eCalc is an easy to use scientific calculator with many advanced features including unit conversion, complex number math, equation solving, and even support for both algebraic and RPN operating modes. The calculator has an attractive user interface with large buttons, an easy to read multiline display, and support for six color themes.

eCalc is a free Windows calculator with basic and scientific functions. The calculator is designed with a high level of aesthetics, including large buttons and an easy to read display. The calculator operates with a frameless border and stays open above your other programs - making it an ideal side companion tool. Notable features of this calculator include memory functions, percent, sqrt(x), sqr(x), inv(x), and an engineering exponent key.