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Whether you’re a middle schooler starting Algebra I, a college student enrolled in a calculus course, or a professional accountant, having a dedicated calculator is essential. Specifically designed for simple straightforward use, these user-friendly devices allow you to perform a wide range of calculations quickly, and powerful models can even tackle extremely complicated calculus equations. And yeah, when it comes to simple math, sure you can use your smartphone, but there’s something about the physical buttons and single-function design that still makes basic calculators useful to have around. The Best CalculatorsBEST OVERALL TI-84 Plus CE Graphing Calculator $129 TEXAS INSTRUMENTS...

The 12c calculator from Hewlett-Packard is one of those products that is so ubiquitous and familiar that you almost forget it exists, yet at the same time is so different that there's almost nothing like it. Whenever someone pulls it out of a drawer or pocket to do a calculation, no matter how trivial, you know you are dealing with a professional. Remarkably, it has been in continuous production for over 35 years, with very few changes. While there are now fancier and in some ways more sophisticated calculators, such as with screens for doing graphs, the 12c remains a...

In an industry where a year or two can be an eternity in a product's life span, one unsung product has stood the test of time. While other companies were unveiling their latest futuristic gadgets at the recent Consumer Electronics Show, Hewlett-Packard Co. was showing off a relic: the little HP 12c calculator, which the company says is the oldest consumer electronic device still in production. It's still going strong. H-P first started selling the financial calculator in 1981, the same year IBM Corp. introduced the personal computer. Today, with very few changes, the 12c is still H-P's best-selling calculator....