Last updated: March 2026
What is an Inflation Calculator?
An inflation calculator converts dollar amounts between different years by accounting for changes in purchasing power. When someone says "a movie ticket used to cost a quarter," an inflation calculator quantifies exactly how that compares to today's prices. It answers the fundamental question: what is this amount of money really worth?
This calculator uses the Consumer Price Index for All Urban Consumers (CPI-U), published monthly by the Bureau of Labor Statistics. The CPI tracks prices of a representative basket of goods and services — food, housing, transportation, medical care, and more — to measure the average change in prices over time.
How Inflation is Measured (CPI)
The CPI uses a base period of 1982-1984, where the index equals 100. A CPI of 326.4 in 2026 means that what cost $100 in 1982-84 now costs $326.40 — a 226% increase. The formula for adjusting dollars is straightforward: multiply the original amount by the ratio of the end-year CPI to the start-year CPI.
It's worth noting that CPI has limitations. It measures an average urban consumer's experience and may not match your personal inflation rate. Healthcare costs have risen much faster than the general CPI, while electronics and technology costs have dropped dramatically. Your actual cost of living depends heavily on where you live and what you spend money on.
Historical Inflation Rates in the US
Since 1913, the U.S. dollar has lost roughly 97% of its purchasing power, with an average annual inflation rate of about 3.2%. But that average masks enormous variation. The highest annual rate was 23.7% in 1920, while actual deflation occurred during the Great Depression (prices fell 10.3% in 1932).
The 1970s brought "stagflation" — high inflation combined with economic stagnation. Inflation peaked at 13.5% in 1980 before Federal Reserve Chair Paul Volcker raised interest rates aggressively, triggering a recession but taming inflation. The period from 1990 to 2020 was remarkably stable, with inflation generally between 1.5% and 3.5%. The COVID-era spike to 8% in 2022 was a sharp reminder that inflation can surge unexpectedly.
How Inflation Affects Your Savings
Inflation is often called the "silent tax" because it steadily erodes the value of cash savings without anyone writing a check. At 3% annual inflation, $100,000 in cash loses half its buying power in about 24 years. This is why financial advisors stress the importance of investing in assets that outpace inflation.
To protect against inflation, consider investments with historically positive real returns: stocks (averaging 7% above inflation), real estate, Treasury Inflation-Protected Securities (TIPS), and I Bonds. The key insight is that not investing is itself a risky decision — you are guaranteed to lose purchasing power if your money doesn't grow faster than inflation.
Frequently Asked Questions
What is an Inflation Calculator?
An inflation calculator adjusts dollar amounts for changes in purchasing power over time. It uses the Consumer Price Index (CPI) published by the Bureau of Labor Statistics to show what a given amount of money in one year would be equivalent to in another year. This lets you make apples-to-apples comparisons of prices, salaries, and costs across different time periods.
How is inflation measured in the United States?
The U.S. Bureau of Labor Statistics measures inflation primarily through the Consumer Price Index for All Urban Consumers (CPI-U). The CPI tracks the average price change over time for a basket of goods and services including food, housing, transportation, medical care, clothing, recreation, and education. The index uses 1982-1984 as its base period (CPI = 100).
What was the highest inflation rate in US history?
The highest annual inflation rate in U.S. history was approximately 23.7% in 1920, driven by the economic disruption following World War I. Other notable spikes include the double-digit inflation of the late 1970s and early 1980s (peaking at 13.5% in 1980) and the 2022 surge to around 8% following pandemic-era stimulus and supply chain disruptions.
How much has the dollar lost in purchasing power since 1913?
The U.S. dollar has lost approximately 97% of its purchasing power since 1913. What cost $1 in 1913 would cost over $32 today. This means $100 in 1913 had the equivalent buying power of over $3,200 in 2026. This dramatic decline illustrates why long-term savings need to earn returns that outpace inflation.
What is a good assumed inflation rate for future planning?
The Federal Reserve targets a 2% annual inflation rate. Historically, U.S. inflation has averaged about 3.2% per year since 1913. For conservative financial planning, many advisors recommend using 3% for general estimates and 4-5% if you want to stress-test your plans. Healthcare and education costs have historically risen faster than general inflation.
How does inflation affect my savings and investments?
Inflation silently erodes the purchasing power of money sitting in cash or low-yield savings accounts. If inflation averages 3% and your savings account pays 1%, you lose 2% of purchasing power annually. To preserve and grow wealth, your investments need to earn returns above the inflation rate. Stocks have historically returned 7-10% annually, outpacing inflation over the long term.