Math
Percentage
Find a percentage of any number.
Calculators / Math / Percentage change
Annual Increase & Percentage Change Calculator
Measure an increase or decrease from an original value.
On this page
Percentage change25%
Absolute change20
Calculator controls
How to calculate
Measure an increase or decrease from an original value.
Change = (new − original) ÷ original × 100
Worked example
Example inputs
Original value: 80 · New value: 100
Example resultPercentage change: 25 % · Absolute change: 20
Assumptions and limits
Requires a positive original value. A negative result means a decrease.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
A positive result means an increase from the original amount; a negative result means a decrease. The original value is the comparison baseline. For one year of data, this also works as an annual increase calculator.
When this tool is useful
Compare sales between periods, calculate an annual increase, or quantify a change in a quoted price.
Understanding your inputs
| Input | What to enter |
|---|---|
| Original value | Enter a number of at least 0.000001 and no more than 1000000000000. |
| New value | Enter a number of at least -1000000000000 and no more than 1000000000000. |
Frequently asked questions
How do I calculate an annual increase?
Enter the earlier annual value as the original amount and the later annual value as the new amount. The percentage-change result is the annual increase or decrease for that interval.
Why can’t I start from zero?
Percentage change divides the difference by the original value. A zero baseline makes that division undefined; use the absolute change instead.
Does a 20% increase reverse a 20% decrease?
No. Starting at 100, a 20% decrease gives 80; increasing 80 by 20% gives 96. The baseline changes between the two operations.