King Size Bed Frame Dimensions
Updated November 8, 2026 · By Serge, King Size Bed
A US king mattress measures 76 x 80 inches (193 x 203 cm), about 6 ft 4 in wide and 6 ft 8 in long. The bed frame around it is bigger: across 545 king frames listed by US online stores, the median frame was 80 inches wide and 86 inches long, so plan for roughly 4 extra inches of width and 6 of length.
This page is about the frame: the outside size that has to fit your room, your doorway and the space between your nightstands. For the mattress sizes of every US bed, see our king size bed dimensions chart; for the width next to a queen, in feet and centimeters, see how wide a king size bed is.
How big is a king size bed? Dimensions in feet, inches and cm
| Measurement | Inches | Feet | Centimeters |
|---|---|---|---|
| Width | 76 in | 6 ft 4 in | 193 cm |
| Length | 80 in | 6 ft 8 in | 203 cm |
| Sleeping surface | 6,080 sq in | 42.2 sq ft | 3.92 m² |
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The mattress industry's voluntary guideline, published by the International Sleep Products Association, lists the king at 76 x 79.5 inches and allows about half an inch either way. Stores and makers round the length to 80 inches, which is the figure you will see on almost every label. Mattress thickness is not part of the size: a king can be 8 inches thick or 16, and the name stays the same.
An "Eastern king" is the same bed. The word only exists to tell it apart from the California king.
King bed frame dimensions: what the frame really takes
The number people forget is the frame. Headboards, footboards, side rails and wide legs all sit outside the mattress, and that outside size is what has to fit through your door and between your nightstands.
We read the listed outside dimensions of 545 king frames sold online in the US (September 2026):
| Outside size of the frame | Width | Length |
|---|---|---|
| Smallest listed | 76 in | 80 in |
| Middle half of the frames | 79.2 to 82 in | 84 to 88.9 in |
| Median | 80 in | 86 in |
| Largest listed | 95 in | 105 in |
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Three out of four frames (76%) are 82 inches wide or less. The longest ones in the list, up to 105 inches, are round beds, beds with a storage bench or drawers built into the foot, and beds with a TV lift in the footboard. A plain platform frame can match the mattress almost exactly. In centimeters, the median frame is about 203 x 218 cm, against 193 x 203 cm for the mattress.
How tall is a king size bed?
Height depends on the style far more than on the size. The median listed height was 52 inches, which is mostly the headboard. Platform frames without a headboard can be under 15 inches. Among ours, the Tulsa, with no headboard, stands 10.6 inches tall and the Kennebunk four poster 74.8 inches and the Camden canopy bed 88 inches. Our king canopy beds stand 68.9 to 88 inches tall, so measure the ceiling first: the Mystic, a tufted upholstered canopy bed, reaches 87.4 inches. Our bed height guide shows where the top of the mattress sits on a typical frame: 22 to 25 inches. If your frame needs a box spring, add its height on top of the rails: our box spring guide gives the usual heights.
Our advice: measure the frame, not the mattress. If a listing only says "king", ask for the outside width and length before you order. Every king bed frame we sell shows both on its page.
King vs California king vs split king
| Size | Mattress | Surface | Who it suits |
|---|---|---|---|
| King (Eastern king) | 76 x 80 in | 42.2 sq ft | two adults who want the widest standard bed |
| California king | 72 x 84 in | 42.0 sq ft | tall sleepers, narrow and long rooms |
| Split king | 2 x (38 x 80 in) | 42.2 sq ft | adjustable bases, couples with different firmness |
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The California king is not bigger. It trades 4 inches of width for 4 inches of length, and its surface is slightly smaller. The same industry guideline lists it at 72 x 83.5 inches; it is sold as 72 x 84. Sheets and most frames are not interchangeable between the two: our king vs California king guide compares frame sizes, room sizes and prices, and our California king bed dimensions guide covers the long king on its own. A split king is a standard king cut in two long halves (two twin XL mattresses), so it fits a regular king frame; it takes two twin XL fitted sheets under a king flat sheet.
Comparing with a queen instead? See our king vs queen bed guide, or our queen size bed dimensions guide for the queen on its own. Every US size is side by side in our bed sizes chart.
How much bigger is a king than a queen?
| Size | Mattress | Width per sleeper (two adults) |
|---|---|---|
| Queen | 60 x 80 in (152 x 203 cm) | 30 in |
| King | 76 x 80 in (193 x 203 cm) | 38 in |
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A king is 16 inches wider than a queen and exactly as long. Each of two sleepers gets 38 inches, as much as a whole twin bed, against 30 inches on a queen. The frames follow the mattress: in the listings of a US online furniture store, 246 bed models were sold in both queen and king, and the king version was 16 inches wider at the median; 224 of the 246 had exactly the same length. Our king vs queen bed guide compares prices and room sizes.
Is a king bed two twins?
Not quite. Two twin mattresses side by side measure 76 x 75 inches: as wide as a king but 5 inches shorter. Two twin XL mattresses measure 76 x 80 inches, exactly a king; that pair is what stores sell as a split king, and it fits a regular king frame. Our twin bed dimensions guide has both sizes.
How big a room do you need for a king bed?
Start from the frame, not the mattress, then add the space you need to walk around it. We use 24 inches as the smallest comfortable walkway on each side and at the foot; that is our rule of thumb, not an official standard, and 30 inches feels roomy.
