While the Texas Instrument TI-84 Plus is also available in a black-and-white version for slightly less money, we think the sharp backlit screen of its color edition is worth the expense—especially for college students and math professionals.
It’s a great choice for high school students, too. It comes loaded with MathPrint, which converts the equations to the same format you see in textbooks, and it’s approved for use during PSAT, SAT, and ACT college entrance exams, as well as AP exams that allow graphing calculators. It has a bunch of applications to expand the calculator’s functionality, as well as lots of images you can use for graphing.
Plus, it has a rechargeable battery that powers up with a USB cable. The TI-84 Plus is more expensive than most of the other models on this list, but it’s one of the best calculators money can buy.