There are a lot of calculators online for performing all kinds of functions from simple addition to solving complex equations. Calkoo is a website that offers forty-three free online calculators for a variety of functions. The list of calculators that Calkoo is divided into ten categories. Those categories are mathematics, measurement & conversion, saving & investing, capital budgeting, cost of capital, wages & taxes, financial analysis, health, loan & leasing, and stock analysis.

Applications for Education
One of my favorite activities in middle school and high school was the stock market simulation activities that two of my teachers had us do. Calkoo offers a good set of calculators that could be used for stock market simulation activities. Of course, if you just need some basic online calculators for your students to use Calkoo puts a bunch of good ones in one place for you.

Here are five free scientific calculators you might also want to try.