Decide what hourly rate you want (I charge $45.00-$65.00/hr). You should have a general idea of how long it took you and simply multiply the number of hours by the hourly rate. It may take a while to to get yourself to think hourly but you'll get the hang of it pretty soon or else you'll go out of business. I do sandblasting, vinyl/other stuff (paint) signs and furniture repair/refinishing and sometimes I get my hourly and sometimes I mess up and don't (I'm still close however)but, all in all, you'll get tired of giving away your labors real quick.
