An inflation calculator converts an amount of money from one year into the amount with the same buying power in another year. It multiplies the amount by the ratio of two Consumer Price Index values. For example, 1,000 dollars in 2000 equals about 1,945.30 dollars in August 2026.
Equivalent amount after inflation
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How to Use the Inflation Calculator
- Pick a mode. Choose US CPI data to compare two past years. Choose your own rate to test a future assumption.
- Enter the amount. Then enter the two years, or the annual rate and the number of years.
- Read the equivalent amount, the total price change and the buying power that is left.
What each result tells you:
| Result | What it means |
|---|---|
| Equivalent amount after inflation | The sum that buys the same basket of goods in the to year. |
| Total price change | The cumulative rise or fall in prices across the whole period. |
| Average annual inflation | The steady yearly rate that produces the same total change. |
| Buying power of the same amount | What the unchanged amount is worth at the end, in start-year dollars. |
| Change in buying power | The percent of buying power lost or gained. |
| CPI in each year | The index values used, so you can check the result yourself. |
You can also go backward. Enter 2026 as the from year and 2000 as the to year. The tool then shows that 1,000 dollars today matches 514.06 dollars in 2000.
What Is Inflation?
Inflation is the increase in the prices of goods and services over time. The Federal Reserve defines it as a general rise in the overall price level, not a rise in one product.
Rising prices reduce buying power. The same 100 dollars buys fewer groceries, less fuel and less rent each year that prices climb. Falling prices are called deflation, and they raise buying power.
The United States measures consumer inflation with the Consumer Price Index, or CPI. The Bureau of Labor Statistics, or BLS, describes the CPI as a measure of the average change over time in the prices paid by consumers for a representative basket of goods and services.
This calculator uses the CPI for All Urban Consumers, called CPI-U. BLS says the CPI-U population covers over 90 percent of the United States population. The series is the US city average for all items, with 1982 to 1984 set to 100.
An inflation calculator helps savers, workers and researchers compare money across time. It does not predict future prices. Our guide on how the CPI is calculated explains why your personal inflation can differ from the national figure.
How Does the Inflation Calculator Work?
The calculator multiplies your amount by the ratio of two price index values. In own rate mode it compounds the rate you enter.
Equivalent amount = amount x (CPI in to year / CPI in from year). Own rate mode: Equivalent amount = amount x (1 + rate) ^ years.- Look up both index values. The tool holds the BLS annual average for each year from 1913 to 2025. For 2026 it uses the August 2026 index of 334.980.
- Divide the later index by the earlier one. The ratio shows how much the price level changed.
- Multiply by your amount. The answer is the sum with equal buying power in the to year.
- Find the total change. Total price change = (ratio - 1) x 100.
- Find the yearly average. Average annual inflation = ratio ^ (1 / years) - 1.
Buying power runs the other way. Buying power = amount x (CPI in from year / CPI in to year). In own rate mode, buying power = amount / (1 + rate) ^ years.
These are the BLS annual averages for recent years, with the change from the year before:
| Year | CPI-U annual average | Change from prior year |
|---|---|---|
| 2021 | 270.970 | 4.7% |
| 2022 | 292.655 | 8.0% |
| 2023 | 304.702 | 4.1% |
| 2024 | 313.689 | 2.9% |
| 2025 | 321.943 | 2.6% |
| 2026 (August) | 334.980 | Latest month, not a full year |
BLS did not publish an index for October 2025 because of a lapse in appropriations. BLS still published the 2025 annual average shown above.
Inflation Calculator Example
A worker earned 50,000 dollars in 2020. What salary gives the same buying power in 2025?
| Step | Calculation | Result |
|---|---|---|
| CPI-U annual average, 2020 | From BLS | 258.811 |
| CPI-U annual average, 2025 | From BLS | 321.943 |
| Ratio | 321.943 / 258.811 | 1.2439 |
| Equivalent amount | 50,000 x 1.2439 | 62,196.54 |
| Total price change | (1.2439 - 1) x 100 | 24.39% |
| Average annual inflation | 1.2439 ^ (1 / 5) - 1 | 4.46% |
| Buying power of 50,000 | 50,000 x 258.811 / 321.943 | 40,195.16 |
Meaning: the worker needs 62,196.54 dollars in 2025 to match 50,000 dollars in 2020. A salary that stayed at 50,000 buys what 40,195.16 dollars bought in 2020. That is a 19.6 percent fall in buying power.
