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Good to Know
This is a circumference-based estimate, not a direct measurement — it can be less accurate for people with body types that fall outside the population the formula was originally validated on, including very muscular or very lean individuals. Measurement technique also affects the result meaningfully.
Disclaimer
This calculator provides estimates for informational purposes only and does not constitute financial, medical, legal, or tax advice. Always consult a qualified professional about your specific situation.
How This Calculator Works
The Army Body Fat Calculator estimates body fat percentage from simple tape-measure
circumferences, using the formula specified in AR 600-9, the U.S. Army’s body composition
standard. Enter your gender at birth, height, neck, and abdomen (or waist) measurements — plus
hip measurement if using the female formula — and this calculator estimates your body fat
percentage and which standard category it falls into.
This is a genuinely different formula from the U.S. Navy Circumference Method used by this site’s
other Body Fat Percentage Calculator — both estimate the same
thing from the same kind of tape-measure inputs, but were developed and published independently,
and don’t always agree exactly. If you have a DA Form 5500 or 5501 fitness record, this is the
formula it was calculated with.
The Formula
Men:
Body Fat %=86.010×log10(Abdomen−Neck)−70.041×log10(Height)+36.76
Women:
Body Fat %=163.205×log10(Waist+Hip−Neck)−97.684×log10(Height)−78.387
All measurements use the same unit (inches, in the formula’s original published form — this
calculator converts automatically regardless of which unit you enter in). Abdomen/waist is
measured at the navel; neck just below the larynx; hip at its widest point (women’s formula only).
The result is compared against the same American Council on Exercise (ACE) categories this site’s
Navy-method calculator already uses — Essential Fat, Athletes, Fitness, Average, and Obese — so a
given percentage lands in the same category regardless of which formula produced it.
Abdomen minus neck: 34−16=18, and log10(18)≈1.2553.
86.010×1.2553≈107.97.
log10(70)≈1.8451, and 70.041×1.8451≈129.25.
107.97−129.25+36.76≈15.5%.
An estimated body fat of about 15.5% falls in the Fitness category for men (14-17%).
Cómo funciona esta calculadora
La Calculadora de Grasa Corporal del Ejército estima el porcentaje de grasa corporal a partir de
circunferencias simples tomadas con cinta métrica, usando la fórmula especificada en el AR 600-9,
el estándar de composición corporal del Ejército de EE. UU. Ingresa tu género al nacer, estatura,
y las medidas de cuello y abdomen (o cintura) — más la medida de cadera si usas la fórmula
femenina — y esta calculadora estima tu porcentaje de grasa corporal y en qué categoría estándar
se ubica.
Esta es una fórmula genuinamente distinta del Método de Circunferencia de la Marina de EE. UU. que
usa la otra Calculadora de Porcentaje de Grasa Corporal de este
sitio — ambas estiman lo mismo a partir del mismo tipo de medidas con cinta métrica, pero fueron
desarrolladas y publicadas de forma independiente, y no siempre coinciden exactamente. Si tienes un
registro de aptitud física DA Form 5500 o 5501, esta es la fórmula con la que se calculó.
Todas las medidas usan la misma unidad (pulgadas, en la forma original publicada de la fórmula —
esta calculadora convierte automáticamente sin importar en qué unidad ingreses). El abdomen/cintura
se mide en el ombligo; el cuello justo debajo de la laringe; la cadera en su punto más ancho (solo
para la fórmula femenina).
El resultado se compara con las mismas categorías del American Council on Exercise (ACE) que ya
usa la calculadora del método de la Marina de este sitio — Grasa Esencial, Atletas, Buen Estado
Físico, Promedio y Obesidad — de modo que un porcentaje dado cae en la misma categoría sin importar
qué fórmula lo produjo.
How is this different from the U.S. Navy body fat method?
Both estimate body fat percentage from tape-measure circumferences, but they use independently-developed formulas that don't always agree exactly. This calculator uses the U.S. Army's own AR 600-9 formula — if you have a DA Form 5500/5501 fitness record, this matches the calculation it was based on.
Where exactly should I measure?
Neck: just below the larynx (Adam's apple), tape sloped slightly downward at the front. Abdomen/waist: at the navel, standing relaxed (not sucked in). Hip (women's formula only): at the widest point around the hips and buttocks. Measure snugly but without compressing the skin.
Why does the formula differ between men and women?
Fat distribution differs between men and women, so the Army method (like the Navy method) uses a different formula and includes a hip measurement for women that isn't needed for men.
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