This bed size chart covers every standard US mattress size: Twin 38″ × 75″, Twin XL 38″ × 80″, Full 54″ × 75″, Queen 60″ × 80″, King 76″ × 80″ and California King 72″ × 84″. King is the widest standard bed at 76 inches (193 cm); California King is four inches narrower and four inches longer. The rest of this bed size chart covers what those numbers mean in a real room: clearance, frame footprint, doorway fit, matching sheets and overseas sizes.
Bed size chart: every standard mattress size in inches, feet and cm
These are the dimensions the US mattress industry works to. Brands drift by up to about an inch, and that inch matters for fitted sheets and tight frames, so read the spec before you order anything that has to fit around the mattress.
| Size |
Inches |
Feet |
Centimetres |
Sleeps |
| Crib (full-size) |
27¼ × 51⅝ minimum |
2’3″ × 4’3″ |
69.2 × 131.1 |
Infant to toddler |
| Twin (Single) |
38 × 75 |
3’2″ × 6’3″ |
96.5 × 190.5 |
One child or small adult |
| Twin XL |
38 × 80 |
3’2″ × 6’8″ |
96.5 × 203.2 |
One tall teen or adult |
| Full (Double) |
54 × 75 |
4’6″ × 6’3″ |
137.2 × 190.5 |
One adult; two at a squeeze |
| Queen |
60 × 80 |
5’0″ × 6’8″ |
152.4 × 203.2 |
Two adults |
| Olympic Queen |
66 × 80 |
5’6″ × 6’8″ |
167.6 × 203.2 |
Two adults, extra width |
| King (Eastern King) |
76 × 80 |
6’4″ × 6’8″ |
193 × 203.2 |
Two adults plus kids or dog |
| California King |
72 × 84 |
6’0″ × 7’0″ |
182.9 × 213.4 |
Two adults, one or both tall |
| Split King (2 × Twin XL) |
38 × 80 each |
3’2″ × 6’8″ each |
96.5 × 203.2 each |
Two adults, separate bases |
| Wyoming King |
84 × 84 |
7’0″ × 7’0″ |
213.4 × 213.4 |
Family co-sleeping |
| Texas King |
80 × 98 |
6’8″ × 8’2″ |
203.2 × 248.9 |
Very tall sleepers |
| Alaskan King |
108 × 108 |
9’0″ × 9’0″ |
274.3 × 274.3 |
Whole household |
The crib row is a legal minimum rather than a marketing size. Under the federal crib mattress rule, which incorporates ASTM F2933, a full-size crib mattress must measure at least 27¼ inches wide and 51⅝ inches long, and thickness is capped at six inches, so there is no gap a baby can slip into. If you can fit more than two fingers between mattress and crib side, the mattress is wrong for that crib.
Twin, Twin XL and Full: who each one actually fits
Twin, 38″ × 75″ (96.5 × 190.5 cm). The default for kids’ rooms, bunks, daybeds and trundles. The catch is length: 75 inches is 6’3″, and once you subtract pillow space anyone over roughly 5’10” meets the end rail. Fine for a nine-year-old, frustrating for a fifteen-year-old.
Twin XL, 38″ × 80″ (96.5 × 203.2 cm). Same width, five more inches of length — the same 80 inches you get on a queen or king. It is the dorm standard, the size a growing teen won’t age out of, and one half of a split king. Downside: fewer frames, and shops stock the sheets less deeply than plain twin.
Full / Double, 54″ × 75″ (137.2 × 190.5 cm). Sixteen inches wider than a twin but no longer — the quirk people miss. A full is a generous solo bed and a space-saving guest bed, but for two adults it gives each person 27 inches, narrower than a crib mattress is wide. Layout specifics are in our full size bed dimensions guide.
