Inflation Calculator

Convert an amount between years with U.S. CPI-U annual averages. The result shows the start and end index, the price-level change, and the exact formula so the estimate stays transparent.

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Inflation Calculator

Inflation adjustment inputs

Data source, formula, and limits

The page uses U.S. Bureau of Labor Statistics CPI-U annual averages for all items, U.S. city average. The dataset version is 2026-05-22, last checked against the BLS API on 2026-05-22, and currently stores annual averages through 2025. It converts historical buying power only; it does not forecast future inflation or provide financial advice.

FAQ

What data source does this use?

It uses the U.S. Bureau of Labor Statistics CPI-U series for all items, U.S. city average, stored as annual averages through 2025. The dataset version is 2026-05-22.

What is the inflation formula?

Adjusted amount equals amount multiplied by the end-year index divided by the start-year index.

Can I use this as a forecast?

No. The calculator compares historical index values only. It does not forecast future inflation.

How often should the data be updated?

The BLS CPI-U source is released monthly. This page stores annual averages and should be refreshed when the next BLS annual average is published.