Inflation Calculator: US Dollar Value and Purchasing Power
Our inflation calculator shows what a US dollar amount from one year is worth in another, using official CPI data from 1913 to 2026. It also projects future costs and the loss of purchasing power at any rate you choose. Pick a mode, enter an amount and see the result.
What Inflation Means
Inflation is the general rise in prices over time. When prices go up, each dollar buys a little less than it did before. A coffee that cost $1 decades ago now costs several times as much, even though the coffee itself has barely changed.
Economists track this with price indexes that follow a fixed basket of goods and services. In the US, the main measure is the consumer price index from the Bureau of Labor Statistics. Our inflation calculator uses that index to compare any two years since 1913.
How to Use the Inflation Calculator
- US dollar value between two years: enter an amount and pick the two years.
- Future cost: enter today's price, a yearly rate and a number of years.
- Future buying power: enter a sum of money, a rate and a number of years.
- Inflation rate from two prices: enter an old price, a new price and the years between them.
Every mode updates as you type. The CPI mode also shows the total price change, the average yearly rate and the index values it used. That way you can check the math against the official tables.
How the CPI Comparison Works
The tool divides the CPI of the later year by the CPI of the earlier year and multiplies your amount by the result. The CPI averaged 172.2 in 2000 and 321.943 in 2025. So $100 in 2000 equals about $186.96 in 2025, which means prices rose by 86.96% over those 25 years.
The same math works backward. Pick a later year first and the inflation calculator shows what a modern amount would have been worth in the past. That is handy for reading old prices, wages or rents in today's terms.
About the Data
The figures are annual averages of the CPI for all urban consumers, the series most people mean when they say CPI. They come from the Bureau of Labor Statistics through the Federal Reserve Bank of St. Louis. The 2026 value averages January to August, so it will change as new months arrive.
There is one gap worth knowing about. The October 2025 index was never published because of the federal government shutdown, so the 2025 average uses the other 11 months. The difference this makes to any result is very small.
What Causes Inflation
Prices rise for a few main reasons. Demand pull inflation happens when people and firms want to buy more than the economy can produce. Cost push inflation happens when wages, energy or raw materials get more expensive and firms pass the cost on to buyers.
The money supply plays a part too, since more money chasing the same goods tends to lift prices. Expectations matter as well, because workers ask for bigger raises and firms set higher prices when they expect inflation to continue. Central banks such as the Federal Reserve raise interest rates to slow this cycle, with a target of about 2% a year.
Purchasing Power Explained
Purchasing power is what a fixed amount of money can buy. As prices rise, the purchasing power of each dollar falls. One dollar from 2000 buys only about 53 cents worth of goods in 2025.
This matters most for anything paid in fixed dollars. Cash savings, fixed pensions and long term contracts all lose purchasing power when prices climb. Wages that rise slower than inflation cut purchasing power the same way, even when the number on the paycheck goes up.
How to Calculate Inflation
To work out inflation between two dates, divide the new price or index by the old one, subtract 1 and multiply by 100. If a basket cost $250 last year and $260 this year, inflation was 4%. The same steps work for a single product or the whole economy.
Average Yearly Rate
For longer periods, the average yearly rate is more useful than the total change. It uses a root rather than a simple division, because prices compound. Prices that went from $2.50 to $4.00 over 10 years rose 60% in total, but only 4.81% a year on average.
Dividing 60% by 10 would give 6%, which overstates the true rate. Our inflation rate mode does the correct root math for you. The CPI mode shows the same average for any pair of years.
Future Cost and Buying Power
The future cost mode shows how much something may cost later if prices keep rising at a steady rate. At 3% a year, an item that costs $1,000 today would cost about $1,343.92 in 10 years. At 6%, the same item would cost $1,790.85.
The buying power mode answers the reverse question. At 3% a year, $1,000 kept in cash would buy only about $744.09 worth of today's goods after 10 years. That loss of purchasing power is easy to miss because the number in the account never changes. Use this mode to see what a fixed pension or a savings goal will really be worth.
The Rule of 72
A quick way to estimate how fast prices double is the rule of 72. Divide 72 by the yearly rate to get the number of years. At 3% inflation, prices double in about 24 years, close to the exact answer of 23.4 that the tool gives.
