Math Calculators

Math calculators turn a written problem into a checked answer in seconds. Most everyday arithmetic comes down to a handful of core ideas: percentages that compare one number with another on a scale of 100, fractions that split a whole into parts, and simple statistics such as an average that describe a set of numbers at a glance. These come up constantly, in discounts and tips, in test scores and grades, in recipes and measurements, and in any moment where you need to read one figure against another and trust the result.

Every tool in this section is built the same way: it states its formula in plain words, walks through a worked example with the rounding it used, and shows each step, so you can follow the maths or redo it by hand. That makes them useful for homework you actually want to understand, for a quick check at work, and for double-checking a figure before you rely on it. For the formulas on their own, see the formula reference.