Percentage Change Calculator
100% PrivateCalculatorsMeasure how much a value grew or shrank between an old figure and a new one, as a percentage.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
Formula: (new - old) / old x 100. Results are shown to two decimal places.
- 1Enter the old (starting) value.
- 2Enter the new value.
- 3Read the percent change, the absolute change and whether it is an increase or a decrease.
The change is +20, and the percent change is +25.00%: (100 - 80) / 80 x 100. Run it the other way, from 100 down to 80, and the same 20-point move is a 20% decrease, because the base is bigger. That asymmetry is normal and worth knowing.
- The old value cannot be zero: growth from nothing has no finite percentage.
- The percentage is always relative to the old value, never the new one.
- Negative values are handled with the size of the old value as the base, which keeps the direction honest.
Percentages are relative to where you start. Rising 20 from 80 is measured against 80 (25%), falling 20 from 100 is measured against 100 (20%).
About this tool
The Percentage Change Calculator measures how much a value grew or shrank between an old and a new figure, as a percentage, an absolute change and a direction. It is the right tool for price moves, salary changes, traffic growth and any before-and-after comparison.
Related tools
Part of Ovatly's free tools in Calculators.