What is inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time, causing purchasing power to fall. It is most commonly measured by the Consumer Price Index (CPI).
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Inflation Calculator | 1ClickTools
Calculate the effect of inflation on purchasing power using historical US CPI data from 1913 to 2025. Find the real value of money over time, annual.
Frequently Asked Questions
What is the CPI?
The Consumer Price Index (CPI) is a measure of the average change over time in the prices paid by urban consumers for a representative basket of goods and services. It is published monthly by the US Bureau of Labor Statistics.
How is the inflation adjustment calculated?
The formula is: Adjusted Amount = Original Amount × (CPI in Target Year / CPI in Base Year). For example, if CPI doubled from 100 to 200, then $100 in the base year is equivalent to $200 in the target year.
What was the highest inflation period in US history?
The 1970s experienced the highest sustained US inflation of the modern era, with annual rates reaching 14.8% in 1980. This was driven by oil price shocks and expansionary monetary policy.
Is this tool specific to the US?
Yes. This calculator uses US CPI data and reflects US dollar purchasing power. Inflation rates vary significantly by country. For other countries, consult local statistical bureaus like the ONS (UK) or Eurostat (Europe).
How accurate is this inflation calculator tool?
All processing runs entirely in your browser using verified algorithms. Results are computed with full double-precision — no server-side rounding or data transmission occurs.