The Swedish Migration Board requires that students show that they can cover living expenses of SEK 8 010 per month in order to obtain a residence permit. Those who intend to study for one year or more must show that they can support themselves for 10 months per year.
More information: A Student Budget for Living and Studying in Umeå
Remember that exchange rates may change quite rapidly. Keep an eye on the SEK rate, the Migration Board will require that you show the 8 010 SEK per month at the time when your application is approved. The rate may very well change over the time from application to approval.