Mattress Size Chart
The standard US mattress size chart in inches, centimeters and square feet, sourced from the Better Sleep Council and cross-checked against a second retailer chart -- plus a tool to check which sizes actually fit your room.
Standard US mattress sizes
Width x length in inches and centimeters, and total floor-space square footage, for every standard US mattress size. Sourced from the Better Sleep Council and cross-checked against Tampa Mattress Factory's published chart — see sources below the table.
| Size | Inches (W x L) | Centimeters (W x L) | Floor space |
|---|---|---|---|
| Twin | 38" x 75" | 96.5 x 190.5 cm | 19.8 sq ft |
| Twin XL | 38" x 80" | 96.5 x 203.2 cm | 21.1 sq ft |
| Full (Double) | 53" x 75" | 134.6 x 190.5 cm | 27.6 sq ft |
| Queen | 60" x 80" | 152.4 x 203.2 cm | 33.3 sq ft |
| King | 76" x 80" | 193.0 x 203.2 cm | 42.2 sq ft |
| California King | 72" x 84" | 182.9 x 213.4 cm | 42.0 sq ft |
Less common sizes
Full XL and Olympic Queen exist but aren't carried by every manufacturer — confirm availability before ordering sheets or a frame. (Alaskan King and other oversized specialty names are left off this page: no primary source we could fetch and verify names consistent dimensions for them.)
| Size | Inches (W x L) | Centimeters (W x L) | Floor space |
|---|---|---|---|
| Full XL | 53" x 80" | 134.6 x 203.2 cm | 29.4 sq ft |
| Olympic Queen | 66" x 80" | 167.6 x 203.2 cm | 36.7 sq ft |
Which mattress sizes fit my room?
Enter your bedroom's dimensions and how much walking space you want to keep (along one open side of the bed and at its foot — this assumes the headboard sits against a wall). Default clearance is 24 in; adjust it to whatever feels right for you.
| Mattress size | Footprint | Result | Orientation |
|---|---|---|---|
| Twin | 38" x 75" | Fits comfortably | Standard |
| Twin XL | 38" x 80" | Fits comfortably | Standard |
| Full (Double) | 53" x 75" | Fits comfortably | Standard |
| Queen | 60" x 80" | Fits comfortably | Standard |
| King | 76" x 80" | Fits comfortably | Standard |
| California King | 72" x 84" | Fits comfortably | Standard |
| Full XL | 53" x 80" | Fits comfortably | Standard |
| Olympic Queen | 66" x 80" | Fits comfortably | Standard |
Worked example
Queen (60 in x 80 in) vs. King (76 in x 80 in): the King is 16 in wider at the exact same length, for 8.9 more square feet of mattress -- 42.2 sq ft vs. 33.3 sq ft. Split between two sleepers, that's 38 in per person on a King against 30 in on a Queen.
For the room-fit tool: in a common 10 ft x 10 ft bedroom (120 in x 120 in) with the default 24 in clearance, a King fits comfortably -- it needs 100 in of width (76 in mattress + 24 in clearance) against the room's 120 in, and 104 in of length against the same 120 in, both well inside the room. Shrink the room to 9 ft x 9 ft (108 in x 108 in) and a California King's length requirement (84 in + 24 in = 108 in) lands exactly on the room's own length -- it still just clears the clearance you asked for, the kind of boundary case worth checking with the tool above rather than eyeballing.
How the comparisons are computed
- Every width/length/area figure comes directly from the sourced 53 in x 75 in-style table above -- nothing below is typed independently of it.
- Centimeters: inches x 2.54, exact by the international definition of the inch. Exact by international definition: the 1959 International Yard and Pound Agreement fixes 1 inch = 2.54 cm exactly (not a measured or rounded figure).
- Square footage: width (in) x length (in) / 144, since a square foot is 12 in x 12 in = 144 sq in.
- Per-person width: mattress width / 2, the same arithmetic behind the Better Sleep Council's own "27 inches," "30 inches" and "38 inches" per-sleeper claims for Full, Queen and King.
- Room fit: the mattress's footprint (and, separately, footprint + your chosen clearance) is checked against your room's width and length in both orientations -- headboard against the width-wall or the length-wall -- and the better result is shown.
Sources: Better Sleep Council (Specialty Sleep Association / International Sleep Products Association), "Mattress Sizes" (fetched 2026-10-01) (https://bettersleep.org/mattress-sizes/); Tampa Mattress Factory, "Mattress Size Chart: Standard, RV & Custom Sizes" (fetched 2026-10-01) (https://tampamattress.com/mattress-size-chart/), used as a cross-check and as the source for Full XL and Olympic Queen.
Frequently Asked Questions
What is this chart based on?
Every dimension comes from the Better Sleep Council's own published chart (https://bettersleep.org/mattress-sizes/, fetched 2026-10-01) and is cross-checked against Tampa Mattress Factory's independently published chart (https://tampamattress.com/mattress-size-chart/, fetched the same day), which matches the Better Sleep Council's numbers exactly on all six standard sizes. Full XL and Olympic Queen come from the second source only, since the Better Sleep Council page doesn't list them. "Alaskan King" is deliberately left off this page -- no source we could actually fetch and read gave a verifiable dimension for it.
What's the difference between a Full and a Queen, and which is better for two adults?
A Full is 53 in wide; a Queen is 60 in wide -- 7 in more. Split evenly between two sleepers, a Full gives each person 26.5 in of width, while a Queen gives each person 30 in -- close to the Better Sleep Council's own description of a Full as "about the width of a crib" per sleeper. For two adults sharing nightly, the Queen's extra 3.5 in per person is the main reason it's the most common size for couples.
How much bigger is a King than a Queen?
A King is 16 in wider than a Queen (76 in vs. 60 in) and the same length (80 in both) -- so the extra space is entirely in width, not length. That works out to 8.9 more square feet of mattress (42.2 sq ft vs. 33.3 sq ft). Per sleeper, a King gives each of two people 38 in -- the Better Sleep Council notes that's "as much personal space as each would have on a twin bed."
Will a Queen mattress fit in my car?
A Queen mattress is 60 in x 80 in (5 ft x 6 ft 8 in) flat -- longer than the cargo area of almost every sedan or SUV, even folded in half, since most mattresses (especially memory foam/hybrid) shouldn't be bent sharply. It typically needs a pickup truck bed, a cargo van, a roof rack with the mattress bagged and strapped down, or delivery from the retailer. Check your specific vehicle's cargo dimensions against the chart above before attempting to haul one yourself.
Is a Full mattress the same as a Double?
Yes -- "Full" and "Double" are two names for the identical 53 in x 75 in mattress. "Double" is the older term, more common on vintage furniture and some sheet-set packaging; "Full" is the name used by nearly every mattress retailer today. There's no dimensional difference to account for.
How much walking space should I leave around a bed?
There's no single official number -- it depends on the room and how you use it. The room-fit tool above defaults to 24 in of clearance along one open side and at the foot of the bed, a commonly suggested comfortable minimum for walking past and making the bed, but you can set it lower for a tight room or higher if you want more breathing room. It assumes the headboard sits against a wall, so only the open side(s) need the clearance you choose -- it doesn't account for a door swing, closet access, or furniture.
These dimensions are sourced from the Better Sleep Council and cross-checked against a second published source (cited on this page), and the room-fit tool is a planning estimate based on the clearance you choose. Neither accounts for your bed frame, headboard, nightstands or door swing -- measure your actual room before buying.