Retail Price Indices (RPI and RPIX) explained
The retail price indices are numbers that represent the average overall cost levels of goods in the RPIX and RPI "shopping baskets" at a point in time. The percentage change between two index figures is the measure of inflation between those points in time.
Please note that following each household expenditure survey (when the basket of goods is updated) the indices are rebased (i.e. set back to 100). Care should be taken to ensure that calculations are only made between index figures from the same base base year.
The spreadsheet below gives the quarterly index figures for both RPIX and RPI for each base year available.
If you are looking for the index figures in order to calculate inflation between two dates, you may find it easier to use the inflation calculator, which will do the calculations for you.
Document downloadsIndex figures March 2013 RPIX and RPI index figures dating back to 1965
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