Influence Point

Influence Points, or IP, are earned at the end of each game a player finishes. The amount of IP gained depends on the outcome of the game, the game type and the length of the match. Influence points can be used to permanently unlock champions, runes or additional runebook pages in the Riot Store.

Determining Factors
Since patch V1.0.0.111, the amount of Influence Points awarded for a given match depends on these rules:
 * It increases linearly with the duration of the game.
 * Any match longer than 55 minutes will have the same reward as a 55 minutes long match.
 * For a win, the reward is approximately: 18.193 IP + 2.312 per minute IP.
 * For a loss, the reward is approximately: 15.401 IP + 1.430 per minute IP.
 * An active IP Boost doubles the reward.
 * A custom game has a penalty of 25%.
 * Co-op vs. AI matches have penalties depending on the summoner level and difficulty.
 * Summoner level 1-9: No penalty.
 * Summoner level 10-19: 25% penalty on beginner.
 * Summoner level 20-29: 50% penalty on beginner.
 * Summoner level 30: 75% penalty on beginner.
 * Summoner level 15-30: 25% penalty on intermediate.
 * Co-op vs. AI and Custom games share a limit timer. They both yield no IP after 180 minutes of gameplay in a 22 hours period. (For a summoner above level 10?)
 * A win, in any game type except custom, will award the "first win of the day" bonus if available. This bonus is a fixed 150 IP which is not affected by boosts or penalties. When awarded, this bonus becomes unavailable for 22 hours.

Prices
For a table listing the IP prices of all the champions, please see here.

For a table listing the IP prices of all runes, please see here.

The IP price of an additional runebook page is 6300.

Trivia

 * Runes can only be bought with IP.
 * Skins and bundles cannot be bought with IP.
 * The maximum amount of IP won from a match is:
 * WIN (first win, 55+ mins match, IP boost(timed and per win)) 150 + 145 + 145 + 145 = 585 IP (730 on a double-IP weekend)
 * LOSS (55+ mins match): 95 = 245 IP