With a median king frame of 80 x 86 inches, headboard against the longer wall when that leaves more room:
| Room (bed wall) | Space each side | Space at the foot | Verdict |
|---|---|---|---|
| 10 x 10 ft (10 ft wall) | 20 in | 34 in | tight: no room for standard nightstands |
| 10 x 12 ft (12 ft wall) | 32 in | 34 in | fits |
| 11 x 12 ft (12 ft wall) | 32 in | 46 in | fits |
| 12 x 12 ft (12 ft wall) | 32 in | 58 in | comfortable |
| 12 x 14 ft (14 ft wall) | 44 in | 58 in | comfortable, room for a dresser |
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Nightstands come out of the side space: a 20-inch nightstand on each side of a 10 x 12 room still leaves 12 inches to walk past, so pick narrow ones or wall shelves in small rooms.
The room check at the end of this guide does the same math with your room and the frame you are looking at. Our king bed room size guide goes further: rooms from 9 x 10 to 14 x 16 feet, nightstands and which wall to use.
What size rug for a king bed?
The same frame math works for a rug. With the median 80-inch frame centered on it:
| Rug | Placed | Rug showing on each side of the bed |
|---|---|---|
| 8 x 10 ft | 10 ft side across the bed | about 20 in |
| 9 x 12 ft | 12 ft side across the bed | about 32 in |
| 10 x 14 ft | 14 ft side across the bed | about 44 in |
| 8 x 10 ft | 8 ft side across the bed | about 8 in |
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How much rug you want to see is a matter of taste. We like at least 18 inches on each side, so a 9 x 12 rug with its long side across the bed is our pick for a king; an 8 x 10 works in a smaller room. Our rug size guide for a king bed adds room sizes and the real sizes of rugs sold as 8 x 10.
King size in other countries
Size names do not travel. A UK king is 150 x 200 cm (about 59 x 79 in), close to a US queen, and a UK super king is 180 x 200 cm (about 71 x 79 in), still narrower than a US king at 193 x 203 cm. Buy sheets and frames by the inches or centimeters, not by the name.
Will a king bed fit through the door?
Check the path in, too. A king frame ships flat in boxes. The mattress is the bulky part: a flat 76 x 80 inch mattress has to turn through doors and stairwells, and one delivered rolled in a box is much easier to carry in.
Sheets, comforters and headboards for a king
- Sheets: buy "king". A fitted sheet is sized for the 76 x 80 top plus the thickness of the mattress, so match the pocket depth to your mattress height.
- Comforters: king comforters are cut larger than the mattress so they drape over the sides. Sizes vary by brand, so check the comforter's own measurements before you buy. Our king size bedding dimensions guide compares the sizes of 19 US brands.
- Headboards: a king headboard has to be at least 76 inches wide to cover the mattress. It attaches to the frame or to the wall, so check that the mounting holes of the headboard and the frame line up before buying them separately. Our headboard sizes guide gives the widths and heights for every bed size.
Every king bed frame we sell lists its outside size from the maker, so you can run the same check before you order. Size is one of eight checks in our guide on how to choose a bed frame.
Shop king beds by style
Every bed in these collections lists its outside size on the product page, so you can check it against the figures in this guide before you order.
- All king bed frames
- By build: king platform beds, upholstered king beds, wood king bed frames and king beds with storage
- 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 and metal king beds
- For a 72 x 84 inch mattress: California king bed frames
- 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 545 king bed frames listed by US online furniture stores, read on September 29, 2026. Listings with missing or contradictory width and length labels were left out. Queen and king versions of the same beds: 246 models sold in both sizes by a US online furniture store, read on October 11, 2026.
Room check
Will a king bed fit your room?
King, California king and queen, to scale
Mattress sizes in inches. A frame adds a few inches on each side.
Quick room check
Enter your room in feet and the outside size of the frame you like. 24 in of walkway is our rule of thumb, not an official standard.
King size bed dimensions: questions people ask
Is 76 x 80 king size?
Yes. 76 x 80 inches is the standard US king mattress. The industry guideline lists 76 x 79.5 inches; labels round it to 80.
Is a king bed 60 by 80?
No. 60 x 80 inches is a queen. A king is 16 inches wider, 76 x 80.
How wide is a king size bed frame?
Wider than the mattress. Across 545 listed king frames, the median outside width was 80 inches, and three out of four were 82 inches or less.
How long is a king size bed?
The mattress is 80 inches (6 ft 8 in). With the frame, count about 86 inches, the median of the 545 listed frames.
Can a 12x12 room fit a king size bed?
Yes. With a median frame against one 12-foot wall, you keep 32 inches on each side and 58 inches at the foot.
Is a king bed too big for a 10x12 room?
No, if the headboard goes on the 12-foot wall: that leaves 32 inches on each side and 34 at the foot. Use narrow nightstands.
Can a king bed fit in an 11x12 room?
Yes: 32 inches on each side and 46 inches at the foot with the headboard on the 12-foot wall.
What size is an Eastern king?
The same as a standard king: 76 x 80 inches. The name only exists to tell it apart from the California king, which is 72 x 84.
Is a California king bigger than a king?
No. It is 4 inches longer but 4 inches narrower, and its surface is slightly smaller (72 x 84 against 76 x 80).
How big should a headboard be for a king size bed?
At least 76 inches wide, the width of the mattress. The frames in our list, headboard included, measured 80 inches wide at the median.