Overview
What this tool does
Inflation Calculator: Estimate purchasing-power changes from versioned official CPI data or an explicit custom annual rate. Dated CPI datasets Custom-rate mode Visible formula and assumptions
- Prepare 100 units in a selected start year and end year.
- Local calculation over versioned official CPI datasets plus custom-rate mode.
- Confirm that the result shows the CPI-adjusted value and cumulative change for that dated series, then review the stated limits before copying or downloading anything.
Method
How this tool works
Local calculation over versioned official CPI datasets plus custom-rate mode. The calculation or transformation is deterministic for the same supported input, and the worked example below shows the intended scope.
Example
Inflation Calculator worked example
Input: 100 units in a selected start year and end year.
Expected output: the result shows the CPI-adjusted value and cumulative change for that dated series.
Limits
Assumptions and limits
- Inputs and files stay in this browser and are excluded from analytics.
- The worked example assumes 100 units in a selected start year and end year.
- Units, dates, rates, selections and source-file quality are taken exactly as entered unless the workspace labels a default.
- Inflation Calculator is a deterministic planning scenario based only on the values entered.
- It is not approval, a quote, investment advice, tax advice or a forecast of actual returns.
Privacy
Local processing
Values and files are processed locally in this browser unless the workspace explicitly identifies an optional network feature. Great Future does not intentionally collect tool inputs.
Sources
Method references and scope
Internal review owner: Great Future Financial Methods Review.
- Consumer Price Index for All Urban Consumers, series CUUR0000SA0 — U.S. Bureau of Labor Statistics. Reviewed 2026-08-29. Pinned annual CPI-U averages used by the dated U.S. inflation example.
Questions
Frequently asked questions
What input should I prepare for Inflation Calculator?
Prepare 100 units in a selected start year and end year. Keep the original values or file available so you can compare the result.
What should I verify after using Inflation Calculator?
Verify that the result shows the CPI-adjusted value and cumulative change for that dated series. Inflation Calculator is a deterministic planning scenario based only on the values entered.
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