Calculate US historical inflation from 1913 to 2026 using official CPI-U monthly data, or project custom flat-rate inflation effects.
Understanding Global & U.S. Inflation
Inflation is a general increase in the prices of goods and services over time, which effectively reduces the purchasing power of your money. What you could buy with a specific amount of money yesterday will cost more tomorrow.
How We Measure Inflation
- U.S. Data: Sourced directly from the U.S. Bureau of Labor Statistics (BLS). It uses the Consumer Price Index for All Urban Consumers (CPI-U), which tracks the average change in prices paid by urban consumers for a market basket of consumer goods. This data is highly granular, providing month-by-month changes going all the way back to 1913.
- International Data: Sourced from the World Bank. Global CPI data is aggregated annually (year-over-year) and standardized with a baseline year to allow accurate purchasing power comparison across decades. Available data generally spans from 1960 to the last complete calendar year.
United States Inflation Context
In the United States, inflation is primarily tracked by the Bureau of Labor Statistics (BLS) using the Consumer Price Index (CPI-U). The Federal Reserve targets a long-term inflation rate of around 2% to ensure maximum employment and price stability. Major historical inflationary periods include the post-WWII era and the 1970s "Great Inflation".
U.S. Historical Highlights
| Year | Annual Avg CPI | Equivalent Buying Power (of $100.00 in 1913) |
|---|---|---|
| 1913 | 9.900 | $100.00 |
| 1930 | 16.700 | $168.69 |
| 1950 | 24.100 | $243.43 |
| 1970 | 38.800 | $391.92 |
| 1990 | 130.700 | $1,320.20 |
| 2010 | 218.056 | $2,202.59 |
| 2020 | 258.811 | $2,614.25 |
| 2025 | 322.257 | $3,255.12 |
Flat Rate Projection vs CPI
While CPI uses actual historical measurements to tell you what happened in the past, Flat Rate calculators are ideal for long-term financial planning. Using a projected inflation rate (such as a central bank's target rate of 2-3%), you can accurately forecast how much money will be needed in the future to maintain your current standard of living.
The Rule of 72
A quick way to estimate the impact of inflation is the "Rule of 72." If you divide 72 by the annual inflation rate, you get the approximate number of years it will take for prices to double (and your money's purchasing power to be cut in half). For example, at a 3% inflation rate, prices will double every 24 years (72 ÷ 3 = 24).
How it Works & Formula
To find the adjusted buying power, the starting dollar amount is multiplied by the ratio of the ending Consumer Price Index to the starting Consumer Price Index.
Practical Examples
Comparing buying power of $100 in January 1913 to today shows the impact of over a century of inflation. The CPI index rose from around 9.8 to over 330, meaning $100 in 1913 is equivalent to over $3,300 today.
With an average inflation rate of 3% per year (the target/historical norm for many central banks), a savings account balance of $10,000 will require $13,439 in 10 years to maintain the same purchasing power.
Frequently Asked Questions
How does this US CPI Inflation Calculator work?
It compares the purchasing power of the US Dollar across years and months using the Consumer Price Index (CPI-U) dataset compiled by the US Bureau of Labor Statistics (BLS). It divides the target year's CPI by the source year's CPI and multiplies by your starting amount.
What is CPI-U?
CPI-U stands for the Consumer Price Index for All Urban Consumers. It represents about 93% of the total US population and measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.
What is the difference between CPI-U and flat rate inflation calculations?
CPI-U utilizes actual historical inflation data recorded in the United States since 1913. Flat rate inflation calculations apply a constant compound rate of inflation over a specified period to project hypothetical future values (Forward) or calculate past values (Backward).
Why does the year 2026 have limited months?
The calculator uses actual published monthly data from the BLS. For the year 2026, months after April have not yet been published by the government, so they are excluded. The Annual Average option is also unavailable for 2026 until the full year is complete.