A gold coin’s total weight is not always its pure gold weight. The melt calculation must use fine gold content.
Gold content is a weight, not just a karat number
A 22-karat gold coin is made from a gold alloy, not pure gold by total weight. The one-ounce American Gold Eagle, for example, contains a full fine troy ounce of gold and weighs more than one troy ounce overall because of its other alloy metals.
Historical U.S. gold denominations
A standard $20 Double Eagle contains about 0.9675 fine troy ounces of gold. A standard later $10 Eagle contains about 0.48375 fine troy ounces. Earlier historic issues can follow different specifications, so verify the exact series.
A sample calculation
For a standard $20 Double Eagle at an illustrative gold spot price of $4,000 per troy ounce, 0.9675 × $4,000 = $3,870 as metal content value. This is not a quote, a collector valuation or a current market price.
Historic gold has a big collector exception
Some pre-1933 gold coins trade mainly on rarity and condition. Before selling, record the date, mint mark and design, and compare numismatic auction results or seek specialist verification.
Beware of gold plating
A gold-colored or plated coin is not equivalent to a solid gold coin. Authenticity, dimensions and assay are important for suspect pieces. This calculator does not authenticate your coin.
Put the formula to work
Open our multi-coin calculator to enter coin quantities and your own silver or gold spot quotation. For mixed lots, save a private collection and print a metal-content worksheet.
See the source and calculation methodology for published nominal fine-metal weights and additional research references.