How the Inflation Calculator Works
This calculator uses the CPI-U (Consumer Price Index for All Urban Consumers) annual average data published by the U.S. Bureau of Labor Statistics (BLS). Select a start year, end year, and dollar amount to see the inflation-adjusted equivalent value.
Formula: Adjusted Value = Original Amount × (CPIend / CPIstart)
Understanding Inflation and Purchasing Power
Inflation erodes the purchasing power of money over time. $1,000 in 1990 had the purchasing power of approximately $2,300 in 2026 — meaning prices roughly doubled over that 36-year period. The long-run average U.S. inflation rate since 1913 is approximately 3.2% per year.
Historical Inflation Highlights
The highest inflation period was 1979–1981, when annual CPI inflation peaked above 13%. The lowest sustained inflation was during the 1950s–1960s (1%–2% annually). The most recent spike peaked at 9.1% in June 2022, the highest since 1981, driven by COVID-era supply shocks and fiscal stimulus.
Frequently Asked Questions
Inflation is the rate at which the general level of prices for goods and services rises over time, eroding purchasing power. When inflation is 3%, a basket of goods that cost $100 last year costs $103 today.
The calculator uses the formula: Adjusted Value = Original Amount × (CPI End Year / CPI Start Year). CPI (Consumer Price Index) is published monthly by the U.S. Bureau of Labor Statistics and measures the average change in prices paid by urban consumers.
This calculator uses the CPI-U (Consumer Price Index for All Urban Consumers, 1982-84=100) annual averages published by the U.S. Bureau of Labor Statistics (BLS). Data covers 1913 through 2026. Values for 2025–2026 are estimates based on the latest available BLS releases.
From 1913 to 2024, the average annual inflation rate in the U.S. was approximately 3.2%. The highest inflation decade was the 1970s (averaging 7.1%/year). The lowest sustained rates were in the 1950s–60s (1%–2%/year).
Purchasing power is the value of a currency in terms of what it can buy. If $100 in 1990 has an equivalent purchasing power of $230 in 2026, it means prices have risen such that it takes $230 to buy what $100 bought in 1990.
The 1970s "stagflation" was caused by OPEC oil embargoes (1973 and 1979), loose monetary policy, supply shocks, and wage-price spirals. Inflation peaked at 14.8% in April 1980. The Fed's aggressive rate hikes under Paul Volcker finally broke the inflationary cycle by 1983.
Post-COVID inflation was driven by massive fiscal stimulus ($5+ trillion), supply chain disruptions, pent-up consumer demand, and labor shortages. CPI peaked at 9.1% in June 2022 — the highest since 1981. The Fed raised rates from near 0% to 5.25%–5.50% to combat it.
Inflation erodes real returns. If your investment earns 7% but inflation is 3%, your real return is approximately 4%. Stocks historically outpace inflation over long periods. Bonds and cash are most vulnerable to inflation erosion. TIPS (Treasury Inflation-Protected Securities) are specifically designed to protect against inflation.
The Federal Reserve targets 2% annual inflation as measured by the PCE (Personal Consumption Expenditures) price index. This target was formally adopted in 2012. The Fed uses interest rate policy and its balance sheet to influence inflation toward this target.
CPI measures prices paid by urban consumers and is used in this calculator. PCE (Personal Consumption Expenditures) is the Fed's preferred measure, includes more spending categories, and uses chain-weighting to account for consumer substitution. PCE typically runs 0.3%–0.5% lower than CPI annually.