Double Bed Dimensions: Mattress, Frame and Room
Updated November 11, 2026 · By Serge, King Size Bed
In short: double bed dimensions are 54 x 75 inches (137 x 191 cm) for the mattress, the size US stores call a full; with its frame, a full bed takes about 57 x 80 inches.
A full size bed, also called a double, takes a standard US mattress of 54 x 75 inches (137 x 191 cm), 4 feet 6 inches wide and 6 feet 3 inches long. With its frame it takes more space: across 88 full bed frames listed by a US online furniture store, the median outside size was 57.1 x 80.25 inches.
Full mattress dimensions
| Measurement | Inches | Feet | Centimeters |
|---|---|---|---|
| Width | 54 in | 4 ft 6 in | 137 cm |
| Length | 75 in | 6 ft 3 in | 191 cm |
| Sleeping surface | 4,050 sq in | 28.1 sq ft | 2.61 m² |
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The voluntary guideline of the International Sleep Products Association lists the full, which it calls "Full/Double", at 53 x 74.5 inches with half an inch of tolerance, and a "Double XL" at 53 x 79.5. Labels round the full to 54 x 75. Thickness is not part of the size.
"Full" and "double" are two names for the same bed in the US.
Full bed frame dimensions
We read the listed outside dimensions of 88 full bed models sold by a US online furniture store (September 2026; bunk beds, loft beds, daybeds and trundles left out):
| Outside size of the frame | Width | Length |
|---|---|---|
| Middle half of the frames | 56.5 to 58 in | 79.1 to 83.9 in |
| Median | 57.1 in | 80.25 in |
| Largest listed | 64.25 in | 92 in |
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Eight in ten frames (70 of 88) were 58 inches wide or less, and 68 of 88 were 84 inches long or less. The biggest are sleigh beds, padded panel beds and storage beds with a bookcase headboard. The median listed height was 52.6 inches, mostly the headboard; the middle half ranged from 49.1 to 54 inches.
In feet and centimeters, the median frame is about 4 ft 9 in by 6 ft 8 in, or 145 x 204 cm.
A mattress smaller than its frame has room to move, which is one reason a mattress keeps sliding.
Full vs queen vs twin
| Size | Mattress | Median frame in the same store's listings | Width per sleeper (two adults) |
|---|---|---|---|
| Twin | 38 x 75 in | 42.1 x 80.4 in (66 models) | one sleeper |
| Full (double) | 54 x 75 in | 57.1 x 80.25 in (88 models) | 27 in |
| Queen | 60 x 80 in | 64.5 x 87 in (265 models) | 30 in |
| King | 76 x 80 in | 80.7 x 87 in (309 models) | 38 in |
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A queen is 6 inches wider and 5 inches longer than a full. Our full vs queen guide compares prices, room sizes and bedding too. For the same bed sold in both sizes (86 models in the store's listings), the queen frame was 6.5 inches wider and 5 inches longer at the median. Going the other way, a full is 16 inches wider than a twin: in 65 models sold in both, the full frame was 15 inches wider and, in 58 of them, exactly as long. Our queen size bed dimensions guide and twin bed dimensions guide cover those two sizes, and our bed sizes chart lists all six.
A UK double is 54 x 75 in, the same as a US full, while the continental double, 140 x 200 cm, is 1.1 in wider and 3.7 in longer. Both sit in our European bed sizes chart.
Is a full bed big enough for two people?
Split in two, a full gives each sleeper 27 inches. That is 11 inches less than a twin gives one person, and 3 inches less per person than a queen.
Our view: a full is a bed for one adult, a teenager or a guest room. Two adults can share it, but at 27 inches each there is no room to turn without touching. For a couple, a queen is the smallest size we would choose, and a king gives each sleeper 38 inches.
Can a queen mattress fit on a full frame?
No. A queen mattress is 60 x 80 inches; a full frame is built for 54 x 75. The mattress would hang 3 inches over each side and 5 inches past the foot, with nothing under the edges. Moving up to a queen means a queen frame too.
How big a room do you need for a full bed?
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.
With the median full frame of 57.1 x 80.25 inches:
| Room | Placement | Free space | Space at the foot | Verdict |
|---|---|---|---|---|
| 7 x 10 ft | in a corner, along a wall | 26 in on the open side | 39 in | fits |
| 8 x 10 ft | centered on the 8 ft wall | 19 in each side | 39 in | tight |
| 9 x 10 ft | centered on the 9 ft wall | 25 in each side | 39 in | fits |
| 10 x 10 ft | centered | 31 in each side | 39 in | fits with nightstands |
| 10 x 12 ft | centered on the 12 ft wall | 43 in each side | 39 in | comfortable |
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What size rug for a full bed?
With the median 57.1-inch frame centered on the rug:
| Rug | Placed | Rug showing on each side of the bed |
|---|---|---|
| 5 x 8 ft | 8 ft side across the bed | about 19 in |
| 6 x 9 ft | 9 ft side across the bed | about 25 in |
| 8 x 10 ft | 10 ft side across the bed | about 31 in |
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A 5 x 8 rug with its 5-foot side across the bed is barely wider than the frame. For a king, see what size rug for a king bed.
