"I feel tired."

Translation: Jag känner mig trött.

[jerrethMobil]

What is the difference between mår and känner, I never know when to use which

[HelenCarlsson]

känna sig = feel:
känna sig trött - feel tired
känna sig pigg - feel alert
känna sig glad - feel happy
känna sig ledsen - feel sad

"Må" is almost always used with "bra", "dåligt" or "illa":
Jag mår bra - I am fine
Jag mår dåligt - I feel bad
Jag mår illa - I feel sick (as in having to throw up)

[Rekov]

I do not understand the difference between känna sig and känns. Why is this not Jag känns trött?

[HelenCarlsson]

"Kännas" is a so-called deponent verb and there is a very good post by Arnauti here, where you can read about the phrase "Rummet känns kallt" for example.

"Jag känns trött" sounds as if someone else thinks that I seem tired.

Two more examples:
It feels good = det känns bra
I feel good = jag mår bra = jag känner mig bra

[Sninguistics]

Wait, so would Jag känns trött be a valid way of taking about someone's opinion? Say, if I tacked on an enligt and a name at the end?

[HelenCarlsson]

You mean somehting like "Han tycker att jag verkar trött"? If so, it is "verkar".

"Han tycker att jag känns varm" works if he touches my forehead and thinks I have a fever.

[jQuasebarth]

Huh? I thought that "Jag är trött" would mean the same?

[Arnauti]

But then that would be I am tired in English. When both languages have the same possibilities, there's no reason to pick the other one.