Mattress Through Doorway Fit Calculator
Choose a mattress size or enter your own, add its thickness and the doorway’s clear opening, and see whether it goes through on its long edge, on end, or flat — without counting on it bending.
Mattress Through Doorway Fit Calculator calculates in your browser.
See whether a mattress or box spring gets through the door
Most mattresses go through a doorway on their long edge, where the opening only has to be as wide as the mattress is thick and as tall as it is wide. Whether that works depends on the mattress size against the door’s height, which is where kings and box springs get caught. This calculator checks standard US sizes from Twin to California King, custom sizes, and boxed mattresses on edge, on end, and flat, and explains how the construction — innerspring, hybrid, all-foam, or a rigid box spring — changes what you can do about a near miss. It never assumes a mattress can be bent or folded. It is for anyone buying a mattress, moving one, or taking a box spring up to a bedroom.
How to use the Mattress Through Doorway Fit Calculator
- Choose your unit and the mattress size, or a custom size, or “Still in its box”.
- Enter the thickness at the edge, including any pillow top, and the construction.
- Measure the doorway with the door open: clear width and clear height.
- Say whether it comes straight at the door or turns in from a hallway.
- Read the result and the tightest point; if it is a box spring that doesn’t fit, look at a split version.
How the check works
On its long edge: thickness ≤ door clear width and mattress width ≤ door clear height
On its end: thickness ≤ door clear width and mattress length ≤ door clear height
The mattress is flat and unbent in every check
On its long edge a mattress stands as tall as it is wide. A king is 76 in wide, so it needs more than 75 in of door height; a California King is longer but narrower at 72 in, so it goes through the same 75 in door that the king can’t.
| Mattress | Thickness | Doorway | Result | Tightest point |
|---|---|---|---|---|
| Queen (60 × 80 in) | 12 in | 30 × 80 in | Likely fits | Door width: 18 in to spare |
| King (76 × 80 in) | 14 in | 30 × 80 in | Likely fits | Door height: 4 in to spare |
| King (76 × 80 in) | 14 in | 30 × 75 in | Does not fit under the conditions checked | Door height: 1 in too big |
| California King (72 × 84 in) | 14 in | 30 × 75 in | Likely fits | Door height: 3 in to spare |
Calculated on your device
- The check runs in your browser as you type; nothing is sent to a server.
- Your measurements and results are not sent to Looty Tools or stored.
- The calculator area, including the diagram, is masked from session-recording analytics, so what you enter isn’t captured in recordings.
Limitations
- Every check is for the mattress flat and unbent. Bending or folding is never assumed — whether it is safe depends on the construction and the manufacturer.
- Standard sizes are nominal US sizes; real mattresses vary by about an inch. Measure your actual mattress and enter a custom size before relying on the result for a move or delivery.
- A straight approach assumes room in line with the door on both sides at least as long as the mattress. Turning in from a hallway uses a corridor model tighter than a real room, so a failed turn asks for more measurements.
- Stairs and hallway corners are usually harder than the door for a long mattress; check them with the Stairwell and Hallway Corner calculators.
- Sizes up to 100 ft (30.48 m) in inches, feet, centimeters, or meters.
Related calculators
- Furniture Through Doorway Fit CalculatorCheck whether a piece of furniture can pass through a doorway.
- Hallway Corner Turn CalculatorEstimate whether furniture can make a turn through a hallway.
- Stairwell Furniture Clearance CalculatorCheck whether furniture clears a stairwell.
- Length ConverterConvert inches, feet, meters, and other lengths.
Guides
- Mattress Sizes and DoorwaysStandard mattress sizes from Twin to California King against common door sizes: why height, not width, is the limit on edge, and why a king can get stuck where a California king doesn’t.
- Why Box Springs Get StuckA box spring is a rigid frame, so it only fits where its exact measurements do. How that changes doorways and stairs, and the usual fixes from split foundations to low-profile bases.
- Bending a MattressHow foam, hybrid, and innerspring mattresses respond to bending, what to check with the manufacturer before folding one, and the unbent options to try first.
Mattress Through Doorway Fit Calculator FAQ
- Will a king mattress fit through a 30 inch door?
- Usually, on its long edge: a 76 × 80 in king carried on its side is 76 in tall and as wide as it is thick. A 14 in-thick king clears a 30 × 80 in door that way with 4 in of height to spare — but not a 75 in-high door, where a 72 in-wide California king still fits.
- Can I bend the mattress to get it through?
- The calculator never assumes it. Some mattresses flex when carried on edge, but folding can damage coils or crease foam, and some warranties exclude it. Check the manufacturer’s guidance; the result here is for the mattress flat and unbent.
- Why does the mattress type matter if the result is the same?
- The geometry is the same, but what you can do about a near miss isn’t. A box spring or foundation is a rigid frame that can’t flex at all — if it doesn’t fit, a split version (two halves) is the usual answer. A foam or hybrid mattress may sag when carried, which matters more on stairs and corners.
- What sizes does it use for each mattress?
- Nominal US sizes: Twin 38 × 75, Twin XL 38 × 80, Full 54 × 75, Queen 60 × 80, King 76 × 80, and California King 72 × 84 in. Real mattresses vary by about an inch, so measure yours and enter a custom size before relying on the result. Thickness is always yours to enter.
- Does a bed-in-a-box need checking?
- Only the box. Choose “Still in its box” and enter its size; a 42 × 19 × 19 in box passes almost any door. The mattress expands once unpacked, so unpack it in the room it will be used in.
- Are the measurements I enter sent anywhere?
- No. The check runs in your browser as you type. Your measurements and results are not sent to Looty Tools or stored, and the calculator area is masked from session-recording analytics. Refreshing the page clears it.
