The primary size of Danish poster has been in turned with the German film industry and therefore very similar. The most dominant sizes are:

23x33 - called the 'A1' which is a paper size that is common throughout Europe. posters vary an inch or so each way. This size is still in use.

27x39 - since the 70s, this size has been found primarily on US imports

38x54 - some larger more recent issues since the 90s.

 

Here are the Danish posters that we have in our Cinema Poster Archive so far.