Since a normal reach weapon doubles the user's natural reach, I'd say a whip triples the user's natural reach.SRD said:Reach Weapons: Glaives, guisarmes, lances, longspears, ranseurs, spiked chains, and whips are reach weapons. A reach weapon is a melee weapon that allows its wielder to strike at targets that aren’t adjacent to him or her. Most reach double the wielder’s natural reach, meaning that a typical Small or Medium wielder of such a weapon can attack a creature 10 feet away, but not a creature in an adjacent square. A typical Large character wielding a reach weapon of the appropriate size can attack a creature 15 or 20 feet away, but not adjacent creatures or creatures up to 10 feet away.
Romnipotent said:... its 5ft per size category in 3rd ed.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.