Percentage Increase Calculator

Percentage increase measures growth between an original and a new value: subtract the old value from the new, divide by the old value, and multiply by 100. A price going from €80 to €100 is a 25% increase.

Note the asymmetry of percentages: a 25% increase followed by a 25% decrease does not return to the start. This tool is useful for salary negotiations, sales growth, inflation tracking and investment returns — for the latter, the ROI calculator gives the same math with finance-friendly labels.