Speed
Your speed is how far you can move with a single move action. Your speed depends mostly on your race and your armor type, though magic and equipment can also impact it. Wearing heavy armor or carrying too much can reduce your speed (see Armor and Carrying Capacity in Chapter 7 for more details).
If you use two move actions in a round (sometimes called a “double move”), you can move up to double your speed. If you spend the entire round running (using the run action; see page 248), you can move up to quadruple your speed.
A creature’s land speed refers to how far it moves across the ground with its appendages. Most Medium creatures have a land speed of 30 feet (6 squares). If a creature has additional movement speeds, such as a climb speed or a fly speed, those speeds are listed in the creature’s statistics separately (see Additional Movement Types on page 258). If a rule references speed without specifying a movement type, it refers to whatever movement type you are using.
Source
Core Rulebook pg. 255