Quick answer
How big is a full (double) mattress?
54" × 75" (10" thick) — A full mattress (also called double) is 54 inches wide and 75 inches long. It provides 16 more inches of width than a twin.
Measurements
Dimensions.
- 54"
- Width
- 75"
- Length
- 10"
- Height
Doorway fit
Will a Full/Double Mattress fit through a doorway?
Will fit through with proper technique. Smallest dimension (thickness): 10". Standard interior door: 32". Standard exterior door: 36".
Fits with room to spare
Fits with room to spare
Fits with room to spare
Mattress size comparison
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 items and calculators.
Frequently asked
Questions we keep getting.
Will a full mattress fit through a standard doorway?
Yes. When turned on its side, the 10" thickness passes through a 32" door easily. The challenge is maneuvering the 54" width around corners — take doors off hinges for maximum clearance.
01What is the difference between a full and a queen mattress?
A queen is 6" wider (60" vs 54") and 5" longer (80" vs 75"). The queen is more comfortable for couples, while a full works well in smaller bedrooms for a single sleeper.
02Is a full mattress big enough for two people?
A full mattress gives each person only 27" of width — about the same as a crib. For couples, a queen (60") or king (76") is recommended for comfortable sleep.
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