=Personal FinanceTOOLKIT

Inflation

Compare two CPI index values you supply from the same series.

Your numbers

Enter your numbers to see the result.

How Inflation works

Equivalent amount = past amount × comparison CPI index ÷ past CPI index. You supply index values from one consistent series; no historical CPI data is preloaded.

A worked example

These sample values illustrate the calculation. Use your own numbers in the calculator for your result.

Example inputs
Past amount
100
Past year
2020
Comparison year
2025
Past CPI index (enter sourced value)
100
Comparison CPI index (enter sourced value)
120
Equivalent amount at comparison CPI
$120.00
CPI change
20%

Assumptions and limits

The sample CPI indices illustrate the formula. They are not historical data for the displayed years.

Educational estimate only. This is not personalized financial, investment or tax advice.