All calculators

Fill in any two of the three boxes and the third works itself out: what is P% of X, X is what percent of Y, or X is P% of what.

=15% of 200 is 30

How much did something go up or down, in percent? Enter the old and new values, or a value and a change to find the other.

=From 80 to 100 is a 25% increase

Add or take away a percentage: a 10% hike on a salary, 18% off a price, or find what the number was before the change.

=50,000 increased by 12% is 56,000

Compare two numbers when neither is the starting point. The difference is measured against their average, so the order doesn’t matter.

=150 and 120 differ by 22.22%

Type a percent, a decimal or a fraction and see the other two. Fractions are simplified, so 37.5% becomes 3/8.

=37.5% = 0.375 = 3/8

Find the sale price, how much you save, or what discount you’re really getting. Any two of price, discount and final price.

=2,499 with 40% off is 1,499.40

Add GST to a price or take it out of an inclusive one, with the CGST and SGST split. Works for VAT and any sales tax too.

=1,000 plus 18% GST is 1,180

Price a product for the margin you want, or check the margin and markup on what you already sell.

=Selling at 800 from a cost of 600 is a 25% margin

The steady yearly growth rate that turns a starting value into an ending value. Fill in any three of the four boxes.

=100,000 growing to 250,000 in 5 years is 20.11% a year

Turn exam marks into a percentage, or work out how many marks you need to reach a target score.

=432 out of 500 is 86.4%