20.00% 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.
Compare two monthly values to measure the percentage change. This is a single-period comparison, not a compounded annual rate.
Comparing financial amounts on a defined basis
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 financial model is useful when its cash amounts, rate convention and time horizon describe the same case. Interest, return and purchasing power are different outputs. A projection should remain separate from an observed or audited balance.
What the model includes
Result = (([Ending value] − [Starting value]) ÷ ([Starting value])) × 100 Check whether a rate is annual, monthly, simple or compounded. Enter fees only where the form represents them and identify contractual charges that remain outside the estimate. A monthly payment alone does not establish affordability or total ownership cost. Use the result to prepare the next question about terms or assumptions. Tax treatment, lender conditions and valuation evidence require the relevant source documents; they cannot be recovered from a few numeric inputs.
Example with the supplied inputs
Starting value: 10000; Ending value: 12000. Result: 20.00%. The values are illustrative.
Compare one changed input
Starting value changes from 10000 to 11000. The result becomes 9.09%. 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 | 10000 | 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 | 12000 | Use the source quantity represented by ending value. Keep the counted population fixed and avoid mixing a unit value with a period total. |
Output: 20.00% 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 20.00%.
Change Starting value from 10000 to 11000 while keeping every other value fixed. The result becomes 9.09%. 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