FAS Calculator is an expression calculator which allows you to directly enter an expression to be evaluated. More than one hundred functions are supported, including algebraic, transcendental, trigonometric, hyperbolic, engineering functions. FAS Calculator includes functions that allow you to perform numerical integration, differentiation, and root-finding. The calculator allows you to perform some operations with complex values. You may perform calculations not only in decimal but also in binary, hexadecimal and octal numeric bases. Also included is a comprehensive unit converter that can convert between any two units in metric, English, and US systems. The calculator's intuitive, easy-to-use interface as well as its broad support of common mathematical, engineering functions makes it a must-have for both students and professionals.