The bed frame is adjustable to cater to smaller sized mattresses. I am also giving away two slatted mattress bases. You won’t need box springs with this. The cost of the mattress, bed frame, and slatted bases is included. The mattress is roughly 78”*78”. I have had it for two years. I am selling it because i am moving. The entire set would easily cost you more than $900 if you buy it new. Pickup from Mountain View