Factors That Change Your Inflation Result
The Years You Compare
Long periods compound. 100 dollars from 1980 equals 406.53 dollars in August 2026. The same 100 dollars from 2020 equals 129.43 dollars.
Annual Average or Single Month
Years up to 2025 use the annual average. The year 2026 uses one month, August, because the year is not complete. A full-year figure for 2026 will differ.
The Price Index
CPI-U is one of several indexes. BLS also publishes CPI-W for wage earners and the Chained CPI. The Federal Reserve targets 2 percent inflation on a different index, the price index for personal consumption expenditures.
Deflation Periods
Prices fell in some periods. 100 dollars in 1929 matched 76.02 dollars in 1933, a price drop of 24.0 percent. The tool shows a negative change in that case.
The Rate You Assume
Small rate changes matter over time. Over 20 years, 10,000 dollars keeps 6,729.71 of buying power at 2 percent and 3,768.89 at 5 percent.
This table shows the buying power of 10,000 dollars under four steady rates. The rates are examples, not forecasts.
| Annual rate | After 10 years | After 20 years | After 30 years |
|---|---|---|---|
| 2% | 8,203.48 | 6,729.71 | 5,520.71 |
| 3% | 7,440.94 | 5,536.76 | 4,119.87 |
| 4% | 6,755.64 | 4,563.87 | 3,083.19 |
| 5% | 6,139.13 | 3,768.89 | 2,313.77 |
CPI Mode vs Own Rate Mode Compared
| Feature | US CPI data mode | Own rate mode |
|---|---|---|
| Question it answers | What did prices actually do between two years? | What happens under a rate I choose? |
| Data used | BLS CPI-U, 1913 to August 2026 | Your rate and number of years |
| Time direction | Past and present only | Any period, including the future |
| Currency | US dollars only | Any currency, shown with a dollar sign |
| Main limit | National average, not your own basket | The rate is an assumption |
What 100 dollars from an earlier year equals in August 2026, from the same BLS series:
| From year | CPI-U annual average | Equivalent in August 2026 | Total price change |
|---|---|---|---|
| 1950 | 24.1 | 1,389.96 | 1290.0% |
| 1970 | 38.8 | 863.35 | 763.4% |
| 1990 | 130.7 | 256.30 | 156.3% |
| 2000 | 172.2 | 194.53 | 94.5% |
| 2010 | 218.056 | 153.62 | 53.6% |
| 2020 | 258.811 | 129.43 | 29.4% |
Use own rate mode for money outside the United States. Enter the inflation rate from your own national statistics office.
When to Use an Inflation Calculator
Checking a Pay Rise
Compare an old salary with a new one in the same dollars. A raise below the total price change is a cut in real terms. See how to calculate a raise percentage for the pay side.
Comparing Old Prices
Convert a past price, such as a house bought in 1990, into current dollars before you compare it with a price today.
Planning a Savings Target
Use own rate mode to see what a future goal costs in future dollars. Then test the plan with the savings goal calculator.
Judging an Investment Return
A return matters after inflation. Find your growth rate with the CAGR calculator, then compare it with average annual inflation for the same years.
Common Inflation Calculation Mistakes
1. Adding Yearly Rates Together
Inflation compounds. Ten years at 3 percent is a 34.4 percent rise, not 30 percent.
2. Mixing Up the Two Amounts
The equivalent amount is the larger sum you need later. Buying power is the smaller value your unchanged money keeps. At 3 percent for 10 years, 10,000 dollars needs to become 13,439.16, and it keeps 7,440.94 of buying power.
3. Treating a Price Rise and a Buying Power Loss as Equal
A 24.4 percent price rise is a 19.6 percent loss of buying power. The two percentages use different bases.
