Knowledge Guide™ · Buying
What size mattress fits my bedroom?
Dimensions, clearances and the measurement that people forget.
Key points
- • Queen 60 × 80, King 76 × 80, Cal King 72 × 84 inches
- • 24–30 inches of clearance per walked side
- • A frame adds 2 to 5 inches beyond the mattress
- • Measure the hallway and stair turns before ordering
- Walking clearance
- The floor space between the bed frame and the nearest wall or furniture on each side you use to walk.
Standard dimensions
Every size in inches, so you can tape them out on the floor before committing.
- • Twin 38 × 75 · Twin XL 38 × 80
- • Full 54 × 75 · Queen 60 × 80
- • King 76 × 80 · California King 72 × 84
Room fit rules
Tape the bed footprint on the floor including the frame, then walk it. If you turn sideways to pass, the bed is too big for the room regardless of what the tape measure says on paper.
Bedding depth
Measure mattress height and add two inches for a protector. Standard sheets fit to about 12 inches; deeper hybrids need 15-to-18-inch pockets. This is the single most common post-purchase annoyance and it is entirely avoidable.
Common questions
Compare your options
Queen vs King
A king gives each partner 16 more inches of width than a queen splits between two. The deciding factor is usually the room, not the bed.
CompareMattress Thickness Compared
Thickness affects how comfort layers stack, how tall the bed sits and whether your sheets fit — but it does not by itself indicate quality.
CompareRead next
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