Quick answer
What are standard mattress sizes?
Standard US mattress sizes are: Twin (38" x 75"), Twin XL (38" x 80"), Full/Double (54" x 75"), Queen (60" x 80"), King (76" x 80"), and California King (72" x 84"). Thickness varies from 8-14 inches depending on type.
Measure smart
What to measure.
Four numbers decide nearly every fit check. Get these right and the rest follows.
- 01Width, depth, and height of the item at its widest points, including feet, arms, handles, and headboards.
- 02The clear opening of the space, not the frame. A 36-inch door gives roughly 32 inches once the door and stops are accounted for.
- 03The item's smallest dimension. It decides whether tilting or turning it on its side gets it through.
- 04Diagonal clearance at turns, landings, and corners, where the real bottleneck usually is.
Don't make these
Common mistakes.
Most “it didn't fit” stories trace back to one of these oversights.
- ⚠Measuring the door frame instead of the clear opening, then losing two inches you assumed you had.
- ⚠Forgetting that feet, arms, and handles add to the nominal size printed on the box.
- ⚠Treating a soft mattress and a rigid frame the same. One compresses, the other does not.
- ⚠Planning the doorway but ignoring the turn at the top of the stairs.
Go deeper
Related dimensions and guides.
Frequently asked
Questions we keep getting.
Can a king mattress fit through a standard door?
A king mattress (76" x 80") is challenging but possible through a standard 32" door. It requires significant bending and diagonal maneuvering. A 36" exterior door provides easier passage.
01What is the difference between King and California King?
King mattresses are 76" x 80" (wider), while California King is 72" x 84" (longer but narrower). Cal King is better for tall individuals; King provides more width for couples.
02How much does a mattress compress when moving?
Most innerspring and hybrid mattresses compress 2-4 inches temporarily when bent. Memory foam and latex mattresses can compress more but should not be folded for extended periods.
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