π Inflation Calculator
What was a dollar worth back then, and what will it buy in the years ahead?
Inflation-Adjusted Value
Estimates for planning only, not financial advice.
How to Use This Calculator
Enter any dollar amount, pick a start year and an end year, and choose your inflation source. The Historical CPI option uses real Bureau of Labor Statistics CPI-U annual averages from 1990 through 2025, so you can see what $10,000 in 2000 is worth today. The Custom annual rate option lets you project forward with any rate you choose, which is handy for retirement planning and cost projections.
Enter the Dollar Amount you want to adjust. This can be a past salary, an old home price, a future college bill, or anything you want to compare across time.
Choose the Start Year and End Year. To look backward, make the start year earlier. To project forward, set the start year to today and the end year to a future year.
Pick the Inflation Source. Historical CPI uses real BLS data. Custom annual rate lets you enter your own rate, which is useful for projecting costs like tuition that rise faster than average inflation.
Read the three results: the inflation-adjusted value, the cumulative inflation percentage over the whole period, and the average annual rate. Together they tell you how much purchasing power was gained or lost.
What the CPI Actually Measures
The Consumer Price Index is built from roughly 80,000 prices collected each month across the country: groceries, rent, clothing, medical visits, gas, cars, restaurant meals, and hundreds of other items. The BLS weights each item by how much of a typical urban household budget it consumes, so housing (about a third of the index) moves the CPI far more than, say, apparel. The result is a single number that answers one question: how much more or less does the same basket of stuff cost than it used to?
The CPI-U annual averages in this calculator run from 1990 (130.7) through 2025 (320.0, projected). That means the broad price level is about two and a half times higher than it was in 1990. Two features of the data stand out. First, the 2008 to 2009 stretch shows the only deflation year in the series: the index fell from 215.3 to 214.5 as the financial crisis crushed demand. Second, the 2021 to 2023 spike is the steepest three-year climb in the series: 258.8 to 304.7, a jump that put inflation on every dinner-table conversation for the first time in a generation.
Purchasing Power: The Number That Matters
Purchasing power is the flip side of price levels. If the CPI doubles between two years, every dollar buys half as much. The relationship is simple division: a basket that cost $172.20 in 2000 costs $320.00 in 2025, so $100 from the year 2000 has the buying power of about $185.87 today. Nothing about the dollars changed, only what they fetch.
This is why nominal amounts mislead over long periods. A $50,000 salary in 2000 sounds modest next to a $100,000 salary in 2025, but in 2000 dollars the second salary is worth about $53,875, barely ahead after 25 years of inflation. Any comparison that crosses more than a few years should be inflation-adjusted first, or it is comparing apples to oranges.
Worked Example
A house bought in 2000 for $150,000. CPI 2000 = 172.2, CPI 2025 = 320.0. Adjusted value = 150,000 x (320.0 / 172.2) = $278,748. Cumulative inflation = (320.0 / 172.2 - 1) x 100 = 85.8 percent. Average annual rate = (320.0 / 172.2)^(1/25) - 1 = 2.51 percent. So if the house sold for less than about $278,750 in 2025, its real value actually fell even though the price tag nearly doubled. Run the same math forward: at a custom 3 percent rate, $100,000 of spending power today needs $134,392 in ten years just to stand still.
Why Inflation Matters for Savers and Retirees
Inflation is the quiet tax on idle money. A savings account earning 1 percent while inflation runs 3 percent loses 2 percent of purchasing power every year, which compounds to a 33 percent loss over 20 years. Retirement plans feel this the hardest: a fixed $60,000 a year pension buys what only about $33,000 buys today after 20 years at 3 percent inflation. That is why financial planners insist that long-term money be invested rather than saved, and why they inflate future spending goals before deciding how much to save. Use this calculator to inflate your own target: put your hoped-for annual spending in as the amount, today as the start year, your retirement year as the end year, and a 3 percent custom rate, and you will see the real number you are saving toward.
Estimates for planning only, not financial advice. CPI values are annual averages, approximated from BLS data.
Frequently Asked Questions
What is the CPI?
The Consumer Price Index (CPI) is the Bureau of Labor Statistics' main measure of US inflation. It tracks the price of a fixed basket of goods and services, from groceries and rent to medical care and transportation, and reports how much that basket costs over time. The CPI-U (all urban consumers) covers about 93 percent of the US population and is the standard reference for inflation adjustments.
How does this calculator adjust for inflation?
It compares the CPI-U annual average for your start year and your end year. Your amount is multiplied by the ratio of the two index values, so $100 in 2000 becomes $100 x (CPI 2025 / CPI 2000). The cumulative percentage change and the average annual inflation rate over the period are calculated from the same two index values.
What does "purchasing power" mean?
Purchasing power is what your money can actually buy. When inflation runs at 3 percent a year, a dollar buys about 3 percent less stuff each year. Over 20 years at 3 percent, prices roughly double, so $100 today buys what $200 buys two decades from now. This calculator shows that erosion in concrete dollar terms.
Why use a custom inflation rate instead of CPI?
The CPI measures average prices across the whole economy, but your personal inflation can differ. Housing, college tuition, and healthcare have historically risen faster than the overall CPI, while electronics have gotten cheaper. If you are planning for a specific cost, like tuition or retirement spending, a custom rate lets you model that cost's own inflation instead of the national average.
Does this account for deflation?
Yes. If prices fell between your start and end years, for example 2009 when the CPI dipped during the financial crisis, the calculator will show a negative cumulative change and a lower adjusted value. Deflation is rare in the US, but the math works in both directions.
Is past inflation a good guide for future prices?
It is a starting point, not a promise. The last 30 years averaged roughly 2.6 percent annual inflation, but the 1970s ran above 7 percent and 2021 to 2023 spiked above 8 percent before cooling. Financial planners commonly stress-test with 3 percent and sometimes with 4 or 5 percent to see how a plan holds up under worse inflation.