From the developer: "The Desktop Construction Materials Estimator quantifies the most commonly used building materials in or around the home and is perfect for the avid DIY'er or small jobbing builder. It quantifies bricks, mortar, concrete, plaster, artex, mastic, wallpaper etc. It has full load/save/print capability and also lets you decide how much you want to allow for wastage. It also has an handy metric/imperial converter. This is a DEMO version which allows you all around the software but just doesn't tell you anything! Quite simply it can save you money the very first time you use it by not letting you over buy materials. Try it and see."