function calculateGoldValue() {
var weight = parseFloat(document.getElementById('goldWeight').value);
var karat = parseFloat(document.getElementById('goldKarat').value);
var rate = parseFloat(document.getElementById('marketRate').value);
var wastagePercent = parseFloat(document.getElementById('wastage').value);
if (isNaN(weight) || isNaN(rate) || weight <= 0 || rate <= 0) {
alert('Please enter valid weight and current market rate.');
return;
}
if (isNaN(wastagePercent)) wastagePercent = 0;
// Step 1: Calculate Pure Gold content based on Karat (Karat / 24)
var purityFactor = karat / 24;
var pureGoldWeight = weight * purityFactor;
// Step 2: Calculate Gross Value (Pure Weight * 24K Market Rate)
var grossValue = pureGoldWeight * rate;
// Step 3: Apply Wastage/Melting Loss and Transaction Fees
var deductions = grossValue * (wastagePercent / 100);
var netValue = grossValue – deductions;
// Display Results
document.getElementById('pureWeightResult').innerText = pureGoldWeight.toFixed(3) + " g";
document.getElementById('grossValueResult').innerText = grossValue.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('deductionResult').innerText = "- " + deductions.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('netValueResult').innerText = netValue.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resultArea').style.display = 'block';
}
How to Use the Old Gold Selling Rate Calculator
When selling old jewelry, gold coins, or scrap gold, buyers do not pay the full market price listed on news tickers. Understanding how the "selling rate" is calculated helps you ensure you are getting a fair price from bullion dealers or jewelers.
1. Understanding Purity (Karat)
Gold is rarely sold in its 100% pure form (24K) because it is too soft for jewelry. Most items are 22K, 18K, or 14K. The calculator determines the actual gold content by dividing the Karat by 24. For example, 18K gold contains 75% pure gold (18/24 = 0.75).
2. Market Rate vs. Buying Rate
The "Market Rate" is the spot price for 24K (99.9%) pure gold. When you sell, the buyer uses this as a baseline but applies deductions for melting, refining, and their own profit margin.
3. Common Deductions
Wastage/Melting Loss: Jewelers often deduct 2% to 5% to account for impurities, solder, or weight lost during the melting process.
Stone Weight: Ensure you subtract the weight of any gemstones or diamonds before calculating, as gold buyers typically only pay for the metal weight.
Commission: Some dealers charge a flat percentage fee for the transaction.
Practical Example
Imagine you have a 10-gram chain made of 22K gold. The current market price for 24K gold is 60 per gram. The jeweler charges a 3% wastage fee.
Step 1: 10g x (22/24) = 9.166 grams of pure gold.
Step 2: 9.166g x 60 = 549.96 (Gross Value).
Step 3: 549.96 – 3% deduction = 533.46 Final Payout.
Disclaimer: This calculator provides an estimate based on mathematical formulas. Actual cash offers may vary based on local taxes, specific dealer margins, and professional assaying results.