📐 Maths Calculators UK
Maths calculators for percentages, statistics and algebra — quick, accurate results for everyday calculations and schoolwork, with the working shown so you can check each step.
Percentages, standard deviation and quadratic equations turn up constantly — in schoolwork, in comparing prices, in analysing data — and small mistakes in the method (not just the arithmetic) are surprisingly common. Percentage change and percentage points are frequently confused with each other, standard deviation calculations differ depending on whether you're working with a full population or a sample, and the quadratic formula trips people up on sign errors far more than on the maths itself.
These calculators are built to be transparent about method as well as the answer, so they work equally well as a quick check for schoolwork or a fast, reliable tool for everyday number-crunching.
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Frequently asked questions
What's the difference between percentage change and percentage points?
Percentage change describes a relative change (e.g. a price rising from £50 to £60 is a 20% increase). Percentage points describe an absolute difference between two percentages (e.g. an interest rate moving from 5% to 7% is a 2 percentage point rise, not a 40% one) — mixing the two up is one of the most common statistics mistakes.
Does the standard deviation calculator use population or sample formulas?
It's worth checking which your specific task requires — population standard deviation (dividing by n) is used when your data is the entire group you care about, while sample standard deviation (dividing by n−1) is used when your data is a sample used to estimate a wider population.