Use this numismatic calculation to document a collection, metal content, historical denomination, minting error, grading cost, auction price, or market scenario with explicit measurements and prices.

Sale Proceeds (currency)

Required number input.

Total Cost (currency)

Required number input.

Calculate signed sale return after using proceeds and all entered costs; not a tax calculation. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Return Percent (%)

The resulting return percent returned as a number.

• Coin value and attribution depend on authenticity, date, mint, variety, grade, surfaces, provenance, market liquidity, fees, metal assay, and current spot prices. Images and arithmetic cannot replace expert authentication or in-hand grading.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Retain weight, diameter, photographs, references, transaction fees, and price dates; verify valuable pieces with recognized catalogues and qualified independent experts.

• Bid Ask Spread Percent

  Calculate quoted bid-ask spread as a percentage of the midpoint, not the bid.

• Cleaned Coin Market Hit Percent

  Measure a cleaning-related observed price difference using otherwise comparable coins; not a universal market discount.

• Kennedy 40 Percent Silver Content

  Calculate contained silver in verified 40%-silver Kennedy half dollars; enter their measured or specified gross weight.