How the Inflation Calculator Works
This inflation calculator uses the Consumer Price Index (CPI) to show how the purchasing power of money changes over time. The CPI measures the average change in prices paid by urban consumers for a market basket of goods and services. By comparing the CPI of two different years, we can calculate the equivalent value of a dollar amount.
What is inflation?
Inflation is the rate at which the general level of prices for goods and services rises, eroding the purchasing power of currency. A dollar today buys less than a dollar did ten years ago. That’s why $1,000 in 1990 is equivalent to about $2,400 in 2024.
How to use the calculator
- Enter an amount – the dollar value you want to convert (e.g., 500).
- Select a start year – the year for the original amount.
- Select an end year – the year you want to compare to (often the latest available).
- Click Calculate inflation to see the equivalent value, total inflation rate, and average yearly change.
Understanding the results
The calculator shows the equivalent amount you would need in the end year to have the same purchasing power as the original amount in the start year. It also displays:
- Cumulative inflation – the total percentage increase in prices over the period.
- Average yearly inflation rate – the constant annual rate that would produce the same total change.
What data is used?
The tool is powered by official Consumer Price Index for All Urban Consumers (CPI-U) data from the U.S. Bureau of Labor Statistics. We use annual average index values from 1913 to 2024 (latest available). The CPI is the most widely followed inflation gauge in the United States.
Why inflation matters
Whether you’re budgeting, investing, or comparing historical salaries, understanding inflation helps you make better financial decisions. A salary of $50,000 in 2000 is not the same as $50,000 today – it’s actually worth around $90,000 in 2024 dollars. Use this calculator to put numbers into perspective.
