Percentage Increase Calculator
Enter the old and the new value to see the percent change between them and the absolute difference — salary raises, price changes, revenue growth, follower counts, anything that compares two numbers. The "apply a percentage" tab answers the reverse question: what does a value become after growing (or shrinking) by a given percent? Enter a negative percentage for a decrease.
Frequently asked questions
How do I calculate percentage increase?
(New value − Old value) ÷ Old value × 100. If a salary goes from 40,000 to 46,000, the increase is (46,000 − 40,000) ÷ 40,000 × 100 = 15%. A negative result means a decrease.
Why aren't increase and decrease percentages symmetric?
Because the base changes: going from 40 to 50 is a 25% increase, but going from 50 back to 40 is only a 20% decrease. For the same reason an investment that drops 50% must gain 100% to recover.
Is a percentage increase the same as percentage points?
No. If an interest rate moves from 20% to 25%, that is 5 percentage points, but the percentage increase is (25 − 20) ÷ 20 × 100 = 25%. The two are often confused in headlines; this tool computes the percentage change.
Why is there no result when the old value is zero?
Percent change from zero is mathematically undefined (division by zero). In that case express the change as an absolute difference instead.