4. Comparing a Month with a Year
The 2026 value is the August index. It is not seasonally adjusted and it is not an annual average.
5. Using US Data for Another Currency
CPI mode measures United States prices. Use own rate mode with a local rate for other countries.
6. Reading the Average as Your Own Inflation
BLS notes that published averages do not always match one household. Your rent, fuel and food mix differs from the national basket.
Accuracy and Limitations
The arithmetic is exact for the index values used. The result is an estimate of average United States consumer prices, not of your personal costs.
What it calculates accurately
- The index ratio between any two years from 1913 to 2025
- The change from any year to August 2026
- Total and average annual price change
- Compound growth at a rate you enter
What it does not account for
- Future inflation, which nobody knows in advance
- Regional price differences inside the United States
- Your own spending mix, such as high rent or medical costs
- Taxes, interest and investment returns
- Later BLS data, which arrive every month
- Prices in other countries or currencies
BLS states that the CPI differs from a complete cost-of-living measure. It excludes investment items such as stocks, bonds and real estate.
How We Calculate the Inflation Adjustment
Frequently Asked Questions About Inflation
How much is 100 dollars from 2000 worth today?
100 dollars from 2000 equals 194.53 dollars in August 2026. The CPI-U rose from 172.2 to 334.980, a total price change of 94.5 percent.
What is the formula for adjusting for inflation?
Multiply the amount by the later price index and divide by the earlier one. With a flat rate, multiply the amount by (1 + rate) raised to the number of years.
What was the average US inflation rate from 2000 to 2026?
The average was about 2.58 percent a year from the 2000 annual average to August 2026. That figure comes from the BLS CPI-U index ratio, not from averaging yearly rates.
Which year had the highest inflation since 2020?
The year 2022 had the largest rise. The CPI-U annual average rose 8.0 percent from 2021 to 2022, then 4.1 percent in 2023 and 2.9 percent in 2024.
What inflation rate should I use for future planning?
No rate is certain, so test several. The Federal Reserve aims for 2 percent inflation over the longer run on its preferred index. Try a low, a middle and a high rate and compare the results.
How much buying power does money lose at 3 percent inflation?
10,000 dollars keeps 7,440.94 of buying power after 10 years at 3 percent. That is a loss of 25.6 percent.
Is CPI-U the same as my cost of living?
No. CPI-U tracks an average basket for urban consumers. BLS says the CPI differs from a complete cost-of-living measure, and one household can see higher or lower price changes.
Can I use this calculator for pounds or euros?
Yes, in own rate mode. Enter the amount, your country inflation rate and the years. CPI mode uses United States data only, so it does not fit other currencies.
Why does 2026 use August instead of a full year?
The year is not finished, so no annual average exists yet. August 2026 was the latest CPI-U month that BLS had published when we read the data on 2026-10-02.
Who should not rely on this calculator?
Anyone making a legal, tax or contract adjustment should use the exact index and month named in the contract. This tool uses annual averages, which differ from single-month values.
Is my data saved?
No. The calculation runs in your browser and nothing is sent to our servers. Anything you Save stays in this browser only.
Sources
- CPI for All Urban Consumers, series CUUR0000SA0 (Bureau of Labor Statistics: index values 1913 to August 2026, read 2026-10-02).
- Consumer Price Index frequently asked questions (Bureau of Labor Statistics: what the CPI measures, CPI-U coverage and limits. The page can block automated checks).
- What is inflation, and how does the Federal Reserve evaluate changes in the rate of inflation? (Board of Governors of the Federal Reserve System).
- Why does the Federal Reserve aim for inflation of 2 percent over the longer run? (Board of Governors of the Federal Reserve System).
- Inflation calculator method note (Federal Reserve Bank of Minneapolis: use of the CPI for dollar comparisons).
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Explore all finance calculatorsThis inflation calculator gives an estimate for education and planning. It is not financial advice. CPI mode uses United States CPI-U figures that the Bureau of Labor Statistics published, read on 2026-10-02. Your own costs can rise faster or slower than the national average. Confirm important decisions with a qualified professional. Spotted an error? Let us know.
Author
Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.