US Inflation Through the Decades
US prices have risen in most years since 1913, but the pace has varied a lot. The table below shows what $100 from earlier years was worth in 2025 dollars. Each row uses the same CPI data as the tool above.
| From year | $100 then in 2025 dollars |
| 1970 | $829.22 |
| 1980 | $390.67 |
| 1990 | $246.40 |
| 2000 | $186.96 |
| 2020 | $124.39 |
The 1970s and early 1980s saw the fastest rises, with yearly inflation above 10% at times. Prices from 1990 to 2025 grew about 2.61% a year on average. The jump in 2022, when the yearly average rose 8%, was the largest in four decades.
Planning a Budget With Inflation
Inflation matters most over long periods, such as saving for retirement or a child's education. Say you need $50,000 a year to live today and prices rise 3% a year. The inflation calculator shows you would need about $90,306 a year in 20 years to keep the same lifestyle.
The buying power mode shows the other side of the same problem. A fixed $50,000 received in 20 years would have the purchasing power of only about $27,684 today. Running both numbers before you set a savings target gives a far more realistic plan.
Build a margin into any long term goal, because no one knows future rates for sure. Many planners test their numbers at 2%, 3% and 4% to see a range of outcomes. The inflation calculator makes that kind of check quick, since you only change one box.
Ways to Protect Your Money
- Treasury Inflation Protected Securities (TIPS), whose principal adjusts with the CPI.
- Series I savings bonds, which pay a rate tied partly to inflation.
- Stocks and real estate, which have tended to beat inflation over long periods but carry more risk.
- Regular pay reviews, so your income keeps its purchasing power.
None of these is risk free, and the right mix depends on your goals and time frame. Speak to a licensed financial adviser before you make a large decision. The inflation calculator helps you size the problem, not choose the product.
Returns After Inflation
Your real return is what you earn after inflation. If a savings account pays 4% and inflation runs at 3%, you gain only about 1% a year. When inflation beats the interest rate, your savings lose purchasing power even as the balance grows.
The exact figure divides 1.04 by 1.03 and subtracts 1, which gives 0.97%. Compare this with the results of our Compound Interest Calculator to see how much your money really grows. Long term investors usually aim for a return well above the inflation rate.
Cost of Living and Wages
Many employers and governments adjust pay or benefits each year to match inflation. In the US, Social Security payments rise each year with a cost of living adjustment based on a CPI measure. Comparing your raise with the CPI change shows whether your pay really went up.
Say you earned $50,000 in 2020 and $60,000 in 2025. The inflation calculator puts $50,000 from 2020 at $62,196.55 in 2025 money, so the raise did not keep up. You would need about $2,197 more to match your 2020 purchasing power.
When Prices Fall: Deflation
Deflation is the opposite of inflation, a general fall in prices. It sounds good, but it often comes with falling wages, weak demand and job losses. Pick 1929 and 1933 in the inflation calculator and you will see US prices fell by about 24.6% during the Great Depression.
In a deflation, the purchasing power of cash rises while debts become harder to repay. Central banks try to avoid it as much as they try to avoid high inflation. That is one reason most of them aim for a small positive rate rather than zero.
Limits of Any Inflation Figure
- The CPI tracks an average basket, so your own costs may rise faster or slower.
- Rent, health care and education have often outpaced the overall index.
- Results for other countries need their own local price data.
Use the CPI result as a guide rather than a precise figure for your household. If you live outside the US, use your national statistics office's rate with the rate modes of this tool. The future cost and buying power modes work with any currency.
Why Use Our Inflation Calculator
It combines official US CPI history with simple tools for future costs, buying power and price changes. Every result shows the formula and the numbers behind it. It runs in your browser and nothing you type is stored. Pick a mode and check your numbers now.
Frequently asked questions
Is this inflation calculator free?
Yes, it is free with no sign up and no limit.
Where does the CPI data come from?
It is the consumer price index for all urban consumers, published by the Bureau of Labor Statistics.
How to calculate inflation between two years?
Divide the later CPI by the earlier CPI, subtract 1 and multiply by 100.
What is a real return on savings?
It is roughly your interest rate minus the inflation rate.
How accurate is the inflation calculator?
It uses official CPI averages, so results match the government data to within rounding.
Why is 2026 marked as a partial year?
Its CPI averages only the months published so far.
Does inflation always reduce purchasing power?
Yes, unless your income or savings grow at least as fast as prices.
Can I use the inflation calculator for other countries?
Yes, the rate modes work with any currency and any local inflation rate.
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