Percentage change
Your result25 %
(100 − 80) ÷ 80 × 100. A negative result is a decrease.
Change = (new − original) ÷ original × 100
Subtract the new value from the original, divide by the original, and multiply by 100.
Worked example
A fall from 200 to 150 is a decrease of 50. Dividing 50 by 200 gives 25%. The signed change calculator reports −25%.
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.
