Currently calculated in base 100 in 2010, the price indices for imported raw materials are Laspeyres chain-linked indices.

The weightings reflect the share of each commodity in the French imports. They are updated in March of every year.

For most commodities, the prices considered are spot prices: quantities purchased for immediate delivery, which differs from the quotation of futures contracts. These are reference prices for the market. For some commodities, the prices quoted are futures prices: in these cases, the title of the series specifies the nature of the maturity in question.