Not sure which mattress size makes the most sense for your space? You’re not alone—it’s not always obvious. Here are a few things to keep in mind when choosing:
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How much space do you (and possibly a partner) need to sleep comfortably?
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Will the mattress leave enough room to move around, relax, or fit other furniture in the bedroom?
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Is the size really worth the cost? For example, a King-size bed might be overkill if you’re sleeping solo—unless you’re just trying to fill a large room.
Still unsure? Here’s a breakdown of the most common mattress sizes to help you decide:
Twin
Size: 39″ x 74″ (sometimes 75″)
The Twin is the smallest standard mattress size after toddler beds and cribs. It’s perfect for kids, teens, or smaller adults in tight spaces. Not ideal for sharing with a partner, though.
Twin XL
Size: 39″ x 80″
Same width as a Twin but 6 inches longer—great for taller kids, teens, or adults with narrow bedrooms. It’s also the go-to size for college dorm beds, so Twin XL sheets are easy to find.
Full (or Double)
Size: 54″ x 74″ (sometimes 75″)
A Full gives you more width than a Twin—15 inches more, to be exact. It works well for solo sleepers who want more room or for smaller couples in cozy spaces.
Queen
Size: 60″ x 80″
One of the most popular sizes. It’s roomy enough for most couples and super spacious for solo sleepers. If your bedroom can handle it, a Queen is a solid all-around choice.
King (Standard/Eastern King)
Size: 76″ x 80″
Same length as a Queen, but much wider—ideal for couples who want extra room or for families who co-sleep with kids. Probably more than necessary for one person, unless you love to sprawl or have a big bedroom to fill.
Split King
Same overall size as a regular King, but divided into two Twin XL mattresses—perfect if you want adjustable settings on each side or need to minimize motion transfer between partners.
California King
Size: 72″ x 84″
Longer and slightly narrower than a Standard King. Best for taller folks who need the extra legroom. You give up a bit of width, but you gain those crucial four inches in length.
