After a ten-year transition period starting 1879, the use of legacy units was outlawed by the beginning of 1889.
[1] On 28 January 1875 André Oscar Wallenberg suggested to the Swedish parliament that the metric system should be implemented in Sweden.
[2] After the suggestion was approved in the Swedish Parliament 22 May 1875, work started to draft a law for metrication.
During the debates, the length of the transition period, first planned until 1883, and the fact that Sweden already had changed to a decimal based measurement system in 1855 were discussed.
The law stated that the introduction should take place progressively from 1879 to 1888, and that the metric system should be used exclusively from the beginning of 1889.