Maximize Spell

Maximize Spell [Metamagic]

You can cast spells to maximum effect.

Benefit: All variable, numeric effects of a spell modified by this feat are maximized. A maximized spell deals maximum damage, cures the maximum number of hit points, affects the maximum number of targets, etc., as appropriate. For example, a maximized Fireball deals 6 points of damage per caster level (up to a maximum of 60 points of damage at 10th caster level).Savng throws and opposed rolls (such as the one you make when you cast dispel magic) are not affected, nor are spells without random variables. A maximized spell uses up a spell slot three levels higher than the spell's actual level.

Source: Player's handbook