Basic Currency values

Coins in the lands of Faerin come in a number of sizes and denominations. What helps, however, is to understand the value of the metal that makes up the coins, and the standard sizes coins are minted in. Your "normal" coin of the realm is based on a weight of 70 grains, or 4.5359 ounces. This puts 100 coins to a pound for the weight of currency.
Copper is the coin of the people, and most transactions will be done in copper coins. Copper is valued at a twelveth of Silver. So 12 Copper coins of normal weight are worth 1 Silver coin of normal weight. Silver is valued at a twentieth of Gold, so 20 Silver is worth a single Gold coin. It would take 240 Copper coins to equal a single normal weight Gold coin. These weights are the bases of all trade in Faerin.

Standard Exchange Rates - Common & Uncommon Metals

Coin Exchange Rates for normal sized 4.5359g coins of pure metal.

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Coin	tp	bp	cp	sp	ep	gp
Tin (tp)	1	1/10	1/100	1/1200	1/12000	1/24000
Bronze (bp)	10	1	1/10	1/120	1/1200	1/2400
Copper (cp)	64	8	1	1/12	1/120	1/240
Silver (sp)	768	96	12	1	1/10	1/20
Electrum (ep)	7680	960	120	10	1	1/2
Gold (gp)	15360	1920	240	20	2	1

Tin, Bronze, and Copper are the most common coin types used in Human exchange. These three metals are by far the most prevalent of the coins you will find, and they come in a lot of shapes and sizes. Often times merchants will cut a coin in half, quarters, or even parts of eight; to make the change for a transaction. If the people of an area use these partial pieces a lot, they get minted as whole coins worth the value of a half coins, our even double coins.
Silver, Electrum, and Gold are worth more, but uncommon in distribution and used in bigger transactions. These coins are more commonly used by wealthy merchants and nobles.
It is, however, the metal in the coin and not the coin itself that generates trade and commerce. Many merchants will weight the coins to ensure they are the correct weight for the value. Countries who have shaved off value or do not use pure metals will often time find their currency of little use outside their towns.

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Note: Dwarven merchants are very picky about the quality of metals. It is advised to not buy while using mixed metals like Bronze or Electrum as they will often devalue it without the ability to know the correct composition of said metal. They will also rarely except Tin coins used by the human nations.

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The extended metal exchange rates are as follows:

• Tin is traded 10 to 1 with Bronze
• Bronze is traded 10 to 1 with Copper
• Copper is traded 12 to 1 with Silver
• Silver is traded 10 to 1 with Electrum
• Silver is traded 20 to 1 with Gold
• Gold is traded 8 to 1 with Platinum
• Gold is traded 12 to 1 with Mithril
• Platinum is traded 8 to 1 with Pladium

Standard Weights of Trade Metals

• Coin - 70 Grains or 4.5359g (100 per pound)
• Ounce - 6.25 Coins to an Ounce
• Rod - Uncut Coin rod, valued at 20 Coins of the same metal
• Bar - Stamped golden bar worth 50 Coins of the same metal
• Pound - 100 coins worth of metal
• Stone - 14 pounds of metal, also called a brick

Rare Metals

Platinum, Mithril and Palladium. These metals are worth much more than gold, these Rare Metals are used in very large exchanges, large kingdoms may have these coins but kings and the very highest of royalty will be in possession of them.

Standard Exchange Rates - Uncommon & Rare Metals

Still based on a Coin Exchange Rates for normal sized 4.5359g coins of pure metal. These metals are much more rarely seen.

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Coin	sp	ep	gp	pp	mp	dp
Silver (sp)	1	1/10	1/20	1/160	1/240	1/1280
Electrum (ep)	10	1	1/2	1/16	1/24	1/128
Gold (gp)	20	2	1	1/8	1/12	1/64
Platinum (pp)	160	16	8	1	2/3	1/8
Mithril (mp)	240	24	12	1.5	1	5/16
Palladium (dp)	1280	128	64	8	3.2	1