Amazon.com The simple truth is that some of us were built were math, and some of us weren’t. If calculating how many gallons of paint you’ll need makes you want to hire the job out, this little calculator will change your mind. All you have to do is measure and tell it what you want to know. It’s programmed to figure out quantity needed for all kinds of materials: bricks and blocks, wallboard, gravel, lumber, paint, roof shingles, studs, tile and wallpaper. You tell it specifical…