Inflation Calculator

Inflation is the silent unit-conversion problem in every money conversation: a 1980 salary, a 2000 house price and a 2026 grocery bill are quoted in three different currencies that happen to share a name. This calculator converts between them — historically using actual US Consumer Price Index data, and forward using any inflation assumption you choose.

How Inflation Adjustment Works

The Bureau of Labor Statistics tracks the price of a representative basket of goods as the CPI-U index. Converting money between years is a ratio of index values:

Example: $100 in 2000 (CPI 172.2) is equivalent to about $190 in 2026 (CPI ≈ 328) — cumulative inflation of roughly 90%. Anything that grew less than 90% over that span got cheaper in real terms; anything that grew more got dearer.

What $100 From the Past Is Worth Today

The 2020–2023 stretch stands out: about 19% cumulative inflation in three years, the fastest US episode since the early 1980s — which is why so many salary and budget conversations still feel "off" against pre-2020 anchors.

The Future Side: Why 3% Matters to Your Savings

Small rates compound into large erosion. At 3% inflation, money loses half its purchasing power roughly every 24 years (the Rule of 72 in reverse):

This is the strongest argument for investing rather than holding cash long-term: an account yielding less than inflation is losing money in the only units that matter — what it buys. Retirement planning should always be done in real (inflation-adjusted) dollars, which is why our retirement tools expose the inflation assumption explicitly.

How to Use the Inflation Calculator

1. Historical: enter an amount and two years — the tool converts using the CPI ratio and shows cumulative inflation between them.
2. Future: enter today's amount, a horizon and an assumed rate — read both what your money will buy then, and how much you'd need then to match today's buying power.
3. Stress-test the future numbers at 2% and 4% — the truth will land between the Fed's target and the historical average more often than not.

Frequently Asked Questions

Where does the historical data come from?

US CPI-U annual averages published by the Bureau of Labor Statistics, with the most recent year an estimate pending final data. Milestone years before 2010 are included for long-range comparisons.

Why does my result differ slightly from the BLS calculator?

The official calculator uses monthly index values; this tool uses annual averages, so figures can differ by a percent or two. For year-to-year comparisons that difference rarely changes any conclusion.

What inflation rate should I assume for the future?

The Federal Reserve targets 2%; the US long-run average since 1926 is nearer 3%. Planning conservatively at 3% — and checking 4% — gives an honest range.

Does CPI reflect my personal inflation?

Only approximately. CPI weights a national average basket; if your spending skews toward housing, healthcare or education, your personal rate has likely run higher than headline CPI.

Is deflation possible?

Yes, though rare in the US (1930s, briefly 2009). The forward calculator accepts 0% but not negative rates, since sustained deflation isn't a realistic planning baseline.

Is my data private?

Yes — the CPI table is built into the page and every calculation runs locally in your browser.

How do I inflation-adjust my salary history?

Use the companion Inflation-Adjusted Salary tool, which walks a wage across years and shows whether raises beat rising prices.

Once you see prices as unit conversions, a lot of money noise quiets down: you can compare your salary to your parents', judge whether a raise was real, and plan retirement in dollars that will still mean something. Bookmark it for the next time someone quotes a 1985 price at you.