GASTAT Updates the Methodology for Calculating WPI

GaStat_Logo
14-10-2026

The General Authority for Statistics (GASTAT) updated the methodology for calculating the Wholesale Price Index (WPI) in Saudi Arabia as part of its efforts to develop price statistics, keep pace with economic developments and changes, and apply relevant international statistical practices and standards.
The updated methodology includes several improvements, including updating the reference year and relative weights, enhancing geographical coverage, updating and expanding the basket of goods, increasing the number of pricing points and price quotations, and updating the classification used. These improvements enhance the comprehensiveness of the index and its representativeness of wholesale markets in Saudi Arabia.
GASTAT has adopted 2023 as the new reference year for the index, replacing the previous reference year of 2014. The relative weights of the index items have also been revised based on the 2023 Supply and Use Tables, import values, and agricultural census data. Furthermore, an annual chain-linking methodology has been introduced, enabling the relative weights to be updated each year to reflect the relative importance of domestic and imported goods included in the index basket and considering developments in the structure of goods traded in wholesale markets.
The updated methodology also expands the basket of goods from 343 to 554 items and introduces a revised product classification system. In addition, the number of cities covered by the index has increased from 3 to 23, ensuring coverage of all 13 administrative regions of Saudi Arabia. These changes were accompanied by updates to the sample design and the sampling frame of pricing points, as well as the use of geospatial technologies and data to distribute the covered pricing points.
It is worth noting that the WPI is a periodic statistical product among the economic statistics published monthly by GASTAT. The results will be published tomorrow, Thursday, in accordance with the updated methodology.

 

Read Also