Wolfram Research, Inc.
Mathematica as a Calculator
You can use Mathematica just like a calculator: you type in questions, and Mathematica prints back answers.
An important feature of Mathematica is its ability to handle formulas as well as numbers.
You can use Mathematica to make 2D and 3D graphics.
You can access many of the calculator features of Mathematica just by pushing buttons in standard palettes. Click this hyperlink to check out the Basic Calculations palette.