Understanding the Consumer Price Index (CPI) and Inflation Measurements

The Consumer Price Index (CPI) is the most widely used measure of inflation in the global economy. Published monthly by government agencies like the US Bureau of Labor Statistics, it tracks the average change over time in the prices paid by urban consumers for a market basket of goods and services.

The CPI market basket includes everyday expenses such as food, clothing, housing, transportation, medical care, and energy. By comparing the cost of this basket from one month to the exact same month in previous years, economists determine the rate of inflation, which reflects shifts in the cost of living.

CPI data is critical because it directly influences government policies, interest rate adjustments by central banks, and cost-of-living adjustments (COLA) for pensions and wages. When inflation is high, the CPI rises rapidly, signaling a decrease in currency purchasing power.

Understanding CPI helps individuals evaluate whether their wages are keeping pace with real-world prices. Our Inflation Calculator uses historical US CPI and Eurostat metrics to let you see how the purchasing power of your money has changed over time.