How it works
Use the original figure as the reference. A move from 80 to 100 is +25%; a move from 100 to 80 is −20%. Percentage changes are not symmetric.
FormulaChange (%) = (new − old) ÷ |old| × 100.
EVERYDAY / GROWTH & CHANGE
← All toolsPercentage change
Find the increase or decrease between two values, relative to the starting amount.
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Percentage change: a worked example
With original value 80, new value 100, the percentage increase is 25%.
| Original value | 80 |
|---|---|
| New value | 100 |
| Percentage increase | 25% |
|---|---|
| Difference | 20 |
| Original value | 80 |
| New value | 100 |
Amounts are shown in US dollars for illustration. Choose your own currency in the calculator above; it labels amounts and does not convert them.
Make the numbers useful
Try changing one input at a time. The live result helps you see which assumption has the greatest effect.
Use Save scenario A, change an input, and compare both results side-by-side. You can also share your settings using a link.
Modelled results are estimates. Independently check decisions involving health, finances or safety.
Frequently asked questions
How is the percentage change calculated?
Change (%) = (new − old) ÷ |old| × 100. Use the original figure as the reference. A move from 80 to 100 is +25%; a move from 100 to 80 is −20%. Percentage changes are not symmetric.
What does the percentage change example show?
With original value 80, new value 100, the percentage increase is 25%. Difference: 20; Original value: 80; New value: 100.
What assumptions and limits apply?
This is an estimate based on the inputs and assumptions shown on this page, not professional advice. Check anything with financial, health or safety consequences independently.
Is my data private?
Yes. Calculations run in your browser and your numbers are not sent to a server. A share link contains the inputs you choose to share, so check it before sending it to anyone.