Introduction
Our CPI Inflation Calculator shows how the buying power of the U.S. dollar changes over time. Enter any dollar amount, pick a start date and an end date, and the tool will tell you what that money is worth after inflation. It uses official Consumer Price Index (CPI) data from the Bureau of Labor Statistics, which tracks the average price of goods and services across the country.
Inflation means prices go up over time, so a dollar today buys less than it did years ago. This calculator helps you see exactly how much less. You can compare any two periods from 1913 to the present, or even use historical estimates going back to 1900. Results include the total price change, the average yearly inflation rate, and charts that show how prices and purchasing power shifted over your chosen time range.
Use this tool to adjust old salaries for today's prices, see how much your savings have lost to inflation, or understand how the cost of living has changed between any two points in time.
How to Use Our CPI Inflation Calculator
Enter a dollar amount and two dates to see how inflation has changed the value of your money over time. The calculator will show you the adjusted amount, the total price change, and the average yearly inflation rate between your chosen dates.
Dollar Amount: Type the amount of money you want to check. This is the starting value you want to adjust for inflation.
Start Month and Start Year: Pick the month and year your amount is from. You can also choose "Annual Average" to use the full-year average CPI instead of a single month.
End Month and End Year: Pick the month and year you want to convert your amount to. Set this to the current date to see what your money is worth today.
Reverse Mode: Click "Reverse: Find Original Amount" if you know the ending value and want to find out what it would have been worth in an earlier year. This is similar to finding a present value by working backward from a known future amount.
Swap Dates: Click "Swap Dates" to quickly switch your start and end dates with each other.
Use Latest Available Data: Click this button to set the end date to the most recent month of CPI data available.
Calculate: Press the "Calculate" button to see your results. You can also turn on "Auto-calculate on change" to get results instantly each time you change an input.
What Is the CPI Inflation Calculator?
This calculator shows how the buying power of the U.S. dollar changes over time. It uses the Consumer Price Index (CPI) from the Bureau of Labor Statistics to compare prices between two dates. You enter a dollar amount, pick a start date and an end date, and the tool tells you what that money is worth after inflation.
What Is CPI?
The Consumer Price Index (CPI-U) tracks the average price of goods and services that people buy every day. This includes things like food, housing, clothes, gas, and medical care. The U.S. Bureau of Labor Statistics measures these prices each month. When the CPI goes up, it means prices have gone up. That rise in prices is what we call inflation.
What Is Inflation?
Inflation is the rate at which prices increase over time. When inflation goes up, each dollar you have buys less than it did before. For example, something that cost $1.00 in 1990 costs much more today. This loss of purchasing power is why the same amount of money feels like less as years pass.
How the Calculator Works
The calculator divides the CPI value of your end date by the CPI value of your start date. That ratio shows how much prices changed between the two dates. It then multiplies your dollar amount by that ratio to find the new value. The results include the total price change, the average yearly inflation rate, and charts that show how inflation and purchasing power shifted over your chosen time period. The average annual inflation rate is essentially a compound annual growth rate (CAGR) applied to prices rather than investments.
What the Results Mean
- Converted Amount: your dollar amount adjusted for inflation in the end period. Think of it as the future value of your money after accounting for rising prices.
- Cumulative Price Change: the total percentage that prices rose or fell between your two dates.
- Average Annual Inflation Rate: the average rate prices changed per year over your selected range.
- Purchasing Power Chart: a visual that shows how the real value of your money changed over time.
- Inflation by Spending Category: a breakdown showing how inflation hit different areas like food, housing, and medical care at different rates.
Why Inflation Matters
Understanding inflation helps you make better choices with your money. It affects savings, wages, retirement plans, and everyday spending. If your income does not grow as fast as inflation, you can afford less over time. Inflation also erodes the real returns on your investments and the purchasing power of fixed-income accounts like a 401(k) or Roth IRA. Even the interest earned in a compound interest account may not fully offset inflation. Building a solid budget and tracking your net worth over time can help you stay ahead. This calculator gives you a clear picture of how inflation has changed the value of the dollar across any period from 1900 to today.