist and tells you whether it's below 0.55. It also gives the largest waist that stays under the limit for your height. Many people still search for the older tape test, so it shows that estimate too. That's the one-site belly equation from Army Directive 2023-11, which the 2026 directive cancelled. It's clearly marked as no longer in use. All of this is for information only. Trained personnel take the official measurements. A reading of 0.55 or more is confirmed by a second team the same day before any action is taken.

Where it's used

Why this math matters outside the classroom:

  • Readiness checks. A Soldier 68 inches tall works out that the waist must stay under 0.55 × 68 = 37.4 inches.
  • Recruiting preparation. Applicants measure a 34-inch waist at 70 inches tall and get a ratio of 0.486, below the 0.55 limit.
  • Unit fitness planning. Leaders track ratios over several months to see which Soldiers are approaching 0.55 and plan training early.
  • Comparing records. Personnel compare an old tape-test result of 23% with a new ratio of 0.514 when reviewing past assessments.
  • Ratios in class. Students see that a ratio has no units: 91.44 cm ÷ 177.8 cm and 36 in ÷ 70 in both give 0.514.

How to use it

  1. Choose inches and pounds or centimeters and kilograms.
  2. Enter your height and your waist measured around the abdomen at the level of the navel, in the same units.
  3. If you also want the former tape-test estimate, enter your sex and weight. They don't affect the ratio.
  4. Read your waist-to-height ratio, whether it's within the standard, and the waist limit for your height.

What the inputs mean

Sex
The current ratio standard is the same for men and women. The former tape equation used different numbers for each.
Height
Your standing height without shoes. Use the same unit as the waist.
Waist at the navel
Measure straight around your belly, level with the navel. Trained teams take the Army's measurements, so a tape measure at home gives only an estimate.
Body weight
Only used for the former one-site tape-test equation, which needed body weight in pounds.

Formula and method

WHtR = waist at navel ÷ height   (same units)
Meets the standard when WHtR < 0.55
Waist limit = 0.55 × height   (the waist must be below this)
Former tape test, men (AD 2023-11):   % body fat = −26.97 − 0.12 × weight (lb) + 1.99 × abdomen (in)
Former tape test, women (AD 2023-11): % body fat = −9.15 − 0.015 × weight (lb) + 1.27 × abdomen (in)

WHtR stands for waist-to-height ratio: your waist divided by your height. Because both are in the same units, the ratio has no units. So it gives the same answer in inches or centimeters. The 0.55 line comes from Army Directive 2026-13. A ratio below 0.55 meets the standard. A ratio of 0.55 or more, once a second measurement confirms it, leads to enrollment in the Army Body Composition Program. Multiplying 0.55 by your height gives the waist size that would just reach the limit.

The former one-site equations used only body weight and the measurement around the belly (abdomen). The result was rounded to the nearest whole percent. For example, an Army sample for a woman weighing 165 lb with a 30-inch abdomen gives 26.475%, recorded as 26%. Under that directive, the result was compared with body fat maximums based on age and sex. Those maximums no longer apply, so they aren't shown here.

For the former equation, metric inputs are converted exactly: 1 inch is 2.54 cm and 1 pound is 0.45359237 kg.

Worked example

A Soldier is 70 inches tall with a 36-inch waist at the navel and weighs 180 lb.

  1. WHtR = 36 ÷ 70 = 0.514.
  2. 0.514 is below 0.55, so it is within the current standard.
  3. Waist limit for 70 inches: 0.55 × 70 = 38.5 inches, so the waist must stay under 38.5 inches.
  4. For reference, the former men's tape equation gives −26.97 − 0.12 × 180 + 1.99 × 36 = 23.07%, recorded as 23%.

Result: A waist-to-height ratio of 0.514, within the Army's 0.55 standard, with a waist limit of 38.5 inches for this height.

Understanding the result

Below 0.55 meets the current Army standard. The closer you are to 0.55, the less room there is for small measuring differences. At 70 inches tall, half an inch of waist changes the ratio by about 0.007.

A home result doesn't replace an official measurement. If a Soldier's first measurement is 0.55 or more, a different team measures again on the same duty day. Only then can the commander take any action.

The former tape-test number is an estimate from a statistical (regression) equation, not a direct measurement of body fat. It's shown only so you can compare it with older records.

Assumptions and limitations

  • Waist and height are measured in the same units, with the waist taken at the navel.
  • The standard is AD 2026-13 as published in July 2026. Later guidance in AR 600-9, the Army regulation that puts it into practice, may change procedures.
  • This doesn't replace an official Army measurement or any decision made under the Army Body Composition Program.
  • The directive doesn't say how the ratio is rounded. So the ratio here isn't rounded before it's compared with 0.55.
  • The ratio and the tape equation are screening tools. Neither one measures body fat directly, and neither is a health diagnosis.

Frequently asked questions

Does the Army still use the tape test?

No. Army Directive 2026-13 made the waist-to-height ratio the only approved measure. It cancelled (rescinded) the one-site tape test directive, AD 2023-11. It also says no tape test or other body fat check can be used to challenge a ratio result.

What waist size do I need to stay under?

Multiply your height by 0.55. At 66 inches the waist must be under 36.3 inches; at 70 inches, under 38.5 inches; at 74 inches, under 40.7 inches. The calculator shows this limit for your height.

Is the standard different for men and women or by age?

No. The 0.55 ratio applies to all Soldiers. The former body fat standards varied by age and sex, but they were replaced along with the tape test.

Can a high fitness test score exempt me?

Not under the 2026 directive. It states that no Army Fitness Test score exempts a Soldier from the waist-to-height standard, and it rescinded the earlier exemption directives.

How is the waist measured?

Around the belly, level with the navel. Trained personnel take official measurements. At home, keep the tape level and snug without pressing into the skin. Measure at the end of a normal breath out.

Sources

How this calculator is checked

Method: Army Directive 2026-13 (waist-to-height ratio, standard below 0.55, waist at the navel); former one-site equations from Army Directive 2023-11 as given in Army IG sample calculations (men −26.97 − 0.12W + 1.99A; women −9.15 − 0.015W + 1.27A; nearest whole percent). The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.

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