What CPI data is used?

The calculator uses U.S. Bureau of Labor Statistics annual average CPI data from 1913 through 2025, hardcoded for instant, offline calculations.

What does the result mean?

If $100 in 1950 equals $1,200 today, that means you need $1,200 today to buy what $100 bought in 1950 — equivalent purchasing power.

What is cumulative inflation?

Cumulative inflation is the total percentage increase in prices from the start year to the end year. For example, 1,100% means prices grew 12x.

Can I calculate backwards (future to past)?

Yes, simply set the start year after the end year. The tool shows how much less a future dollar amount was worth in the past.

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Inflation Calculator

Calculate purchasing power and inflation impact using historical CPI data from 1913–2025.

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このツールについて

Understand how inflation affects the value of money over time. Enter an amount, choose a start year and end year (1913–2025), and instantly see the inflation-adjusted value using built-in U.S. Consumer Price Index (CPI) data. View total cumulative inflation percentage, how much purchasing power has changed, and a year-by-year table showing the value of $1 from your start year forward. All calculations use official annual CPI averages — no API calls required.

使い方

1 Enter the dollar amount you want to adjust.
2 Select a start year (the year your amount is from).
3 Select an end year (the year to adjust to).
4 Click Calculate to see the adjusted value and total inflation percentage.
5 Scroll down to see the year-by-year value of $1 table.

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