Is there a rule for that somewhere? Pounds per point of strength.
For example, is this correct?:
http://www.d20srd.org/srd/carryingCapacity.htmLifting and Dragging
A character can lift as much as his or her maximum load over his or her head.
A character can lift as much as double his or her maximum load off the ground, but he or she can only stagger around with it. While overloaded in this way, the character loses any Dexterity bonus to AC and can move only 5 feet per round (as a full-round action).
A character can generally push or drag along the ground as much as five times his or her maximum load. Favorable conditions can double these numbers, and bad circumstances can reduce them to one-half or less.