Quick answer
How big is a California king mattress?
72" × 84" (10" thick) — A California king is 72 inches wide and 84 inches long — 4 inches narrower but 4 inches longer than a standard king. Best for taller sleepers.
Measurements
Dimensions.
- 72"
- Width
- 84"
- Length
- 10"
- Height
Doorway fit
Will a California King 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
| Size | Width | Length | Area |
|---|---|---|---|
| Twin | 38" | 75" | 2,850 sq in |
| Twin XL | 38" | 80" | 3,040 sq in |
| Full/Double | 54" | 75" | 4,050 sq in |
| Queen | 60" | 80" | 4,800 sq in |
| King | 76" | 80" | 6,080 sq in |
| Cal King ← | 72" | 84" | 6,048 sq in |
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 California king mattress fit through a standard doorway?
Yes, when on its side. The 10" thickness clears a 32" door easily. The 84" length is the main challenge — plan your path to avoid tight corners where the length could get stuck.
01Is a California king bigger than a king?
No — a Cal king has slightly less total area (6,048 sq in vs 6,080 sq in). It's 4" narrower (72" vs 76") but 4" longer (84" vs 80"). It's designed for height, not extra width.
02Are California king sheets hard to find?
Cal king bedding is less common in stores but widely available online. Note that king and Cal king sheets are NOT interchangeable — Cal king sheets are narrower and longer.
03