With the cost of scientific calculators increasing, some schools facing budget cuts in their mathematics departments may want to try using free online scientific calculators with their students. Here are some suggestions:
Microsoft offers a scientific calculator that you can download for free (Windows only). Microsoft Mathematics 4.0 is a graphing calculator that plots in 2D and 3D. The calculator does many other functions such as solving inequalities, converting units of measure, and performing matrix and vector operations.
Encalc is a free online scientific calculator that describes itself on its homepage as follows, "Encalc is an online scientific calculator. Its strength lies in its ability handle units and dimensional analysis, to define variables and its large database of constants. Parenthesis and scientific formulas are also supported." It explains how different variables and constants function within an equation or formula.
Web2.0calc is another free online scientific calculator. While it doesn''t replace the TI-84 Plus, it can do what an average high school student needs it to do. You don't have to use it on the web site because they offer three widgets that you can use to embed the calculator into your own blog or website.
Speed Crunch is a free scientific calculator application for Windows, Mac, and Linux operating systems. It performs all of the functions necessary for high school Algebra and Geometry courses except graphing. In addition to performing all of these functions, Speed Crunch has a "math book" containing commonly used equations and formulas.
Has anyone tried any of these or know of other free online scientific calculators?