Copper

Copper is a precious metal that is used in Faerûn as the baseline of most currency. When used as currency, it is usually cast into copper pieces (cp) of a standard weight.

Worth
Most coins in Faerûn work off of the silver and gold standard, with copper pieces (cp) being worth 1/100th of a gold piece (gp) and Silver pieces (sp) being worth 1/10 of a GP. Electrum coins are worth 50 cp (1/2 gp), and platinum coins are worth 500cp (5gp) in 1st and 2nd edition and 1,000cp (10gp) in 3rd and 4th edition.

Conversion
Simplified: 1000cp = 100sp = 20ep = 10gp = 1pp