Choose a Calculator
Percentage Calculator
Find what X% of Y is. The most common percentage calculation.
Percentage Increase
Calculate the result after increasing a number by a given percentage.
Percentage Decrease
Calculate the result after decreasing a number by a given percentage.
Percent Change
Find the percentage change between two values — up or down.
Discount Calculator
Work out the sale price after applying a percentage discount.
How Percentage Calculations Work
A percentage represents a fraction of 100. To find X% of a number, multiply the number by X and divide by 100. Percentage increase and decrease apply this idea in reverse — adding or subtracting the calculated amount from the original value.
These formulas are used in finance, shopping, statistics, and everyday life. Each calculator above shows its own worked examples so you can double-check your results.