If the Windows Calculator does not suffice your needs, here another Scientific Calculator called eCalc – Online Scientific Calculator which can be accessed right from your browser without the need of any plugins. It also has the functions of a basic calculator.It supports complex calculations like Unit Conversion, Equation Solver, Base Conversion, Constants also.

eCalc  has 2 input modes Algebraic and RPN Mode, It also stores the results of the past calculations in a stack and can be accessed by scrolling up and down, 4 recent results are available on display.

If your on the Windows Platform there is also a desktop version of the basic calculator. It’s completely free and it runs on your computer without requiring an internet connection and a portable version of eCalc Basic is also available.

Check out eCalc to see how to use it.