Frank Ianni finally gets his own molar mass calculator after being unable to find a suitable one for so long. Calculate molar masses and percent composition with this easy-to-use calculator. You'll never look up the atomic mass of an element in a periodic table ever again! A new and unique keyboard, made for inputting elements, allows you to efficiently and accurately enter any formula. Simply tap on a key for a 1 letter element symbol such as "C", "F", or "N". Drag one key to another to input a 2 letter element symbol such as "Fe", "Cu", or "He".