A graphing calculator is a unique tool in math and science. Graphing calculators perform the same functions as a regular calculator, and have more complex functions, like being able to calculate fractions, logarithms, and square roots. There are some big names in graphing calculators that are trusted and have been around for a long time—you may recognize the classic TI-84 from one of your math classes. Online graphing calculators are fairly new, and often free. We’ll go over the best physical and online graphing calculators to help you decide which one is right for you.