From the developer: "AceIT Calculator is a FREE, comprehensive, easy to use expression calculator, featuring a unique workspace where you can directly enter your expressions to be evaluated. The workspace stores all of your inputs and results, letting you examine and edit any of your calculations. The calculator supports more than one hundred built-in functions, including algebraic, transcendental, statistical, financial, calculus, & engineering functions. It also includes over thirty commonly used physical constants and several hundred unit conversion factors. Another key feature is the ability to store your calculation results in an unlimited number of variables, helping you manage complex calculation sequences. The calculator's broad range of features as well as its ease of use will greatly enhance your daily productivity."