The right mattress size comes down to two questions: how many people are sleeping in it, and how much room is left after the bed is in the room. Here are the six standard mattress sizes we stock at LA Mattress, with dimensions, who each one fits, and the minimum bedroom size where it feels right.
The smallest standard adult size. Fits kids past the toddler stage, single adults who don't want to take up the whole room, and guest bedrooms. Two twins side-by-side make a king-sized space without committing to a king mattress — useful in older homes with narrow doorways and stairs.
Best for bedrooms 7×10 ft and up. Shop Twin mattresses →
Same width as a Twin, five inches longer. The standard college-dorm size, also the right pick for taller single sleepers (over 6'0”) who don't need extra width. Two Twin XL mattresses paired on a split-king adjustable base give each partner independent recline control on a king-sized footprint.
Best for bedrooms 7×11 ft and up. Shop Twin XL mattresses →
The traditional “double bed” — wider than a Twin, same length. Good for single sleepers who like to spread out, or for tight couples (younger couples in smaller LA apartments often start here). It's a comfortable solo size and a tolerable two-person size for short stretches.
Best for bedrooms 9×10 ft and up. Shop Full mattresses →
The most popular size we sell, by a wide margin. Six inches wider than a Full, five inches longer. Comfortably fits two adult sleepers with room for a pet at the foot, and works in most apartment-sized master bedrooms. If you're buying for a couple and you're not sure which size to pick, start here.
Best for bedrooms 10×11 ft and up. Shop Queen mattresses →
Sixteen inches wider than a Queen — enough that two adults can sleep without crowding each other. The right size if either partner is a restless sleeper, if you co-sleep with kids or pets, or if you simply want the most room money can buy without going taller. Note: doorways and stairs in older LA homes sometimes won't fit a king — measure before you order, or pick a split king (two Twin XLs).
Best for bedrooms 12×13 ft and up. Shop King mattresses →
Four inches narrower than a King but four inches longer — the right pick if either sleeper is over 6'2”, or if the bedroom is long and narrow. A Cal King fits where a regular King won't (long rectangular rooms), and gives taller sleepers room for their feet without dangling.
Best for bedrooms 12×14 ft and up. Shop California King mattresses →
Leave at least 24 inches of walking space on the sides of the bed, and 36 inches at the foot if a dresser or closet is there. Measure the room first, then pick the largest mattress that still leaves that clearance. In doubt, size up — it's the one piece of furniture you'll regret undersizing.
Stop by any of our five LA showrooms to lie down on every size side-by-side, or take our 8-question sleep quiz for a tailored recommendation. Call us at (800) 218-3578 if you want a second opinion.