Coins

Coins are the main unit of currency in Terraria. They are primarily used for NPC transactions, but can also be used as ammunition for the Coin Gun. There are four types of coins: Copper Coins, Silver Coins, Gold Coins, and Platinum Coins.

Coins can be obtained by killing enemies, interacting with NPCs, or finding them in multiple forms of loot. Despite coins appearing as the materials "Copper", "Silver", "Gold", or "Platinum", they are unrelated to their respective ore types and cannot be crafted from them.

The coin value an enemy drops upon death is calculated from fixed values in the game code, with some random variation. See NPC drops § Coin Drops for further information.

Storage
Inside the player's inventory, coins have their own special slots, although it is possible to move them into normal inventory slots.
 * Coins picked up from the environment, or "shift-clicked" from a storage item, will automatically combine into their higher denominations, if possible.
 * For example, if the player picks up, they will end up with in their inventory instead.
 * Similarly, a player holding and picking up another 15, will end up with.
 * Using "Quick Stack" on an open Piggy Bank, Money Trough, Safe or (collectively, a "bank"), gives special behavior: If there is already at least one coin (of any value) in the bank, all coins in the player's main inventory and coin slots will be moved to the bank. All coins moved, and all coin stacks in the bank, will be combined into the highest possible denominations and minimum number of stacks.
 * Using "Quick Stack To Nearby Chests" will not send coins to nearby banks, even if they already contain the same denomination.
 * Using "Quick Stack" (or "Quick Stack To Nearby Chests") on a storage item, like a chest, will treat coins like any other item, and will not move coins from the player's coin slots.
 * However, coins do not auto-combine when manually moved into a storage item; if there is no room in the storage item, some will be left in the player's hand or coin slots. Stacks of 100 coins should then be manually crafted into the next denomination. (See also the warning below regarding Deposit All.)
 * In the early game, before receiving a bank, it may be inevitable to store coins in a chest. Deposit All does place coins, but if the chest is already full when pressing Deposit All, higher denominations may be destroyed if a stack for that coin does not exist.
 * Coins may be spent in NPC transactions directly from the player's banks.

Drops Upon Death

 * Upon a player's death in Softcore (the default mode), half  of all of the stacks of coins in a player's inventory are dropped, rounded up to the nearest whole coin. For example, if the player possesses  in one stack, it will be dropped. If it is instead, 5   will be dropped.
 * Upon player death in or, all coins are dropped, regardless of how the player died.
 * Being killed by a player-wielded weapon will not cause the player to drop any coins in Softcore, even if recently damaged by an enemy.
 * This includes accidentally blowing oneself up with explosives.
 * Forms of accidental death, such as fall damage or Chaos State, will cause coins to drop.
 * Dying from the player's own projectile after having it reflected by an enemy (such as a ) will also result in coins being dropped.
 * In, enemies can pick up coins dropped by enemies or players. If an enemy picks up a players coins and despawns, an icon on the map appears showing the ammount of coins they were carrying. An Enemy that spawns near these icons will have a chance to already be carrying the coins that were lost when the previous Enemy Despawned. Enemies holding dropped coins emit a sparkle effect based on the color of the best coin they are holding.

Trivia

 * Copper, Silver, and Gold Coins are the only items that can have a max stack of 100.
 * often spawn in the Underworld due to the large amount of pots.
 * Due to the transaction properties of portable storage, the maximum amount of money that a player can be considered to be able to spend at one time is exactly 0 on  and 0  on  (40 stacks in Piggy Bank (or ) + 40 in Safe + 40 in  + 54 in inventory, with each stack containing ).
 * Coins have a sell price equal to the amount in their stack, but cannot be sold.
 * The Platinum Coin is the tallest and widest coin its dimensions are 14×16, Gold Coins dimensions are 12×16, Silver Coins dimensions are 12×14 and Copper Coins dimensions are 12×12 being the smallest.
 * Coins can be sold on the Wii U and  Xbox editions. Doing so will do nothing, however.
 * A Platinum Coin is worth 1,000,000 Copper Coins.
 * Placing all of these Copper Coins would take up over 1/20th of a world.
 * Purchasing every NPC item requires:
 * Unknown
 * Although coins are considered as ammunition due to being fired by the Coin Gun, they cannot legitimately be placed in the ammunition slot, only in the coins slot.
 * Coins may be accepted as "payment" in multiplayer.
 * Unknown
 * Although coins are considered as ammunition due to being fired by the Coin Gun, they cannot legitimately be placed in the ammunition slot, only in the coins slot.
 * Coins may be accepted as "payment" in multiplayer.

History
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