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Body Fat Percentage Calculator (Navy Method)

The Navy method is a common way to estimate body fat percentage using circumference measurements. It's a simple method that can be done at home.

Male Female
.calculator-container { font-family: Arial, sans-serif; max-width: 600px; margin: 20px auto; border: 1px solid #ccc; border-radius: 8px; padding: 20px; box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); } .calculator-form h2 { text-align: center; margin-bottom: 15px; color: #333; } .calculator-form p { text-align: center; margin-bottom: 20px; color: #555; font-size: 0.9em; } .form-group { margin-bottom: 15px; } .form-group label { display: block; margin-bottom: 5px; font-weight: bold; color: #444; } .form-group input[type="number"], .form-group select { width: calc(100% – 10px); padding: 8px; border: 1px solid #ccc; border-radius: 4px; font-size: 1em; } .form-group select { appearance: none; /* Remove default arrow */ background-image: url('data:image/svg+xml;charset=US-ASCII,'); background-repeat: no-repeat; background-position: right 8px top 50%; background-size: 12px 7px; } button { width: 100%; padding: 10px; background-color: #4CAF50; color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 1.1em; transition: background-color 0.3s ease; } button:hover { background-color: #45a049; } .calculator-result { margin-top: 20px; padding: 15px; background-color: #f9f9f9; border: 1px solid #eee; border-radius: 4px; text-align: center; font-size: 1.1em; color: #333; } function calculateBodyFat() { var neck = parseFloat(document.getElementById("neckCircumference").value); var waist = parseFloat(document.getElementById("waistCircumference").value); var hip = parseFloat(document.getElementById("hipCircumference").value); var height = parseFloat(document.getElementById("height").value); var gender = document.getElementById("gender").value; var resultDiv = document.getElementById("result"); resultDiv.innerHTML = ""; // Clear previous results if (isNaN(neck) || isNaN(waist) || isNaN(hip) || isNaN(height)) { resultDiv.innerHTML = "Please enter valid numbers for all fields."; return; } var bodyFatPercentage = 0; if (gender === "male") { // Navy method formula for men if (hip > 0) { // Hip circumference is used for men bodyFatPercentage = 495 / (1.0324 – (0.19077 * Math.log10(waist – neck)) + (0.15457 * Math.log10(height))) – 450; } else { resultDiv.innerHTML = "Please enter a valid hip circumference for males."; return; } } else if (gender === "female") { // Navy method formula for women bodyFatPercentage = 495 / (1.29579 – (0.35004 * Math.log10(waist + hip – neck)) + (0.22100 * Math.log10(height))) – 450; } else { resultDiv.innerHTML = "Please select a gender."; return; } // Basic validation for realistic results if (bodyFatPercentage 60) { resultDiv.innerHTML = "Calculated body fat percentage is outside typical realistic ranges. Please double-check your measurements."; } else { resultDiv.innerHTML = "Your estimated Body Fat Percentage: " + bodyFatPercentage.toFixed(2) + "%"; } }

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