Free inflation calculator
Calculate the inflation-adjusted purchasing power of money over time — enter an amount, start year, and end year using CPI data, updated live, as you type.
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Uses compound inflation formula. Based on US BLS CPI methodology. Actual inflation varies.
Results are estimates. Consult a professional.
How the inflation calculator works
The inflation calculator converts a dollar amount from one year to another using the Consumer Price Index (CPI) — the Bureau of Labor Statistics' monthly survey of prices for a fixed basket of goods and services. It shows how much purchasing power a given sum has gained or lost over time, and what a past or future dollar figure is worth in today's money.
Worked example: $1,000 in 2004 vs. 2024
The CPI-U index stood at roughly 188.9 in 2004 and 309.7 in 2024. Applying the formula shows how much more you would need in 2024 to match the same purchasing power as $1,000 in 2004.
$1,000 purchasing power eroded by inflation
The table shows what $1,000 today is worth after inflation runs at a steady rate. Each cell represents the real value remaining after the stated number of years — money not invested anywhere, just held in cash.
| Years | 2% Inflation | 3% Inflation | 4% Inflation | 5% Inflation |
|---|---|---|---|---|
| 10 years | $820 | $744 | $676 | $614 |
| 20 years | $673 | $554 | $456 | $377 |
| 30 years | $552 | $412 | $308 | $231 |
Source: Present value = $1,000 ÷ (1 + rate)^years. Rounded to nearest dollar.
Tips for understanding your inflation exposure
Inflation affects different people differently depending on what they spend money on. The CPI is an average across a broad basket of goods; your personal inflation rate could be higher or lower depending on housing costs, healthcare needs, and lifestyle.
- Compare salary raises to CPI — a 3% raise in a 4% inflation year is a real pay cut; the calculator shows you the gap in purchasing power terms.
- Use it to set savings targets — if you need $50,000 for a goal in 15 years and inflation runs at 3%, you will actually need about $77,900 in nominal dollars.
- Apply it to retirement planning — a fixed pension or annuity loses real value every year; knowing the cumulative erosion helps you plan supplemental income.
- Distinguish CPI from your personal basket — medical costs, college tuition, and childcare inflate faster than the overall CPI index.
- Look at real returns, not nominal — a savings account earning 1.5% during 3% inflation is losing purchasing power; always subtract inflation from any quoted return.
Accuracy and limitations
The CPI-U measures prices for a fixed basket of goods purchased by urban consumers — about 93% of the U.S. population. It does not capture individual spending patterns, regional price differences, or changes in product quality over time (the substitution and quality-adjustment debates are long-running among economists). Historical conversions are accurate to the CPI data available; projections using a fixed assumed rate are illustrative because future inflation cannot be known in advance.
Not financial advice — consult a financial professional for your specific situation.
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About this calculator
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