Old Gold Rate Calculator
function calculateOldGoldValue() {
var weight = parseFloat(document.getElementById("goldWeight").value);
var karat = parseFloat(document.getElementById("goldKarat").value);
var rate = parseFloat(document.getElementById("currentRate").value);
var wastagePercent = parseFloat(document.getElementById("wastage").value);
if (isNaN(weight) || weight <= 0) {
alert("Please enter a valid gold weight.");
return;
}
if (isNaN(rate) || rate <= 0) {
alert("Please enter the current market rate for 24K gold.");
return;
}
if (isNaN(wastagePercent) || wastagePercent < 0) {
wastagePercent = 0;
}
// 1. Calculate Pure Gold Equivalent
var purityRatio = karat / 24;
var pureWeight = weight * purityRatio;
// 2. Calculate Gross Market Value
var grossValue = pureWeight * rate;
// 3. Apply Wastage Deduction
var wastageAmount = grossValue * (wastagePercent / 100);
var netPayout = grossValue – wastageAmount;
// Display Results
document.getElementById("pureWeightResult").innerText = pureWeight.toFixed(3) + " g";
document.getElementById("grossValueResult").innerText = formatCurrency(grossValue);
document.getElementById("wastageResult").innerText = "-" + formatCurrency(wastageAmount);
document.getElementById("finalPayoutResult").innerText = formatCurrency(netPayout);
// Show the result section
document.getElementById("goldResultSection").style.display = "block";
}
function formatCurrency(num) {
return "$" + num.toLocaleString(undefined, {
minimumFractionDigits: 2,
maximumFractionDigits: 2
});
}