An iPhone/iPod application that estimates the number of gallons of paint you will need for a given room. You input any combination of walls and/or ceiling, and/ or sloping (triangled areas) to compute square footage. You can also subtract windows and doors in the excluded section.

Then input the square footage of one gallon of paint (varies by manufacturer) and Paint Calc will display total square footage by ceiling and walls with corresponding number of gallons needed of paint.