The Half ounce US Gold Eagle Coin Value calculator computes the value of a number of half ounce U.S. Gold Eagle coins based on their gold content, current spot price of gold and a percent numismatic adder.
INSTRUCTIONS: Enter the following:
(n) Number of 1/2 oz Gold Eagle coins
(nm) Numismatic Adder
Market Value (MV): The calculator returns the total value of the coins and bullion value in U.S. dollars. However, these can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The purity of the U.S. gold eagle coin is 0.9167. So a 1 ounce coin has 0.9167 ounces of gold. The user entered numismatic value (adder), and the current spot price of gold are used to determine the value of each coin.