25.00% is the example result. A percentage growth rate depends on the starting base. A small starting amount can produce a large rate even when the absolute change is modest.
Measure the percentage increase or decrease from a starting value to an ending value. A zero starting value makes the percentage change undefined.
Preserving the meaning of a conversion or working record
A percentage growth rate depends on the starting base. A small starting amount can produce a large rate even when the absolute change is modest. A conversion is useful when the source value and unit remain traceable. Dates, elapsed time, percentages and ratios each have their own convention. Rounding can change a schedule or quantity when the output is copied into another system.
Source and result record
For percentage change, retain Starting value, Ending value together with the output. Record the date of the source values and the unit convention used in the form. That record separates a change in the underlying case from a change in how the information was entered. A saved result without its source values cannot show which assumption produced it.
Example with the supplied inputs
Starting value: 100; Ending value: 125. Result: 25.00%. The values are illustrative.
Compare one changed input
Starting value changes from 100 to 110. The result becomes 13.64%. All other inputs remain fixed.
Calculation rule
Result = (([Ending value] − [Starting value]) ÷ ([Starting value])) × 100
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Starting value | 100 | Use the source quantity represented by starting value. Keep the counted population fixed and avoid mixing a unit value with a period total. |
| Ending value | 125 | Use the source quantity represented by ending value. Keep the counted population fixed and avoid mixing a unit value with a period total. |
Output: 25.00% is the example result. A percentage growth rate depends on the starting base. A small starting amount can produce a large rate even when the absolute change is modest. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Starting value, Ending value. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Starting value on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 25.00%.
Change Starting value from 100 to 110 while keeping every other value fixed. The result becomes 13.64%. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026