Queen vs King vs California King
This is the decision most people are actually making, and it comes down to width per person, footprint and length.
| Size |
Dimensions |
Width per sleeper |
Best for |
Skip it if |
| Queen |
60″ × 80″ (152 × 203 cm) |
30″ |
Most couples; rooms around 10′ × 10′; the widest bedding and frame selection of any size |
You co-sleep with kids or a large dog |
| King |
76″ × 80″ (193 × 203 cm) |
38″ |
Restless sleepers, co-sleeping, anyone who wants a full single’s width each |
Your room is under about 11 feet wide, or your stairs turn sharply |
| California King |
72″ × 84″ (183 × 213 cm) |
36″ |
Sleepers around 6’2″ and over; long, narrow rooms |
You want maximum width, or you buy bedding on sale — Cal King stock is thinner |
A king gives each partner 38 inches, exactly the width of a twin XL. A queen gives 30 inches each, a full 27. Those eight-inch steps look small on a bed size chart and feel large at 3 a.m. when someone rolls over.
Length is a separate question from width. Queen, king and split king are all 80 inches (6’8″) long, so if your heels hang off a queen, a king will not fix it — only California King (84″) or a specialty long size will. Deep dives on each: queen size bed dimensions and our king size bed dimensions guide.
King size bed dimensions in a real bedroom
A standard king (Eastern King) is 76 inches wide by 80 inches long, 193 × 203 cm, 6’4″ × 6’8″. Two twin XL mattresses pushed together make the identical footprint, which is why split king exists and why adjustable-base shoppers usually end up there.
In practice a king needs about 11 to 12 feet of wall-to-wall width before the room stops feeling like a showroom. It is also the hardest standard size to move: a compressed bed-in-a-box solves the stairwell problem, a traditional innerspring king often does not. Choosing between the two? Our king vs California king comparison puts the frames and layouts side by side.
Minimum room size and walkway clearance by bed size
Mattress dimensions tell you what fits; clearance tells you what is liveable. The usual design rule of thumb is 24 to 30 inches (61–76 cm) of clear walkway on every side you use, plus about 36 inches in front of a dresser so drawers open. These are conventions, not building code — one side against a wall is normal in a small room, and no bed size chart can tell you how you move around your own room.
| Mattress |
Tight but workable room |
Comfortable room |
What you lose in the tight version |
| Twin |
7′ × 9′ |
8′ × 10′ |
Desk or second dresser |
| Twin XL |
7′ × 10′ |
8′ × 10′ |
Foot-of-bed walking space |
| Full |
9′ × 9’6″ |
10′ × 11′ |
One of the two nightstands |
| Queen |
10′ × 10′ |
11′ × 12′ |
Bench, chair or a wide dresser wall |
| King |
11′ × 11′ |
12′ × 13′ |
Comfortable side clearance; bed dominates |
| California King |
11′ × 12′ |
12′ × 14′ |
Space at the foot for a door swing |
| Wyoming / Texas / Alaskan |
13′ × 14′ |
14′ × 16’+ |
Most other furniture |
Do the maths yourself: room width minus mattress width, divided by two. A 76-inch king in an 11-foot (132-inch) room leaves 28 inches per side — fine until you add a nightstand, which eats 16 to 24 inches of it.
Mattress size vs bed frame footprint (the frame is always bigger)
A bed size chart lists the mattress. Nobody sleeps on a bare mattress, so add the frame:
- Metal platform frames: add roughly 0 to 2 inches of width; the mattress sits nearly flush.
- Wood platform and panel beds: usually add roughly 2 to 5 inches in width and length for side rails.
- Upholstered beds: padded rails commonly add 4 to 8 inches of width — the most-missed measurement of all.
- Headboards: add roughly 2 to 6 inches of length, more if it is wall-mounted with a gap.
- Footboards and storage benches: add another 3 to 12 inches you have to walk around.
So a 76-inch king mattress can become an 82-inch upholstered bed — the difference between two nightstands fitting and not. Manufacturer listings give full exterior dimensions in the spec tab; use those, not the size name. Our guide to choosing the right bed frame covers the rest if you are buying both at once.
