Hi rebeckap and welcome to Apple Discussions.
The Apple World Travel adapter kit almost certainly has the required adapter for Sweden. If you refer to
This Article it gives specifications for a type of plug used widely in Europe with the exception of the UK and the Republic of Ireland. An alternative, with grounding bars, is shown if you scroll down the same page to item 'F'. This too, apparently, is in common use throughout Europe.
Unless you are planning to travel outside Europe the Apple WTAK maybe OTT for your needs. Any converter which converts US to Europe will do the job perfectly well, though, admittedly, not so tidily as the Apple adapter which will fit directly to your power brick. A generic adapter should be available in hardware stores, electrical suppliers, etc. If you go for this option
don't forget to take your US power brick connector with you. You will need it to connect with the Europe adapter.
Enjoy your trip,
Adrian