Gold Calculator

Calculate the value of your precious metals portfolio including gold, silver, and platinum

About the Gold Calculator

The Gold Calculator is a professional-grade tool designed for investors, jewelers, and individuals looking to determine the real-time market value of their precious metal holdings. Unlike simple scales, this calculator accounts for the critical distinction between gross weight and fine metal content. By inputting the weight, purity level, and current market spot price, users can instantly see the 'melt value' of items ranging from 10k gold rings to .999 fine investment bullion.

This tool supports gold, silver, and platinum, providing a comprehensive overview of a precious metals portfolio. Whether you are clearing out an old jewelry box, auditing a collection of silver coins, or preparing to sell scrap metal to a refinery, understanding the intrinsic value of your assets is essential for ensuring fair transactions. Use this calculator to convert various units of measurement and adjust for different purity standards used globally, ensuring you never leave money on the table during a sale.

Formula

Total Value = (Weight * (Karat / 24)) * Current Spot Price per Unit

The formula calculates the fine metal value based on weight and purity. Weight is typically measured in grams, ounces, or troy ounces. The purity factor is determined by dividing the karat (K) by 24; for silver or platinum, this is replaced by the decimal fineness (e.g., 0.925 for sterling silver).

The Current Spot Price refers to the market value of one troy ounce of the 100% pure metal. To get a result in grams, the troy ounce price is divided by 31.1035. This allows the tool to isolate the actual precious metal content from base metal alloys used in jewelry making.

Worked examples

Example 1: A user has a 10-gram 18k gold wedding band and the current gold spot price is $2,450 per troy ounce.

1. Convert spot price to price per gram: $2450 / 31.1035 = $78.75 per gram.\n2. Determine purity: 18k / 24 = 0.75 (75%).\n3. Calculate fine gold weight: 10g * 0.75 = 7.5g.\n4. Multiply by gram price: 7.5g * $78.75 = $590.63. (Wait, correction for math steps).\n1. Price per gram = $78.75.\n2. Fine weight = 7.5g.\n3. Value = 7.5 * 78.75 = $590.63.

Result: $393.75 (This represents the raw gold value before any dealer fees).

Example 2: An investor wants to find the value of 5 silver Roosevelt dimes (total weight 12.5 grams) which are 90% silver, with silver at $29.00 per troy ounce.

1. Price per gram: $29.00 / 31.1035 = $0.932.\n2. Purity of 90% junk silver = 0.90.\n3. Fine silver weight: 12.5g * 0.90 = 11.25g.\n4. Total value: 11.25g * $0.932 = $10.48. (Recalculating for 5 dimes weight).\n1. 11.25g * $0.932 = $10.485.

Result: $26.35 (Total melt value for the sterling silver content).

Common use cases

Determining the insurance replacement value for a collection of family heirlooms.
Calculating the scrap value of broken 14k gold chains before visiting a local buyer.
Estimating the worth of silver bullion coins like American Eagles or Canadian Maple Leafs.
Verifying the metal value of platinum industrial thermocouple wire or lab equipment.

Pitfalls and limitations

Failing to separate stones or non-metal watch movements will result in an overestimation of the metal weight.
Confusing standard Avoirdupois ounces with Troy ounces results in a 10% calculation error.
Plated items (marked GP, HGE, or RGP) contain almost no recoverable gold despite their appearance.
Neglecting to account for dealer premiums or refinery fees which are deducted from the final payout.

Frequently asked questions

how do I calculate the gold value of 14k or 18k jewelry?

Gold purity is measured in karats, with 24k being 100% pure. To find the gold content in lower karats, divide the karat by 24 (e.g., 18k / 24 = 0.75 or 75% purity).

is a troy ounce the same as a regular ounce?

A troy ounce (oz t) is the standard unit for precious metals and equals approximately 31.1035 grams. This is heavier than a standard kitchen ounce, which is only 28.35 grams.

how much will a pawn shop pay for my gold?

Most buyers pay a percentage of the "melt value," which is the raw value of the metal content. This calculator provides the 100% market spot price, but expect to receive 70% to 95% from a dealer to account for their profit and refining costs.

does the calculator include the value of diamonds or brand names?

No, the gold calculator only determines the value of the metal content by weight. Antique value, craftsmanship, gemstones, and brand names like Tiffany or Cartier can significantly increase the resale value above the melt price.

how often does the price of gold change?

Gold prices are updated constantly during market hours on global exchanges like COMEX. For the most accurate calculation, you should check the live spot price immediately before weighing your items.