Will it get through the door and up the stairs?
Standard US interior doors are 80 inches tall and 28 to 32 inches wide, leaving roughly 30 to 31 inches of clear opening on a 32-inch door once you count the stop moulding. Pulling the door off its hinges buys about another 1.5 inches.
A mattress travels on its side, so its length becomes its height in the doorway. A queen or king at 80 inches is exactly the height of a standard door frame — it goes through because mattresses flex, but it is a squeeze. A California King at 84 inches has to be tilted, and rigid latex or dense foam flexes far less than a pocket-spring build. Measure the narrowest point of the whole route: front door, tightest hallway turn, stair landing, bedroom door. A bed-in-a-box sidesteps most of this; a split king handles the rest.
US vs UK, EU and Australian bed sizes
Names travel between countries; measurements do not. A UK king is narrower than a US queen, and an EU king is closer to a US queen than to a US king — which is why bedding bought abroad so often fits badly. This part of the bed size chart is worth a screenshot if you are moving.
| Name |
US |
UK |
EU / IKEA |
Australia |
| Single |
Twin 38″ × 75″ (96.5 × 190.5 cm) |
90 × 190 cm (3’0″ × 6’3″) |
90 × 200 cm |
~92 × 188 cm |
| Long single |
Twin XL 38″ × 80″ (96.5 × 203 cm) |
90 × 200 cm (small long single) |
90 × 200 cm |
King single ~107 × 203 cm |
| Double |
Full 54″ × 75″ (137 × 190.5 cm) |
135 × 190 cm (4’6″ × 6’3″) |
140 × 200 cm |
~138 × 188 cm |
| Queen |
60″ × 80″ (152 × 203 cm) |
No direct match |
No direct match |
~153 × 203 cm |
| King |
76″ × 80″ (193 × 203 cm) |
150 × 200 cm (5’0″ × 6’6″) |
160 × 200 cm |
~183 × 203 cm |
| Super king |
Cal King 72″ × 84″ (183 × 213 cm) |
180 × 200 cm (6’0″ × 6’6″) |
180 × 200 cm |
~203 × 203 cm |
Read across the “King” row and the problem is obvious. A UK king at 150 × 200 cm is 59″ × 78.7″ — about an inch narrower and an inch shorter than a US queen, and 17 inches narrower than a US king. An Australian queen at roughly 153 × 203 cm is the closest thing to a US queen anywhere on this bed size chart, which is why Australian and American queen bedding sometimes works and British bedding almost never does.
EU 200 cm lengths are 1.2 inches shorter than the US 80-inch standard, so an EU king sheet on a US queen comes up short lengthwise while gaping at the sides. Duvets are more forgiving because they just hang, but a 200 × 200 cm EU duvet on a 193 cm-wide US king leaves almost no overhang. Australian dimensions also shift by a centimetre or two between makers, so read the spec sheet, not the size name.
Sheet, duvet and comforter sizes that match each mattress
Length and width decide which sheet size you buy. Mattress depth decides whether the fitted sheet stays on, and depth is the number nobody checks. Most mattresses run 10 to 14 inches thick, pillow-tops often 15 to 18, and a two-inch topper pushes any of them past a standard pocket.
| Mattress |
Fitted sheet |
Flat sheet (typical) |
Duvet/comforter (typical) |
| Twin 38 × 75 |
Twin |
~66″ × 96″ |
~66–68″ × 86–90″ |
| Twin XL 38 × 80 |
Twin XL (not twin) |
~66″ × 102″ |
~68″ × 90″ |
| Full 54 × 75 |
Full |
~81″ × 96″ |
~80–90″ × 90″ |
| Queen 60 × 80 |
Queen |
~90″ × 102″ |
~88–92″ × 92–98″ |
| King 76 × 80 |
King |
~108″ × 102″ |
~104–110″ × 92–98″ |
| Cal King 72 × 84 |
California King (different from king) |
~108″ × 102″ |
~104–110″ × 96–100″ |
| Split King |
Two Twin XL, or split-top king |
King flat over both |
King |
Bedding measurements vary between brands — treat the above as typical ranges and check the label. Three rules that save returns:
- King and Cal King sheets are not interchangeable. Cal King is four inches longer and four narrower; a king fitted sheet will pull off its corners.
