Bed Sizes Chart

Updated November 8, 2026 · By Serge, King Size Bed

The six standard US bed sizes are twin (38 x 75 in), twin XL (38 x 80 in), full or double (54 x 75 in), queen (60 x 80 in), king (76 x 80 in) and California king (72 x 84 in). The king is the biggest by surface. Every frame is larger than its mattress: below are the median outside sizes of more than 900 real frames, plus the smallest room it fits in comfortably.

Bed sizes chart

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These are the sizes on mattress labels. The voluntary guideline of the International Sleep Products Association gives slightly smaller figures (for example 60 x 79.5 inches for a queen and 53 x 74.5 for a full) with half an inch of tolerance; labels round them up. So a mattress listed at 60 x 79.5 inches is a queen, and one at 53 x 74.5 inches is a full. A split king is two twin XL mattresses side by side, 76 x 80 inches in total, the same as a king.

Bed frame sizes: what each bed really takes

The mattress size never tells you how much floor the bed needs. Headboards, rails and legs sit outside it. These are the median outside sizes listed for the frames we counted (listings read in September 2026):

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The twin, full, queen and California king figures come from the listings of one US online furniture store, the king figure from 545 frames at US online stores; we found too few twin XL frames to give a figure. Within one size, frames vary a lot: storage beds and bookcase headboards can add 10 inches or more, while a plain platform frame stays close to the mattress. For the headboard alone, size by size, see our headboard sizes chart.

The smallest room for each bed size

We keep at least 24 inches free on each side of the bed and at the foot, our own rule of thumb for a comfortable walkway rather than an official standard. With the median frames above, centered on one wall:

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A twin pushed into a corner needs much less: one side against the wall frees 24 inches or more. Nightstands come out of the side space, so add their width if you want them. For a king, our room size guide and calculator checks any room.

Which bed size for two people?

Split down the middle, a full gives each of two sleepers 27 inches, a queen 30, a California king 36 and a king 38. A twin bed is 38 inches wide for one person, so only the king gives each sleeper the width of a whole twin.

Our view: a full is a bed for one adult. For a couple, a queen is the smallest size we would pick, and the king is the one to choose if either of you moves a lot at night or a child or a pet joins you.

Twin and twin XL

A twin (38 x 75 in) is the bed for one child, a teenager or a guest room. The twin XL is the same width and 5 inches longer, 80 inches, which suits tall teenagers and adults. Two twin XL mattresses side by side make a king. More in our twin XL dimensions guide. Details, frame sizes and room sizes are in our twin bed dimensions guide.

Full (double)

"Full" and "double" are the same bed in the US: 54 x 75 inches. It is 16 inches wider than a twin and the same length, and 6 inches narrower and 5 inches shorter than a queen. See our full size bed dimensions guide. Our full vs queen guide compares a full and a queen in detail.

Queen

The queen measures 60 x 80 inches. In 2000, the industry association counted it as the best-selling US mattress size, with 33.1% of sales. Our queen size bed dimensions guide has the frame sizes, room table and rug sizes.

King and California king

A king size bed is 76 inches wide and 80 inches long: 6 ft 4 in x 6 ft 8 in, or 193 x 203 cm. That is the mattress. With its frame, the median king we counted takes 80 x 86 inches of floor (203 x 218 cm), about 6 ft 8 in x 7 ft 2 in. A California king mattress is 72 x 84 inches (183 x 213 cm), 6 x 7 feet.

The king (76 x 80 in) is 16 inches wider than a queen. The California king (72 x 84 in) trades 4 inches of width for 4 inches of length and is not bigger: its surface is slightly smaller. Our king bed frame dimensions guide and king vs California king guide compare them in detail, and our California king bed dimensions guide has the frame and room sizes for the long king.

What is the biggest bed size?

Among the standard sizes, the king, with 42.2 square feet of sleeping surface; the California king is longer but has 42.0. Some makers sell larger beds outside the industry guideline, such as the Alaskan king at 108 x 108 inches. Sheets, frames and mattresses for those sizes are much harder to find than standard ones, so check availability before you plan a room around one.

