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Navy Method Body Fat Calculator

Accurate body composition estimation using US Navy standards

Male Female

Your Results:

Understanding Body Fat Percentage

Body fat percentage is a better indicator of health and physical fitness than BMI (Body Mass Index) because it distinguishes between lean muscle mass and fat tissue. The US Navy method used in this calculator is a widely recognized estimation formula that relies on simple circumference measurements.

How to Measure Correctly

  • Height: Measure without shoes, standing straight against a wall.
  • Neck: Measure just below the larynx (Adam's apple), sloping slightly downward toward the front.
  • Waist:
    • Men: Measure at the navel.
    • Women: Measure at the narrowest point of the natural waistline.
  • Hips (Women only): Measure at the widest horizontal point of the buttocks.

Standard Body Fat Categories

Description Women Men
Essential Fat 10-13% 2-5%
Athletes 14-20% 6-13%
Fitness 21-24% 14-17%
Average 25-31% 18-24%
Obese 32%+ 25%+

Calculation Example

If a male individual has a height of 180cm, a neck measurement of 40cm, and a waist of 90cm, the formula calculates the body fat as follows:

Formula: 495 / (1.0324 – 0.19077 * log10(waist – neck) + 0.15456 * log10(height)) – 450
Result: ~18.4% (Fitness/Average Range)

function toggleHipField() { var gender = document.getElementById('calc_gender').value; var hipContainer = document.getElementById('hip_container'); if (gender === 'female') { hipContainer.style.display = 'block'; } else { hipContainer.style.display = 'none'; } } function calculateBodyFat() { var gender = document.getElementById('calc_gender').value; var height = parseFloat(document.getElementById('calc_height').value); var neck = parseFloat(document.getElementById('calc_neck').value); var waist = parseFloat(document.getElementById('calc_waist').value); var hip = parseFloat(document.getElementById('calc_hip').value); var resultBox = document.getElementById('calc_result_box'); var outputVal = document.getElementById('calc_output_val'); var outputDesc = document.getElementById('calc_output_desc'); if (!height || !neck || !waist || (gender === 'female' && !hip)) { alert('Please enter all required measurements.'); return; } var bodyFat = 0; if (gender === 'male') { // US Navy Formula for Men (using Metric) // 495 / (1.0324 – 0.19077 * log10(waist – neck) + 0.15456 * log10(height)) – 450 bodyFat = 495 / (1.0324 – 0.19077 * (Math.log10(waist – neck)) + 0.15456 * (Math.log10(height))) – 450; } else { // US Navy Formula for Women (using Metric) // 495 / (1.29579 – 0.35004 * log10(waist + hip – neck) + 0.22100 * log10(height)) – 450 bodyFat = 495 / (1.29579 – 0.35004 * (Math.log10(waist + hip – neck)) + 0.22100 * (Math.log10(height))) – 450; } if (isNaN(bodyFat) || bodyFat < 0) { outputVal.innerHTML = "Error"; outputDesc.innerHTML = "Please check your measurements. The inputs provided resulted in an impossible calculation."; } else { outputVal.innerHTML = bodyFat.toFixed(1) + "%"; var category = ""; var color = "#333"; if (gender === 'male') { if (bodyFat < 6) { category = "Essential Fat"; color = "#3498db"; } else if (bodyFat < 14) { category = "Athlete"; color = "#27ae60"; } else if (bodyFat < 18) { category = "Fitness"; color = "#2ecc71"; } else if (bodyFat < 25) { category = "Average"; color = "#f1c40f"; } else { category = "Obese"; color = "#e74c3c"; } } else { if (bodyFat < 14) { category = "Essential Fat"; color = "#3498db"; } else if (bodyFat < 21) { category = "Athlete"; color = "#27ae60"; } else if (bodyFat < 25) { category = "Fitness"; color = "#2ecc71"; } else if (bodyFat < 32) { category = "Average"; color = "#f1c40f"; } else { category = "Obese"; color = "#e74c3c"; } } outputVal.style.color = color; outputDesc.innerHTML = "Based on your measurements, your body fat category is: " + category + "."; } resultBox.style.display = 'block'; resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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