Definition : Consumer price index (CPI) measures the change over time in the prices of goods and services for consumption by households. The main purpose of the CPI with a base year of 2003 is; is to calculate the inflation rate by measuring the change in the prices of goods and services subject to consumption in the market. For this purpose, all final monetary consumption expenditures of households, foreign visitors and corporate population in the country are taken into account. This concept excludes the production of households for their own consumption from consumption expenditures and the relative rents valid for households.

Classifications: Individual Consumption Classification by Purpose (COICOP) was used in determining the weights and calculating the index, and these expenditures were grouped under 12 main groups and 43 subgroups. 404 items are included in the index.
 
International and regional guidance:  There is no significant difference between Turkey’s methodology and the relevant international and regional standards set out in EUROSTAT.

Source of weights:  Household Budget Survey conducted with approximately 15 000 households (3 years total 45 000) from all socio-economic groups annually, institutional population survey, tourism survey for the expenditures of foreign nationals in Turkey and expenditure and turnover information obtained from administrative records. It is calculated by expanding the National Accounts Household Final Consumption Expenditure data with the change rates.

For seasonal products, a constant weight approach is used.

The period to which the current weights belong is:  December of the year (t-1).
 In the CPI with a base year of 2003 = 100, all final monetary consumption expenditures made for the purpose of consuming goods and services domestically are taken as basis. In the index, prices are compiled from a total of 228 districts, including all 81 provincial centers. Within the scope of CPI, 564 710 prices from 27 411 workplaces are compiled monthly and 5 246 tenants are followed within the scope of the index. The number of workplaces and prices may vary throughout the year depending on the seasonal structure. 

Population coverage:  Population coverage of the index; It is determined as the total population living in Turkey, without any discrimination based on income groups or geographical regions.

Geographic coverage:  All domestic final monetary consumption expenditures of households, foreign visitors and corporate population were taken into account.

FPrice coverage:  The price coverage of the index is determined as purchase prices. Prices are determined as cash payments including taxes, and installment sales or negotiated prices are not taken into account.