Bed sizes in other countries

Names do not travel. A UK double is 135 x 190 cm, a UK king 150 x 200 cm (close to a US queen) and a UK super king 180 x 200 cm, still narrower than a US king at 193 x 203 cm. Shop by the inches or centimeters, not by the name.

Sheets only fit their own size

A fitted sheet is cut for one mattress size plus its thickness: queen sheets will bunch on a full, full sheets will not stretch over a queen, and king and California king sheets are not interchangeable. Buy the size on the mattress label and match the pocket depth to the mattress height. For pillows and pillowcases, see our pillow sizes chart.

Looking for a king? Every one of our king bed frames lists its outside size on its page.

Shop king beds by style

Every bed in these collections lists its outside size on the product page, so you can check it against your room and your mattress before you order.

• All king bed frames
• By build: king platform beds, upholstered king beds, wood king bed frames, king beds with storage and king beds with drawers
• By height: low profile king beds, king floor beds with no gap underneath, king bed frames high off the ground with 10 to 14 inches underneath, and king beds with a tall headboard
• By look: modern, mid-century, rustic, cloud beds, velvet, black, brown, beige, gray, white and cream, wingback, boucle, linen, faux leather, solid wood, canopy, sleigh, rattan, metal, tufted, farmhouse and panel king beds, and king beds with a bookcase headboard
• For a 72 x 84 inch mattress: California king bed frames, including California king platform beds that need no box spring
• A few of our king beds: Burbank cloud bed with side shelves, Biloxi canopy bed, Montauk storage bed with 8 drawers and Fresno wood platform bed

Frame figures: listed outside dimensions of 66 twin, 88 full and 265 queen and 118 California king bed models sold by a US online furniture store, as listed on September 29, 2026; 545 king frames listed by US online furniture stores, read on September 29, 2026; 120 bed models listed in both king and California king, read on September 29, 2026. Mattress sizes: US labels and the dimensional guideline of the International Sleep Products Association.

Planning the floor too? See what size rug goes under a king bed.

Torn between the two most common sizes? Our king vs queen bed comparison has the numbers side by side.

Going up to a king? Here is how much a king size bed costs.

Bed frame sizes: how much frames vary

A median hides the spread. Here is the range of outside sizes for each bed size, from the same frames as the bed frame table above. The middle half is the 50% of frames in the middle: the smallest quarter and the largest quarter are left out.

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Most frames stay close to the median. Three king frames in four (76%) are 82 inches wide or less. Seven queen frames in ten (69%) are 66 inches wide or less. 54 of the 66 twin frames (82%) are 43 inches wide or less. The California king is the exception: only 16 of its 118 frames (14%) are 78 inches wide or less.

The narrowest frames listed hug the mattress: 40.5 inches wide for a twin, 61.75 for a queen, 74.25 for a California king and 76 for a king. The biggest are storage beds with drawers in the footboard, beds with a bookcase headboard and beds with a bench built into the foot. Height is mostly the headboard: for the queen and the California king, the lowest platform frames started at 14.25 inches. Plan with the median, then check the outside size of the exact frame you like.

Same bed, two sizes: what changes on the frame

The cleanest comparison is one bed model sold in two sizes. We matched the models a US online furniture store listed in both sizes and compared their outside dimensions.

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The frame follows the mattress, with one exception. A California king frame is usually as wide as a king frame: on 79 of the 120 models (66%), the width was the same within an inch, and only 34 (28%) were 2.5 to 5 inches narrower. So a California king saves no space on the sides of a room unless the frame itself is narrower. Our king vs California king guide has the details, and our full vs queen bed guide compares the two middle sizes, prices included.

Bed size by room size

Which bed fits which room? Each cell gives the free space around a median frame, in inches: first on each side, then at the foot. The headboard goes on the wall that leaves the most room. Under 24 inches, the bed goes in, but the walkway is tight.

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In this table, the twin and the full fit from 9 x 10 ft, the queen from 10 x 10 ft, and the king and the California king from 10 x 12 ft. The smallest comfortable room for each size is in the room table higher up this page. A twin pushed into a corner needs even less: in a 7 x 9 ft room, it leaves 41 inches on the open side. A twin XL takes the same width as a twin and 5 more inches of the room's length. Nightstands come out of the side space, so a 20-inch nightstand next to a king in a 10 x 12 ft room leaves 12 inches to walk past it.

