Consumer Price Index Formula

The Consumer Price Index or CPI is known as the index that is used to measure the level of retail inflation in an economy by taking into account the changes in price of the most commonly used goods and services by consumers.

CPI is denoted by a basket of goods and services, and the changes in this basket is studied over a time period. It is commonly used by policymakers and the economists as a measure of inflation, along with the GDP deflator.

There are four steps in the calculation of CPI and the level of inflation in an economy, which are as follows:

  1. Fixing a basket of goods and services as a reference
  2. Calculating the cost of the selected basket
  3. Calculating the CPI
  4. Calculating the Inflation Rate

Also check: MCQs on Consumer Price Index

Consumer Price Index (CPI) can also be used for determining the cost of living of the people of a country. In addition to that, CPI can also be used as a reference point for understanding various parameters like the real value of money, wages, and also the purchasing power of the currency of the nation.

The consumer price index formula can be mathematically represented as follows:

Consumer price index (CPI) = [Cost of the basket in the current year/Cost of the basket in the base year] x 100

Or it can be represented as

CPI = [Cost of the basket (t) ÷ Cost of the basket (0)] x 100

This article was about the concept of consumer price index formula, which plays an important role in determining the inflation rate in an economy. For more such intriguing concepts, stay tuned to BYJU’S.

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Elastic Demand Formula Marginal Revenue Formula Money Multiplier Formula
Inflation Rate Formula Total Revenue Formula Consumer Surplus Formula
Unemployment Rate Formula Nominal GDP Formula Balance of Payments Formula
GDP Formula Real GDP Formula Income Elasticity of Demand Formula


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