What is the level cap in skyrim?

As of Patch 1.9, the level cap of 81 has been removed. (This is an update to the current answers, regarding Patch 1.9's changes.) At higher levels, leveling up happens much more slowly. Level increases in Skyrim follow a formula (detailed here). read more

The level cap in vanilla Skyrim is 81. That is the level the player reaches when every skill reaches 100, and no more skill leveling is possible. However, with the Dragonborn DLC, it is possible to reset a skill to Legendary, resetting your skill level to 15 and reclaiming all the perks you spent on that skill. read more