# Conversion coefficients

During the switch to an index with a new base year, conversion coefficients are used to compare the indices on the different bases and to compose a continuous series of indices from 1920 onwards.

Additionally, each product group has its own conversion coefficient.

From / To | 2013 | 2004 | 1996 | 1988 | 1981 | |
---|---|---|---|---|---|---|

2013=100 | Consumer price index | x 1,2240 | x 1,4067 | x 1,7265 | x 2,3356 | |

Health index | x 1,2077 | x 1,3740 | x 1.6566 | |||

2004=100 | Consumer price index | x 0,8170 | x 1,1493 | x 1,4105 | x 1,9082 | |

Health index | x 0,8280 | x 1.1377 | x 1.3717 | |||

1996=100 | Consumer price index | x 0,7109 | x 0,8701 | x 1,2273 | x 1,6603 | |

Health index | x 0,7278 | x 0.8790 | x 1.2057 | |||

1988=100 | Consumer price index | x 0,5793 | x 0,7090 | x 0,8148 | x 1,3528 | |

Health index | x 0,6036 | x 0.7290 | x 0.8294 | |||

1981=100 | Consumer price index | x 0,4282 | x 0,5241 | x 0,6023 | x 0,7392 |

The coefficients that appear in the same row (or column) allow the conversion from each monthly index of a given base (left of each line) to the other index bases (above the column).

However, these conversion coefficients should never be used to calculate partial indices or indices of elementary aggregates.

Table with all conversion coefficients (PDF, 45.8 Kb)

Conversion coefficients: for the sub-groups (PDF, 43.71 Kb)

History from 1920 onwards (XLS, 624 Kb) containing consumer price index and health index converted to all possible bases.

#### Index search

Obviously, you will not have to calculate the conversion to a given base year yourself. Our Index-search can do this for you.

If you are looking for a consumer price index or a health index for a specific month, simply enter the year and month. This generates the consumer price index and the health index for all available bases.