"Measure twice, cut once" is one of the many tips you'll hear from anyone that's ever had to build something. Having the right tool for the job is another way to make things go smoother. Since it all starts with the initial measurements and subsequent calculations, the Mobile Pro app from Dewalt is worth considering. This powerful app made for pros has lots of functional calculators and conversion features essential for calculating areas. Beyond those tools, it has lots of other helpful information for referencing common questions. The app lets you save your work or share it with others that are involved in your project. Knowing how many bags of concrete to buy for your slab or how many linear feet of all the materials necessary for building out a room can be done with this awesome app. http://dewalt.cengage.com/MobilePro/download