Maths Calculators
Everyday sums solved step by step: percentages, discounts and proportions.
Percentage Calculator
Work out percentages, discounts and increases in one place: what a percentage of a value is, what percentage one figure is of another, the percentage change between two values, and what a price becomes after a discount or an increase.
Open calculator →Discount Calculator
Enter the original price and the discount percentage and see the final price and your saving at once. It also works backwards, to find the discount percentage from two prices, and for the chained discounts of the sales season.
Open calculator →Percentage Increase Calculator
Enter a starting value and a final value to see how much it rose in per cent, or a value and a percentage to get the new amount after the rise. It works for decreases too: salaries, prices, rents, bills.
Open calculator →Rule of Three Calculator
Enter the three known values and the calculator finds the fourth: the direct proportion ("if 3 kg cost €12, 5 kg cost X") and the inverse one ("if 4 workers take 6 days, 8 workers take X"), with the formula and the working written out.
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About the maths calculators
These are the operations that come up constantly and that almost nobody remembers: what a percentage of an amount is, what percentage one figure is of another, what is left after a discount, how to find the fourth term of a proportion. Each calculator shows the full working, so you can repeat it without the tool.
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The calculators provide educational estimates and do not constitute financial advice.