The central election authority shall no later than 30 April in the year when a general election shall be held decide how many permanent constituency seats each constituency shall have. This shall be done in the following way. 

Each constituency shall have a permanent constituency seat for each time that the number of persons who are entitled to vote in the constituency is evenly divisible by one 310th of the number of persons who are entitled to vote in the whole of Sweden.

Unless all permanent constituency seats can be distributed in this way, the constituencies will obtain the remaining seats in order according to those surpluses that arise on the calculation. If the surplus figure is the same in two or more constituencies, the constituency that shall obtain the seat shall be determined by drawing lots.