About the Inflation Rate Calculator
Calculate the inflation rate between two CPI values or prices, and the average annual rate over several years.
Also known as: cpi inflation, calculate inflation rate, price index change.
How to use this calculator
- Enter starting cpi / price, ending cpi / price, years between.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Inflation = (CPI₂ − CPI₁) / CPI₁
Worked example
Using the values pre-filled in the calculator above:
- Starting CPI / price = 258.8
- Ending CPI / price = 310.3
- Years between = 5
the calculator returns:
- Total inflation: 19.9%
- Average annual rate: 3.6964%