Escape Artist (Dex; Armor Check Penalty)
The table below gives the DCs to escape various forms of restraints.
Ropes: Your Escape Artist check is opposed by the binder's Use Rope check. Since it's easier to tie someone up than to escape from being tied up, the binder gets a +10 bonus on his or her check.
Manacles and Masterwork Manacles: The DC for manacles is set by their construction.
Tight Space: The DC noted on the table is for getting through a space where your head fits but your shoulders don't. If the space is long you may need to make multiple checks. You can't get through a space that your head does not fit through.
Grappler: You can make an Escape Artist check opposed by your enemy's grapple check to get out of a grapple or out of a pinned condition (so that you're only grappling).
Action: Making an Escape Artist check to escape from rope bindings, manacles, or other restraints (except a grappler) requires 1 minute of work. Escaping from a net or an animate rope, command plants, control plants, or entangle spell is a full-round action. Escaping from a grapple or pin is a standard action. Squeezing through a tight space takes at least 1 minute, maybe longer, depending on how long the space is.
Try Again: Varies. You can make another check after a failed check if you're squeezing your way through a tight space, making multiple checks. If the situation permits, you can make additional checks, or even take 20, as long as you're not being actively opposed.
Special: If you have the Agile feat, you get a +2 bonus on Escape Artist checks.
Synergy: If you have 5 or more ranks in Escape Artist, you get a +2 bonus on Use Rope checks to bind someone.
If you have 5 or more ranks in Use Rope, you get a +2 bonus on Escape Artist checks when escaping from rope bonds.
The character can pass through spaces smaller than his or her head, or even through a wall of force.
Extremely Tight Space: This is the DC for getting through a space when one's head shouldn't even be able to fit; this can be as small as 2 inches square for Medium-size creatures. Halve this limit for each size category less than Medium-size; double it for each size category greater than Medium-size. If the space is long, such as in a chimney, multiple checks may be called for.
Pass through Wall of Force: This allows a character to find a gap of weakness in a wall of force (or similar force effect) and squeeze through it.
Source: SRD 3.5 Combined Skills