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.army-calc-header h2 { margin: 0; font-size: 28px; text-transform: uppercase; letter-spacing: 1px; }
.army-calc-body { padding: 30px; background-color: #f9f9f9; }
.army-calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 25px; }
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.army-calc-btn:hover { background-color: #1b2e15; }
.army-result-box { margin-top: 30px; padding: 25px; background-color: #fff; border: 2px solid #2e4d23; border-radius: 6px; display: none; text-align: center; }
.army-result-value { font-size: 48px; font-weight: 800; color: #2e4d23; margin: 10px 0; }
.army-result-label { font-size: 18px; font-weight: 600; color: #555; }
.army-article { padding: 30px; background: white; border-top: 1px solid #eee; }
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.army-article ul { padding-left: 20px; }
.army-article table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.army-article th, .army-article td { border: 1px solid #ddd; padding: 12px; text-align: center; }
.army-article th { background-color: #2e4d23; color: white; }
@media (max-width: 600px) { .army-calc-grid { grid-template-columns: 1fr; } }
Gender
Male
Female
Height (Inches)
Neck Circumference (Inches)
Waist Circumference (Inches)
Hip Circumference (Inches)
Calculate Body Fat %
Estimated Body Fat Percentage:
0%
How the Army Body Fat Calculator Works
The U.S. Army uses the "Tape Test" to determine if service members meet the body composition standards outlined in Army Regulation 600-9 (The Army Body Composition Program) . Unlike standard BMI, which only considers height and weight, the tape test estimates body fat percentage based on specific anatomical measurements.
Required Measurements
To ensure accuracy, measurements should be taken to the nearest 1/4 inch:
Height: Measured without shoes, standing flat against a wall.Neck: Measured just below the larynx (Adam's apple), with the tape slanting slightly downward to the front.Waist (Men): Measured at the navel (belly button) while standing relaxed.Waist (Women): Measured at the narrowest point of the abdomen.Hips (Women only): Measured at the widest point of the buttocks.
Official Army Body Fat Formulas
The calculator uses the official mathematical equations established by the Department of Defense:
Males: % Body Fat = 86.010 × log10(Waist – Neck) – 70.041 × log10(Height) + 36.76Females: % Body Fat = 161.278 × log10(Waist + Hip – Neck) – 138.240 × log10(Height) + 9.742
Maximum Allowable Body Fat Standards
Age Group
Male Limit
Female Limit
17–20
20%
30%
21–27
22%
32%
28–39
24%
34%
40+
26%
36%
Example Calculation
Consider a 25-year-old male Soldier who is 70 inches tall, with a 16-inch neck and a 36-inch waist:
Waist (36) – Neck (16) = 20
Formula: 86.010 × log10(20) – 70.041 × log10(70) + 36.76
Result: ~21.7% (Rounded down to 21% per Army regulations)
Status: Pass (Under the 22% limit for his age group)
function toggleHipField() {
var gender = document.getElementById('armyGender').value;
var hipContainer = document.getElementById('hipContainer');
if (gender === 'female') {
hipContainer.style.display = 'flex';
} else {
hipContainer.style.display = 'none';
}
}
function calculateArmyFat() {
var gender = document.getElementById('armyGender').value;
var height = parseFloat(document.getElementById('armyHeight').value);
var neck = parseFloat(document.getElementById('armyNeck').value);
var waist = parseFloat(document.getElementById('armyWaist').value);
var resultBox = document.getElementById('armyResultBox');
var resultValue = document.getElementById('armyResultValue');
var statusText = document.getElementById('armyStatus');
if (!height || !neck || !waist) {
alert('Please enter all required measurements.');
return;
}
var bodyFat = 0;
if (gender === 'male') {
// Army Male Formula: 86.010*LOG10(waist-neck) – 70.041*LOG10(height) + 36.76
var diff = waist – neck;
if (diff <= 0) {
alert('Waist must be larger than neck.');
return;
}
bodyFat = 86.010 * (Math.log(diff) / Math.LN10) – 70.041 * (Math.log(height) / Math.LN10) + 36.76;
} else {
var hips = parseFloat(document.getElementById('armyHips').value);
if (!hips) {
alert('Please enter hip measurement.');
return;
}
// Army Female Formula: 161.278*LOG10(waist+hip-neck) – 138.240*LOG10(height) + 9.742
var combined = waist + hips – neck;
if (combined <= 0) {
alert('Calculation error: Ensure measurements are correct.');
return;
}
bodyFat = 161.278 * (Math.log(combined) / Math.LN10) – 138.240 * (Math.log(height) / Math.LN10) + 9.742;
}
// Army regulation rounds down to the nearest whole percent
var finalResult = Math.floor(bodyFat);
if (isNaN(finalResult) || finalResult < 0) {
resultValue.innerHTML = "Error";
statusText.innerHTML = "Please check your input values.";
} else {
resultValue.innerHTML = finalResult + "%";
statusText.innerHTML = "Calculated using AR 600-9 tape test standards.";
}
resultBox.style.display = 'block';
}