This calculator provides a quick and accurate estimation of the total value of your gold based on its weight, current market price, and purity. Whether you are looking to sell gold, understand the value of jewelry, or simply stay informed about precious metals, this tool is designed to be straightforward and reliable.
How it Works: The Calculation
The calculator employs a simple yet effective formula to determine the total value of your gold. It takes into account three key inputs:
Weight of Gold (in grams): This is the actual mass of the gold you possess.
Current Price of Gold Per Gram: This reflects the prevailing market rate for one gram of pure (24K) gold. Market prices for gold fluctuate constantly based on global economic factors, demand, and supply. For the most accurate calculation, ensure you are using a current and reputable market price.
Purity of Gold: Gold is rarely found in its purest form (24 Karat) in jewelry or other items due to its softness. It is often alloyed with other metals to increase its durability and alter its appearance. Purity is measured in Karats, where 24 Karat (24K) is considered 99.9% pure gold. Lower Karat values indicate a lesser percentage of pure gold and a higher percentage of other metals. The calculator adjusts the value based on the stated purity.
The core calculation is as follows:
Adjusted Price Per Gram = (Current Price Per Gram / 24) * Purity (Karat Value)
And then,
Total Gold Value = Weight of Gold (grams) * Adjusted Price Per Gram
For example, if the current price of 24K gold is $70.50 per gram, and you have 50 grams of 18K gold:
The adjusted price for 18K gold would be ($70.50 / 24) * 18 = $52.875 per gram.
The total value of your 50 grams of 18K gold would be 50 grams * $52.875/gram = $2,643.75.
Note: The currency symbol ($) in the example reflects a common representation. The calculator itself does not enforce a specific currency and will display the result in the same currency unit as entered for the 'Price of Gold Per Gram'.
Use Cases for the Gold Price Calculator
Selling Gold: Get a realistic estimate of what your gold items (jewelry, coins, bars) are worth before approaching a buyer.
Jewelry Valuation: Understand the intrinsic gold value of your jewelry pieces, separate from craftsmanship or sentimental value.
Investment Tracking: Monitor the value of your gold investments based on current market prices.
Educational Purposes: Learn about gold purity and its impact on value.
Always remember that the calculator provides an estimate based on the inputs provided. Actual selling prices may vary due to market volatility, buyer's margins, assay fees, and the condition of the gold item.
function calculateGoldPrice() {
var weightInput = document.getElementById("goldWeight");
var priceInput = document.getElementById("pricePerGram");
var puritySelect = document.getElementById("purity");
var resultDisplay = document.getElementById("resultValue");
var errorDisplay = document.getElementById("errorMessage");
// Clear previous error messages
errorDisplay.textContent = "";
// Get input values
var goldWeight = parseFloat(weightInput.value);
var pricePerGram = parseFloat(priceInput.value);
var purity = parseInt(puritySelect.value);
// Input validation
if (isNaN(goldWeight) || goldWeight <= 0) {
errorDisplay.textContent = "Please enter a valid positive number for gold weight.";
resultDisplay.textContent = "–";
return;
}
if (isNaN(pricePerGram) || pricePerGram < 0) {
errorDisplay.textContent = "Please enter a valid non-negative number for the price per gram.";
resultDisplay.textContent = "–";
return;
}
if (isNaN(purity) || purity 24) {
errorDisplay.textContent = "Please select a valid gold purity.";
resultDisplay.textContent = "–";
return;
}
// Calculate adjusted price per gram based on purity
// The pricePerGram is assumed to be for 24K gold as per market convention
var adjustedPricePerGram = (pricePerGram / 24) * purity;
// Calculate total gold value
var totalValue = goldWeight * adjustedPricePerGram;
// Display the result
// We use toFixed(2) for currency-like formatting, but without a specific symbol
// as the currency is determined by the user's input for pricePerGram.
resultDisplay.textContent = totalValue.toFixed(2);
}