Inflation Calculator

What inflation does to a dollar

A dollar does not stay a dollar. The purchasing power of US money has fallen in almost every year since 1913, and the cumulative effect over a lifetime is startling: a dollar from 1913 buys about as much as $32.52 buys today. That is not a prediction or a projection, it is arithmetic on the consumer price index, which the Bureau of Labor Statistics has published continuously since the early 1920s.

The idea behind an inflation calculator is simple. Pick two years. Look up the consumer price index for each. Divide the later one by the earlier one. Multiply your amount by that ratio. The result is what the same amount of money would have to be in the later year to buy what it bought in the earlier year.

What makes it useful is that it turns vague statements into checkable ones. "Everything costs twice what it did when I was a kid" becomes a specific claim you can test. "My raise kept up with inflation" becomes a comparison of two percentages. And "I'll need X in retirement" becomes a number with a derivation behind it rather than a guess.

This calculator uses annual average CPI-U figures, the same series the Bureau of Labor Statistics publishes and the Federal Reserve Bank of Minneapolis republishes in its historical CPI table from 1913. The index base is the 1982 to 1984 average set to 100, which is why the numbers look small in the early years, 9.9 in 1913 means the 1913 price level was about a tenth of the 1982-84 average.

Worked example: $100 in 1990 to 2025

Put $100 in the amount field, set the starting year to 1990 and the ending year to 2025. Here is the arithmetic the calculator runs.

• CPI in 1990: 130.7
• CPI in 2025: 321.9
• Ratio: 321.9 / 130.7 = 2.463
• Adjusted amount: $100 x 2.463 = $246.29

So $100 in 1990 has the same buying power as $246.29 in 2025. Cumulative inflation over the 35 years was 146.3%, and the average annual rate was 2.61%, close to the long-run target, but not evenly spread. Most of that 146% came in a handful of bad years: 2021 at 4.7%, 2022 at 8.0% and 2023 at 4.1% together account for roughly a third of the entire 35-year increase.

Run it the other way and the same ratio does something useful. $246.29 in 2025 is worth $100 in 1990 dollars, which means $100 in 2025 buys what $40.60 bought in 1990. That is the number to reach for when someone says a 1990 paycheck went further, it did, by a factor of about 2.5.

A second example with a rounder start: $20 in 1980. The index went from 82.4 to 321.9, a factor of 3.91, so $20 in 1980 is $78.13 in 2025 dollars. The 1980s opened with double-digit inflation, which is why that decade looks expensive in hindsight even though the 1990s were calm.

Worked example: a $50,000 salary that did not keep up

Inflation math matters most when it is applied to income, because a salary that stays flat is a pay cut. Suppose you earned $50,000 in 2015 and earn $58,000 in 2025. Did you get ahead?

• CPI in 2015: 237.0. CPI in 2025: 321.9. Ratio: 1.358
• Inflation-adjusted 2015 salary in 2025 dollars: $50,000 x 1.358 = $67,911
• Your actual 2025 salary: $58,000
• Shortfall: $67,911 − $58,000 = $9,911, or about 14.6% behind

The nominal raise of 16% looks respectable until it meets a 35.8% cumulative price increase. In real terms, the $58,000 salary buys about what $42,715 bought in 2015, a 14.6% cut in purchasing power over ten years.

Now a case where income outran prices. $30,000 in 2019 is worth $37,767 in 2025 dollars, because the index went from 255.7 to 321.9, a 25.9% increase. A worker whose pay went from $30,000 in 2019 to $42,000 in 2025 is genuinely ahead by about 11% in real terms. Same method, opposite conclusion, which is the point. Inflation math does not tell you whether you are winning, it tells you what the comparison should be.

One caveat before you apply this to your own pay: the CPI measures a national average basket, and your basket is not average. If you rent in a fast-growing city or pay for child care, your personal inflation rate has almost certainly run above the national figure since 2020.

The formula, and the index behind it

Everything the calculator does comes from one line:

Later amount = Earlier amount x (Later CPI / Earlier CPI)

To get the average annual rate over the period, take the ratio, raise it to the power of 1 divided by the number of years, and subtract 1. For 1990 to 2025: (321.9 / 130.7) ^ (1/35) − 1 = 0.0261, or 2.61% a year. That is a compound average, not the actual rate in any single year, the real path was 5.4% in 1990, 1.6% in 2001, 0.1% in 2015 and 8.0% in 2022.

Here are the index values for a spread of years, so you can see the shape of it.

Two things to notice. First, the compounding: $100 in 1913 is $3,252 in 2025, but almost half of that growth came after 1980. Second, the flatness of the 2010s, prices rose only 9.2% between 2015 and 2020, an average of 1.8% a year, and then 24.4% in the five years after. Anyone who built a budget on the 2010s experience got a nasty surprise.

What the CPI does not capture

The consumer price index is a good general measure and a poor personal one. It tracks the price of a weighted basket of goods and services bought by urban households, with weights updated periodically. That basket includes things you may never buy and underweights things you buy constantly.

Housing. The index uses owners' equivalent rent, an estimate of what a homeowner would pay to rent their own home, rather than house prices or mortgage payments. In a period when home prices and mortgage rates both jump, the CPI can understate the squeeze on a first-time buyer.

Regional differences. The national index blends San Francisco and rural Ohio. The BLS publishes separate indexes for major metro areas, and they diverge meaningfully, a coastal city's cost of living has generally risen faster than the national average.

Quality and substitution. If a product gets better, the index adjusts for the improvement rather than treating the higher price as pure inflation. If beef gets expensive and shoppers switch to chicken, the index assumes substitution. Both adjustments are reasonable in aggregate and can feel wrong in your own grocery cart.

Income and taxes. The CPI says nothing about wages, and it says nothing about tax. Some parts of the tax code are indexed to inflation, brackets, the standard deduction and many credits, while others are not, which means inflation can push you into a higher bracket without any real increase in income. That effect is called bracket creep. The IRS's annual inflation adjustment announcement lists the figures for the current year, and anything involving your own return is a question for a tax professional rather than a calculator.

Using inflation numbers well

Three habits make inflation math more useful. Compare like with like. A price from 1974 and a price from 2025 are not comparable at face value, but a 1974 price adjusted to 2025 dollars and a 2025 price are. Do the adjustment before you form an opinion, not after.

Use the average rate for planning, not the recent one. If you are projecting 20 years ahead, using the last three years of inflation will overstate things badly, and using the calmest decade will understate them. The 1914 to 2025 average of about 3.2% is a reasonable planning figure, and 2.5% to 3% is the range most financial plans use. Recent rates are for understanding what just happened, not for projecting what comes next.

Be careful with "adjusted for inflation" claims. A headline that says wages rose 4% while inflation ran 3% is describing an average, and the average worker does not exist. Industry, region, seniority and hours all shift the answer. The same caution applies to rent, grocery bills and tuition, a national index is a starting point for the comparison, not the answer to your specific question.

Finally, remember what the tool cannot do. It converts between years using a national price index. It does not predict future inflation, it does not tell you what to do with your money, and it does not account for your taxes or your personal spending mix. For the underlying data and methodology, the BLS CPI program pages are the primary source; for a quick cross-check, the Minneapolis Fed's calculator uses the same annual averages this tool does.

This calculator gives a general estimate based on published national averages. It is not investment, financial or tax advice, and it does not take your personal circumstances or tax situation into account.