If you're redecorating a bedroom and want to buy essentials made to last, it's a good idea to utilize your Costco membership.
And if you plan on moving the furniture, a full size mattress and bed frame will be easier to pick up than a queen (although we highly recommend getting a helping hand for either size.) ...
A typical queen-size mattress is 60 by 80 inches ... tape to represent the footprint of your area rug, furniture, and other features of the bedroom. It's cheap, easy, and causes zero damage.