How Are Arm Mortgage Rates Calculated

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Body Fat Calculator (Navy Method)

Estimate your body fat percentage using standard body measurements.

Male Female
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Category

Understanding Your Body Fat Percentage

Body fat percentage is a much more accurate metric for health than BMI (Body Mass Index) because it distinguishes between muscle mass and fat mass. While BMI only looks at weight and height, a body fat calculator identifies what portion of your total weight is composed of adipose tissue.

How the Navy Method Works

The U.S. Navy Body Fat formula is a widely accepted method for estimating body composition without expensive clinical equipment like DXA scans or hydrostatic weighing. It uses specific circumference measurements to estimate the volume of the body and applies a regression formula to determine fat percentage.

  • For Men: Measurement is taken at the neck and the abdomen (at the level of the navel).
  • For Women: Measurement is taken at the neck, the waist (at the narrowest point), and the hips (at the widest point).

Health Categories Table

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%+

Realistic Example Calculation

Consider a male who is 180cm tall, with a 40cm neck and a 90cm waist. Using the Navy formula:

Formula: 495 / (1.0324 – 0.19077 * log10(waist – neck) + 0.15456 * log10(height)) – 450

His estimated body fat would be approximately 17.5%, placing him in the "Fitness" category.

function calculateBodyFat() { var gender = document.getElementById('gender').value; var height = parseFloat(document.getElementById('height').value); var neck = parseFloat(document.getElementById('neck').value); var waist = parseFloat(document.getElementById('waist').value); var hip = parseFloat(document.getElementById('hip').value); var resultBox = document.getElementById('result-box'); var bfOutput = document.getElementById('bf-output'); var bfCategory = document.getElementById('bf-category'); if (!height || !neck || !waist || (gender === 'female' && !hip)) { alert('Please fill in all required fields.'); return; } var bodyFat = 0; if (gender === 'male') { // Navy Formula for Men (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 { // Navy Formula for Women (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) { bfOutput.innerHTML = "Error"; bfCategory.innerHTML = "Please check your measurements."; } else { var finalBf = bodyFat.toFixed(1); bfOutput.innerHTML = finalBf + "%"; var category = ""; if (gender === 'male') { if (bodyFat < 6) category = "Essential Fat"; else if (bodyFat < 14) category = "Athletes"; else if (bodyFat < 18) category = "Fitness"; else if (bodyFat < 25) category = "Average"; else category = "Obese"; } else { if (bodyFat < 14) category = "Essential Fat"; else if (bodyFat < 21) category = "Athletes"; else if (bodyFat < 25) category = "Fitness"; else if (bodyFat < 32) category = "Average"; else category = "Obese"; } bfCategory.innerHTML = "Category: " + category; } resultBox.style.display = 'block'; resultBox.style.backgroundColor = '#f1fcf4'; resultBox.style.border = '1px solid #27ae60'; }

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