Percentage change
Your result25 %
(100 − 80) ÷ 80 × 100. A negative result is a decrease.
Change = (new − original) ÷ original × 100
Subtract the original value from the new value, divide by the original value, and multiply by 100.
Worked example
A change from 50 to 65 is an increase of 15. Relative to the starting value, 15 ÷ 50 × 100 = 30%. The denominator is 50, not 65.
Try it with your own numbers
Use the Percentage Change Calculator to check another example. Read the input labels carefully and keep units consistent.
Before you use the answer
Choose the correct starting quantity and keep full precision until the final step. An arithmetic result describes the numbers entered; the usefulness of the result depends on accurate measurements and the assumptions in the calculation.