Sheets and bedding for a full
- Sheets: buy "full". Queen sheets are 6 inches too wide and 5 too long and will bunch; twin sheets are far too small.
- Pocket depth: a fitted sheet is cut for the 54 x 75 top plus the mattress thickness, so match it to the height of your mattress.
- Comforters: many are sold as "full/queen" and hang lower on a full than on a queen. Read the measurements before you buy.
To match the pocket depth, measure first: our mattress thickness guide shows how, and which sizes US stores list most.
Three-quarter and full XL: the sizes on either side of a full
Two rarer US sizes sit next to the full and are easy to confuse with it in a listing, so check the inches:
| Size | Mattress | Centimeters | Against a full of 54 x 75 in |
|---|---|---|---|
| Three-quarter (3/4) | 48 x 75 in | 122 x 191 cm | 6 in narrower, same length |
| Full, or double | 54 x 75 in | 137 x 191 cm | reference size |
| Full XL | 54 x 80 in | 137 x 203 cm | same width, 5 in longer |
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Put a standard full mattress on a three-quarter frame and it overhangs by 6 inches; on a full XL frame it leaves a 5-inch gap at the foot. Sheets do not cross over either: a full XL needs its own fitted sheet, just as a twin XL does. Three-quarter frames turn up mostly among older and antique beds, so measure between the rails before you shop for a mattress.
Double bed sizes in other countries
In the US "double" is just another word for full, but in Britain and Europe it names other beds. How the nearest sizes compare with a US double of 54 x 75 inches:
| Country | Name | Centimeters | Inches | Against a US double |
|---|---|---|---|---|
| United States, Canada | Full or double | 137 x 191 cm | 54 x 75 in | same |
| United Kingdom | Double | 135 x 190 cm | 53.1 x 74.8 in | under 1 in narrower |
| United Kingdom | Small double | 120 x 190 cm | 47.2 x 74.8 in | about 7 in narrower, close to a US three-quarter |
| Continental Europe | 140 x 190 or 140 x 200 | 140 x 190 or 140 x 200 cm | 55.1 x 74.8 or 55.1 x 78.7 in | 1 in wider; the 200 cm one is almost 4 in longer |
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A UK double mattress therefore drops onto a US full frame with less than an inch to spare across, while a 140 x 200 cm European mattress is too long for it. Buy sheets for the size printed on the mattress label, not for the word "double". Our bed size chart puts the full size bed dimensions next to the five other US sizes.
Moving up from a full
If the full feels small for two, the next step is a queen (6 inches wider) and the one after is a king, 22 inches wider than a full. Our king size bed dimensions guide has room sizes for a king, and every one of our king size bed frames lists its outside size.
Going straight to a king? Our king size bed shop has platform, upholstered, wood and storage frames, plus California kings.
Frame figures: listed outside dimensions and heights of 88 full bed models, and of the twin, queen and king versions listed alongside them, sold by a US online furniture store, as listed on September 29, 2026 (one figure per distinct model; bunk, loft, daybed and trundle listings left out). Mattress sizes: the dimensional guideline of the International Sleep Products Association.
Five inches longer than a twin: twin XL bed dimensions.
A full bed takes the same nightstand height as any other size whose mattress top sits at the same level.
Jumping straight to a king? First measure your room for a king bed, using the wall you will really use and the door that opens onto it.
Full size bed dimensions: questions people ask
How big is a full size bed?
54 x 75 inches (137 x 191 cm) for the mattress, about 28.1 square feet. The median frame in our sample measured 57.1 x 80.25 inches.
How wide is a full size bed?
54 inches (4 ft 6 in) for the mattress; the median frame was 57.1 inches wide.
How long is a full size bed?
75 inches (6 ft 3 in, 191 cm) for the mattress, about 80.25 inches for the median frame.
Is a double bed the same as a full?
Yes. In the US, "double" and "full" are two names for the same 54 x 75 inch bed.
How many feet is a full size bed?
4 feet 6 inches by 6 feet 3 inches.
What size is a full bed in centimeters?
137 x 191 cm for the mattress, about 145 x 204 cm for the median frame.
Is a full bed big enough for two people?
It gives each of two sleepers 27 inches, while a twin alone is 38 inches wide. It works for one adult; couples are better on a queen or a king.
Can a queen mattress fit on a full bed frame?
No. A queen is 6 inches wider and 5 inches longer; it would overhang the frame on three sides.
What size rug for a full size bed?
With a median 57.1-inch frame, a 6 x 9 rug with its 9-foot side across the bed shows about 25 inches on each side; a 5 x 8 placed the same way shows about 19.
Can a full bed fit in a 10x10 room?
Yes: a median frame leaves 31 inches on each side and 39 inches at the foot.