The central election authority shall decide, no later than 30 April in the year when ordinary elections are held, 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 receive the remaining seats in order of the surpluses that arise when the calculation is made. If the surplus figure is the same in two or more constituencies, the constituency that receives the seat shall be determined by drawing lots.