Each size guide has its own room table: twin bed dimensions, twin XL bed dimensions, full size bed dimensions, queen size bed dimensions and California king bed dimensions. For a king, see our king bed frame dimensions guide.

How to measure your room

All you need is a tape measure and the outside size of the frame. Measure in inches, at floor level.

1. Measure the headboard wall. Wall to wall, along the floor. Note any door, window, closet or radiator on it, and check which way the door swings.
2. Measure the depth. From the headboard wall to the opposite wall. If a dresser will face the foot of the bed, take off its depth and the space to pull its drawers out.
3. Get the outside size of the frame. Use the width and length of the frame, not of the mattress. If a listing only says "king", ask for the outside width and length. No frame chosen yet? Use the medians in the tables above.
4. Do the math. Wall minus frame width, divided by two, is the space on each side. Depth minus frame length is the space at the foot. Example: a median king frame (80 x 86 in) on the 12-foot wall of a 10 x 12 ft room leaves (144 - 80) / 2 = 32 inches on each side and 120 - 86 = 34 inches at the foot.
5. Compare with 24 inches. We keep at least 24 inches on each side and at the foot, and 30 inches feels roomy. That is our rule of thumb, not an official standard.
6. Take off the nightstands. Subtract their width from the side space. A 20-inch nightstand on each side of that king leaves 12 inches to walk past it.
7. Try the other wall. The same king on the 10-foot wall leaves 20 inches on each side and 58 at the foot. The longer wall usually wins, unless it has the door, the closet or a window you want to keep clear.
8. Check the ceiling and the way in. For a canopy bed, measure the ceiling: our king canopy beds stand 68.9 to 88 inches tall. Then measure the narrowest door and the stairwell turn. Frames ship flat in boxes; the mattress is the bulky part, and one delivered rolled in a box is much easier to carry in.

Want to see it before you order? Mark the outside size of the frame on the floor with tape and walk around it. For a king, our will a king bed fit my room guide has a calculator that tries both walls, and printable layouts at 1/2 inch = 1 foot.

How we measured

Our frame and room figures come from the sizes sellers list, not from a showroom tape measure. Here is what we read, and when.

• Mattress sizes: the sizes on US labels. The voluntary guideline of the International Sleep Products Association lists slightly smaller figures, with half an inch of tolerance either way: twin 38 x 74.5 in, twin XL 38 x 79.5 in, full 53 x 74.5 in, queen 60 x 79.5 in, king 76 x 79.5 in and California king 72 x 83.5 in. Labels round the lengths to 75, 80 and 84 inches, and the full to 54 x 75.
• Twin, full, queen and California king frames: listed outside dimensions and heights of 66 twin, 88 full, 265 queen and 118 California king bed models sold by a US online furniture store, as listed on September 29, 2026. One figure per distinct model. Bunk, loft, daybed and trundle listings were left out of the twin and full counts, and listings with impossible or contradictory sizes out of the queen count.
• King frames: listed outside sizes of 545 king bed frames at US online furniture stores, read on September 29, 2026. Listings with missing or contradictory width and length labels were left out.
• Same bed in two sizes: 65 twin and full, 86 full and queen, 246 queen and king, and 120 king and California king models, read between September 29 and October 11, 2026.
• Twin XL frames: too few listings gave a size, so we publish no median. The frame of about 42 x 85 inches in our twin XL guide is our estimate.
• Rooms: the median frame plus 24 inches of walkway on each side and at the foot, our rule of thumb rather than an official standard, with the headboard on the wall that leaves the most room.
• Our calculation: surfaces, feet, centimeters and meters, the free space in each room (rounded to the inch) and the room cells that are not in the size guides.

Tables, measuring steps and method added on November 11, 2026.

King Size Bed team

Buying a mattress or a frame from Europe? Our chart of European bed sizes converts each centimeter size to inches and gives the gap to the nearest US size.