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Apps Store - Download Apps for Windows. Online Scientific Calculator. Download eCalc Scientific Calculator Windows VersionMac OSX VersionView More Downloads Online Calculator and Math Help eCalc is a free and easy to use scientific calculator that supports many advanced features including unit conversion, equation solving, and even complex-number math. eCalc is offered as both a free online calculator and as a downloadable calculator. Input Mode (Algebraic vs. RPN) The online calculator operates in either algebraic input (default mode) or RPN input. The calculator mode is set by clicking on the "ALG/RPN" symbol in the status bar or by changing the mode inside the menu dialog box.
Algebraic Mode Algebraic input mode is commonly referred to as "infix notation" and is widely used by most handheld calculators. Graphical Button and Keyboard Support The online calculator supports data entry through either a graphical button or through the use of traditional computer keyboard keys. Stack Pallet Intro Basic Functions Addition Subtraction Multiplication Division Sign Square.