Inflation Calculator
Understanding how inflation erodes purchasing power is essential for financial planning, salary negotiations, and historical comparisons. This calculator uses official US Consumer Price Index (CPI-U) data published by the Bureau of Labor Statistics, spanning from 1913 to 2025 — over a century of price changes. Simply enter a dollar amount and select two years to instantly see what that money would be worth in today's dollars, or compare the relative purchasing power between any two time periods. Whether you are calculating how much a historical salary would be worth today, adjusting old contract values for inflation, or planning long-term investments that need to outpace rising prices, this tool gives you precise, data-backed answers in seconds.
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When should you use it?
- check_circle Adjusting a historical home purchase price to understand its equivalent cost in today's market
- check_circle Comparing salary offers across different years to ensure real wage growth after inflation
- check_circle Calculating the real return on long-term investments after accounting for purchasing power erosion
- check_circle Helping students and researchers convert historical financial data to constant dollars for academic papers
- check_circle Planning retirement savings by understanding how much future dollars will actually be worth
- check_circle Settling debates about whether goods and services were really cheaper in the past once inflation is factored in
How it works
The calculator works by comparing the Consumer Price Index (CPI-U) values for your two selected years. The CPI is a measure of the average change in prices paid by urban consumers for a market basket of goods and services — including food, housing, transportation, medical care, and recreation. The Bureau of Labor Statistics surveys thousands of prices monthly and publishes annual averages.
To calculate the equivalent value, the tool divides the CPI of the target year by the CPI of the starting year, then multiplies by your dollar amount. For example, if the CPI was 100 in Year A and 150 in Year B, then $100 in Year A has the equivalent purchasing power of $150 in Year B — meaning prices rose 50% over that period.
The cumulative inflation rate, average annual inflation rate, and purchasing power multiplier are all derived from the same CPI ratio. These figures help you understand not just how much prices changed in total, but how quickly they changed on a year-over-year basis.
Frequently Asked Questions
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How to use
Enter an amount and two years to see how inflation has changed its purchasing power.
Uses official US CPI data from 1913–2025.
- check_circle Bureau of Labor Statistics data
- check_circle Compare purchasing power across years
- check_circle Cumulative inflation percentage