CPI, Reference CPI and Index Ratio Consumer Price Index (CPI) Reference CPI Index Ratio Remark: The CPI data for the earliest base year is sourced from the Ministry of Commerce (http://www.price.moc.go.th), while the CPI data for other base years is derived through calculation. * For more details on the calculation of the CPI Monthly Reference Index (CPI), Daily Reference CPI (Reference CPI), and the Inflation Index Ratio (Index Ratio), please refer to the detailed explanation provided here. Remark: 1. Daily Reference CPI is calculated using the CPI data obtained from Bureau of Trade and Economic Indices, Ministry of Commerce - http://www.price.moc.go.th. 2. Daily Reference CPI from April-2010 to February-2013 calculation is based on CPI (Base B.E. 2550). 3. Daily Reference CPI from March-2013 to February-2017 calculation is based on CPI (Base B.E. 2554). 4. Daily Reference CPI from March-2017 to February-2021 calculation is based on CPI (Base B.E. 2558). 5. Daily Reference CPI from March-2021 to February-2025 calculation is based on CPI (Base B.E. 2562). 6. Daily Reference CPI starting from March-2025 calculation is based on CPI (Base B.E. 2566). 7. The following formula is used for deriving the Daily Reference CPI ( Ref CPI ) on Day t. * For more details on the calculation of the Daily Reference CPI (Reference CPI) and the Inflation Index Ratio (Index Ratio), please refer to the detailed explanation provided here. Remark: 1. Inflation Index Ratio from July-2011 to February-2013 calculation is based on Reference CPI (Base B.E. 2550). 2. Inflation Index Ratio from March-2013 to February-2017 calculation is based on Reference CPI (Base B.E. 2554). 3. Inflation Index Ratio from March-2017 to February-2021 calculation is based on Reference CPI (Base B.E. 2558). 4. Inflation Index Ratio from March-2021 to February-2025 calculation is based on Reference CPI (Base B.E. 2562). 5. Inflation Index Ratio starting from March-2025 calculation is based on Reference CPI (Base B.E. 2566). * For more details on the calculation of the Inflation Index Ratio (Index Ratio), please refer to the detailed explanation provided here.