Army Body Fat Calculator

The Army measures one place now: the waist at the navel

For decades the Army taped the neck and waist for men and the neck, waist and hip for women. Army Directive 2023-11, issued on 9 June 2023, replaced that with a single measurement of the abdomen at the navel for both sexes. The one-site test was phased in over 12 months, and since 8 June 2024 it has been the only authorized circumference method, as the Army Inspector General's 2023 update spells out. The current implementing guidance, attached to ALARACT 032/2025 from March 2025, keeps the same two authorized tools: the one-site tape test and a supplemental machine assessment such as DXA, InBody 770 or Bod Pod.

This matters for anyone comparing calculators. Pages built on the old formula ask for a neck measurement and often a hip measurement, and they will return a different number from the one a unit commander records. The equation below is the one printed in the guidance that replaced the multi-site method.

The equation the Army uses for the tape test

Both equations take body weight in pounds and abdominal circumference in inches. Nothing else goes in: no height, no neck, no age.

• Men: percent body fat = -26.97 - (0.12 x body weight in pounds) + (1.99 x abdomen in inches)
• Women: percent body fat = -9.15 - (0.015 x body weight in pounds) + (1.27 x abdomen in inches)

The two constants at the end, -26.97 and -9.15, set the baseline, and the two coefficients tell you what each measurement is worth. For a man, every inch of waist adds 1.99 points and every 10 pounds of body weight removes 1.2 points. For a woman, an inch of waist adds 1.27 points and 10 pounds removes 0.15 points. Age and sex never enter the arithmetic; they only pick which standard the result gets compared with.

That negative weight term surprises people, so read it carefully. The equation was fitted to soldiers whose waist and weight rise together, and it uses weight to separate a lean 220 pound soldier from a softer 220 pound soldier at the same waist. Held at a fixed waist, adding 10 pounds lowers the score by 1.2 points for a man. Cutting weight without losing inches will move the number the wrong way, which is why the tape is the measure that counts.

Two official sample calculations, worked line by line

The guidance publishes sample calculations to show how the rounding works. Use them to check any calculator, including this one.

Male, 210 pounds, 35 inch abdomen. First the weight term: 0.12 x 210 = 25.2. Then the waist term: 1.99 x 35 = 69.65. Then the whole line: -26.97 - 25.2 + 69.65 = 17.48 percent, which the Army records as 17 percent.

Female, 165 pounds, 30 inch abdomen. Weight term: 0.015 x 165 = 2.475. Waist term: 1.27 x 30 = 38.1. The full line: -9.15 - 2.475 + 38.1 = 26.475 percent, recorded as 26 percent. Notice that the official examples keep three decimals through the arithmetic and round only the final percentage, to the nearest whole percent.

The standards your number is compared with

Table B-2 of the body composition guidance sets the maximum allowable percentage by age and sex. Nothing in the 2023 change moved these numbers, so a 22 percent standard for a man in his twenties was the standard before the one-site tape and still is.

A soldier above the maximum is enrolled in the Army Body Composition Program, with counseling, a soldier action plan and monthly reassessment. The program's own rule for satisfactory progress is a monthly loss of 3 to 8 pounds or 1 percent body fat.

Most soldiers never see the tape

Height and weight screening comes first. If a soldier's weight is at or under the screening weight for their height and age in Table B-1, no body fat assessment happens at all. A 28 to 39 year old man at 5 feet 9 inches screens at 184 pounds, and a woman of the same age at 5 feet 6 inches screens at 158 pounds.

There is also a fitness exemption. An Army University Press review published in 2026 reports that Army Directive 2025-17, issued in September 2025, exempts soldiers who score 465 or higher on the Army Fitness Test with at least 80 points in each of the five events. The exemption lasts until the next fitness assessment, which must come within eight months for it to stay valid.

Borderline cases: who misses by a point

Most real questions come from soldiers sitting within two points of the line, so work those out rather than trusting a round number.

A 38 year old man at 200 pounds with a 38 inch waist: -26.97 - 24 + 75.62 = 24.65 percent, which records as 25 and misses his 24 percent standard by one point. To pass at that weight he needs a 37.5 inch waist, since (24 + 26.97 + 24) / 1.99 = 37.67 and the tape is read down to the nearest half inch.

A 34 year old woman at 150 pounds with a 34 inch waist: -9.15 - 2.25 + 43.18 = 31.78 percent, comfortably under the 34 percent standard. Take her to a 37 inch waist at the same weight and the line becomes -9.15 - 2.25 + 46.99 = 35.59 percent, 1.59 points over, and she would need 35.75 inches to clear it.

One point of body fat on this equation is a little over half an inch of waist for a man and just under an inch for a woman. That is the practical size of a recheck.

How the tape is placed, and why placement decides the result

Half an inch of tape position can move a man a full point, so the procedure is part of the measurement, not paperwork around it.

• Measure against bare skin at the navel, tape parallel to the floor, arms at the sides, at the end of a normal relaxed exhale.
• Round each reading down to the nearest half inch. 34 3/4 inches is recorded as 34 1/2.
• Take three abdominal measurements. Readings should sit within an inch of each other; average the three closest and record to the nearest half inch. If one reading is more than an inch off, take a fourth.
• Use a fiberglass tape one quarter to one half inch wide. Cloth tapes stretch and steel tapes do not follow the body.
• No binding undergarments, and no shoes. Weight is recorded to the nearest pound with no deduction for clothing.

A soldier who fails is retaped by a different team before any action is taken, and after failing the first test and the confirmation test may request one supplemental assessment by DXA, InBody 770 or Bod Pod, taken no earlier than 24 hours after the failed tape test.

What this estimate does not tell you

This is a regression estimate built for a specific purpose: deciding whether a soldier meets the Army standard. It is not a body composition measurement and it is not medical advice. A DXA scan of the same soldier can land several points away in either direction, which is exactly why the supplemental assessment exists.

It also does not agree with the U.S. Navy circumference formula used by most civilian calculators, because the two were fitted on different populations with different inputs. Comparing a Navy number with an Army number tells you nothing useful; comparing your own number across months with the same method tells you plenty. For the Navy method, the body fat calculator for women walks through the neck, waist and hip tape, and the BMI calculator covers the height and weight screen that decides whether a tape test happens at all. The CDC's adult BMI calculator is a reasonable cross check for the general population, though BMI cannot separate muscle from fat and the Army stopped using it as the pass or fail measure.

Full text of the regulation is in AR 600-9, The Army Body Composition Program. Read the appendix before you argue with a tape.