IonCalc is an expression based calculator, and very easy to use, keeps the last 10 expressions for reuse or edit. As a graphics calculator, IonCalc displays graphical representations of expressions, formulas or data in different chart types. The entire state of IonCalc can be saved and read, so you can continue with your previous work when you launch the program. Easily converts units with a single command. It has a built-in, simple and powerful programming language, similar to Basic, to add functions for use in expressions or your own functions.