CalcGeek is a full functional easy to use scientific calculator. It allows user input expression directly like "3+sin(pi/2)^2". And it also provides lots of mathematical functions, like Trig functions, Hyperbolic Trig functions, Log functions and much more. CalcGeek is written in Java, so that it can run on Windows, Linux, MacOS, and any other platform that support Java virtual machine. It is very easy to use, and suitable for college students.