- Measure your mattress depth with a tape, add the topper, then buy a pocket depth at least two inches greater.
- Size the duvet up, not down, if you want real drape over a thick mattress or you share with a cover-stealer.
How to choose your bed size
Work through these in order — the first one that fails narrows the list fast.
- Height. Anyone over about 6’0″ wants an 80-inch mattress; over about 6’2″, look hard at California King’s 84 inches. Length is not negotiable the way width is.
- Who else is in the bed. Two adults: queen minimum. Two adults plus a kid who migrates at 4 a.m., or a big dog: king or split king. One adult who starfishes: a full is often enough.
- Room shape, not just floor area. A long narrow room takes a Cal King gracefully and a king badly; a square room does the opposite.
- The route in. Tight stairs mean bed-in-a-box or a split setup.
- Total cost, not mattress cost. Going up a size means new sheets, duvet, protector, frame and often a new base. Specialty sizes commit you to custom-order bedding for the life of the bed. Prices move constantly, so check two or three sellers the week you buy rather than trusting a figure you read online.
- Different firmness preferences. Split king solves this without a compromise mattress, though you will feel the centre gap unless you use a bridge or split-top sheet.
Does a bigger bed mean better sleep? Honestly, the direct evidence is thin — there is no large controlled study pitting queens against kings. Research on bed sharing does show couples move and wake more together than alone, and extra width is one reasonable answer to that. Good motion isolation and separate duvets are another, and they cost less. Consumer Reports’ mattress buying guide is a neutral place to read up on types and firmness before you commit to a footprint.
What to measure before you buy
- Room, wall to wall — width, length, and ceiling height if a tall headboard is on the list.
- Obstacles — door swings, closet doors, radiators, window sills, vents and outlets you still want to reach.
- The footprint in tape — outline the mattress plus your frame allowance with painter’s tape and live with it for a day. Walk it in the dark.
- Walkways — 24 to 30 inches on the sides you use; under 18 inches becomes a shin bruise.
- Delivery path — narrowest hallway, stair turn, door width with the door removed, lift depth in an apartment.
- Mattress depth — for sheet pockets, and for total bed height (22 to 26 inches from floor to mattress top suits most people).
FAQ
What are the exact dimensions of a king size bed?
76 inches wide by 80 inches long — 193 × 203 cm, or 6’4″ × 6’8″. That is 16 inches wider than a queen and exactly the same length. A California King is different: 72″ × 84″ (183 × 213 cm).
What is the most common bed size?
Queen, 60″ × 80″ — the best-selling US size for years, because it sleeps two, fits a 10′ × 10′ bedroom and has the deepest stock of frames and bedding.
Will a king bed fit in a 12′ × 12′ room?
Yes, comfortably. A 76-inch king in a 144-inch room leaves 34 inches per side before the frame — enough for nightstands and a walkway. It still fits an 11′ × 11′ room, but plan on one side against a wall.
Is a full bed big enough for two adults?
For occasional nights, yes. Every night, usually not — 27 inches each is narrower than a crib mattress. A queen adds three inches per person; a king adds eleven.
What’s the difference between twin and twin XL?
Width is identical at 38 inches. Twin XL is five inches longer (80″ vs 75″), matching queen and king length. Buy Twin XL sheets — a standard twin fitted sheet will not reach.
What is the biggest bed size you can buy?
Alaskan King, 108″ × 108″ (274 × 274 cm), is the largest size sold with any regularity — a nine-foot square. Custom mattresses go further for lofts, RVs and boats, but you will be ordering bedding and a base to match, every time.
Updated September 2026.
