Maths help that shows its working
Math calculators do the arithmetic you would rather not do by hand, and they show the working while they are at it. Some are school staples: fractions, percentages, long division and ratios. Others handle the jobs that turn up in work and daily life, like a GPA across a semester of grades, a slope for a ramp, or a z-score in a statistics assignment.
The honest way to use a page like this is as a checker, not a crutch. Work the problem your own way first if you are learning, then compare. Where a tool shows steps, read them. The fraction calculator lays out how a sum is simplified, the long division calculator writes out every stage, and the statistics tools report the mean, median and spread together so one number never has to carry the whole story.
Everything here is free, works on a phone as happily as on a laptop, and runs entirely in your browser. Nothing you type is sent anywhere or stored. There is no account to create and nothing to install, which makes the page easy to keep open during homework, on a job site or at a shop counter.
You will find 25 math calculators below, grouped by the job they do rather than by topic names from a textbook. Percentage and fraction tools sit next to geometry and statistics, because that is how problems actually arrive: mixed together, usually with a deadline attached. Pick the one that matches your question, enter the numbers slowly (most wrong answers start as typos), and sanity check the result against a rough estimate of your own. If the two disagree, one of them is telling you something worth knowing.