SYSTEM REFERENCE DOCUMENT 3.5
There are three movement scales, as follows.
Modes of Movement: While moving at the different movement scales, creatures generally walk, hustle, or run.
Walk: A walk represents unhurried but purposeful movement at 3 miles per hour for an unencumbered human.
Hustle: A hustle is a jog at about 6 miles per hour for an unencumbered human. A character moving his or her speed twice in a single round, or moving that speed in the same round that he or she performs a standard action or another move action is hustling when he or she moves.
Run (x3): Moving three times speed is a running pace for a character in heavy armor. It represents about 9 miles per hour for a human in full plate.
Run (x4): Moving four times speed is a running pace for a character in light, medium, or no armor. It represents about 12 miles per hour for an unencumbered human, or 8 miles per hour for a human in chainmail.