king

13x12 may be a bit too small for a king IMHO

Looks like a king, but the wide angle of the lens makes it look wider than it is long, so it might be deceiving.

It is hard for me

It could be a king, but it could also be a queen turned sideways!

From the apparent length of the bolster I think it is a king

Thanks guys

This is definitely a king size. And your room is plenty big for a king bed, no worries! A king measures roughly 80" square, so regardless of which wall you place it on, you will have either 42" or 36" on either side of the bed for night tables, which is more than enough room. I say go for it!

Probably a king, but this room looks slightly bigger than the dimensions of your room. I would suggest a queen size bed for your space to allow for room to move and for dressers,etc. Good Luck!