Cipher Mortar is a concrete calculator with a clean and uncluttered interface. The app is designed to calculate how many bags of concrete are needed to fill a given area. Simply enter the length, width, and thickness of the concrete area, which you can do through the on screen buttons or the keyboard, and select the bag size you want. Cipher Mortar will then tell you how many bags you will need. This inexpensive indie app also supports Apple Watch so you do not even need to take your phone out of your pocket to know how much concrete you will need. No more calculating square feet on a sheet of paper.