If you’re trying to solve those IBM problems from yesterday’s post, you might need the help of a calculator. Luckily, there are free online calculators that you can use.

The first one is a scientific calculator, Calculator Tab, with long-term memory that allows you describe and retrieve saved numbers. Click the tabs on the calculator to see the hidden functions, to save and retrieve the results, or to clear the calculator. There are buttons on the page, above the calculator, to view the calculator in a popup window, and to use the keyboard for input.

Another free calculator is calc5, a graphing calculator. There’s not much on the page when you arrive, but click the samples listed at the right, or enter your own data in the input box.

Filed under: Calculator, Charts, Excel