Inflation Index Rebasing Tool
Normalize one index to another reference period.
Inflation Index Rebasing Tool: Scenario Inputs
Annual percentage rate or benchmark index change.
Inflation & Purchasing Power Analysis
Over 3 years at 3.5% inflation, a $75,000 salary requires $83,154 to retain equal purchasing power. Without matching raises, your real compensation experiences an effective reduction of $7,355 (-9.81%).
Need complete multi-year compound modeling?
Run detailed comparisons, custom CPI series, and visual breakdown charts.
How Inflation Index Rebasing Tool Works?
The Inflation Index Rebasing Tool works by dividing every value by the reference-period value and multiplying by 100.
Paste the series
Enter index values by period, or load a published series.
Pick the new base
Choose the period that becomes 100, or an average of several periods.
Rescale all values
The tool divides each value by the base value and multiplies by 100.
Export the result
Copy the rebased series into reports and spreadsheets.
Inflation Index Rebasing Tool Formula
The Inflation Index Rebasing formula divides each index value by the new base value and multiplies by 100.
Rebasedt = Indext ÷ Indexnew base × 100
Variables
- Indext
- Original value in period t
- Indexnew base
- Original value in the chosen base period
Worked example
Rebasing CPI-U to 2019 = 100 turns the 2023 annual average of 304.702 into 119.18. The 2019-to-2023 change stays 19.18% on both scales.
Inflation Index Rebasing Tool Conversion Table
This table rebases 5 CPI-U annual averages from 1982–84 = 100 to 2019 = 100.
| Year | Original (1982–84 = 100) | Rebased (2019 = 100) | Change from 2019 |
|---|---|---|---|
| 2015 | 237.017 | 92.71 | -7.29% |
| 2017 | 245.120 | 95.88 | -4.12% |
| 2019 | 255.657 | 100.00 | +0.00% |
| 2021 | 270.970 | 105.99 | +5.99% |
| 2023 | 304.702 | 119.18 | +19.18% |
CPI-U annual averages: U.S. Bureau of Labor Statistics.
What is Inflation Index Rebasing Tool?
The Inflation Index Rebasing Tool is a tool that rescales an index series so a chosen reference period equals 100. Rebasing changes the level of every value but keeps every percentage change the same.
CPI-U uses 1982–84 = 100, and the PCE index uses 2017 = 100. Rebasing both to the same year makes the 2 series easy to read side by side.
What are the uses of Inflation Index Rebasing Tool?
There are 4 main uses of the Inflation Index Rebasing Tool.
Align 2 series
Put CPI and PCE on the same base year for comparison.
Read values as percentages
Set a hiring year to 100 so each value reads as a percent of that year.
Build charts
Plot several indexes from one common starting point.
Join old and new data
Rebase an old series to match a new series before linking them.
Related Indexes & Geographic Data Calculators
Browse all 140+ toolsCustom CPI Salary Calculator
Use entered price-index values.
CPI-U Salary Calculator
Adjust pay using CPI-U.
CPI-W Salary Calculator
Adjust pay using CPI-W.
Chained CPI Salary Calculator
Use the selected chained CPI series.
PCE-Based Salary Calculator
Adjust pay using the PCE price index.
Inflation Index Comparator
Compare salary adjustments across indexes.