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Percentage Change Calculator
Compare two numbers, such as last month's and this month's revenue, and get the percentage change.
Change
How it’s calculated
The difference between the two values is divided by the old value. A negative result is a decrease.
change % = (new − old) ÷ |old| × 100
Worked example
Monthly revenue rising from 8,400 to 10,290 is an increase of 1,890, or 22.5%.
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Questions
How do I calculate percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100.
Why is a 50% drop not undone by a 50% rise?
The rise is calculated on the smaller number. After halving, you need a 100% increase to get back.
Doing these numbers every month? Accounting software can automate invoices, reminders and tax reports.
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