The name of this app is QUICK Estimator, and it is. I created a spreadsheet on my iPhone that does basically the same thing, but input is tedious. This app is great for "quick" estimates on site and I can use my own overage guesses to compensate, for instance, if one gallon of paint only covers 300 sq ft. Needs some tweaking to make it perfect and a strong competitor with another very pricy app, but overall very pleased!!!