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: Co-op vs. AI matches have penalties depending on the summoner level and difficulty.
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 * An active Wins IP Boost gives you a flat amount of IP equivalent to the most base IP you could get from an extremely long game (for whichever game mode you are playing).
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 * When you surrender you get less ip then what your suppose to get !
 * 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 level 15 or above)
 * 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.
 * The rule for minimum IP reward does not apply (a match shorter than 25 minutes will give less IP than a match of 25 minutes).

In the Patch V1.0.0.133 (Rise of the Bots), the Influence Points rewards for Co-op vs. AI matches have increased. The following are the new values for IP penalty for AI matches.

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.

Trivia

 * Runes can only be bought with IP.
 * Skins and bundles can only be bought with RP, not with IP
 * The maximum amount of IP won from a match is:
 * Win: (first win of the day bonus, 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 IP
 * The actual Co-op vs AI penalities differ from what was announced in the patch notes.
 * Actual penality was found by extracting Normal IP values from the graph and testing to gain IP values on Co-op games (only for summoner level 30).