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Percent Change & Year-over-Year Calculator

Enter a starting (old) value and an ending (new) value to instantly get the percent change, the year-over-year ratio, and the absolute difference. Great for sales, prices, population, and traffic growth.

Input

Result

Percent change

+20%

Increased

Difference

+20

Year-over-year ratio

120%

How it works

  • Percent change (rate of change) = (new value − old value) ÷ old value × 100 (%). A positive result means an increase; a negative result means a decrease.
  • Year-over-year ratio = new value ÷ old value × 100 (%). 100% means unchanged, and 120% means 1.2× the old value. Percent change = ratio − 100.
  • The difference is 'new value − old value', the absolute amount of change. A plus sign is shown when the new value is larger.
  • When the old (base) value is 0, the percent change and ratio cannot be computed because you would divide by zero (no result is shown).
  • It is not limited to last year vs. this year — use it for any two points in time (last month vs. this month, target vs. actual). The percent change and ratio are rounded to two decimal places as a guide.

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