It's hard to say because mattresses come in so many thicknesses now. I think mine is about 12-13", so for me it would have to be about 88" wide. Many of them are even thicker than what I have. I like the look of it going a couple of inches past the top of the box spring (I use a dust ruffle. A bedspread (to the floor) would be too heavy for me. I hate the weight on my feet.