Mattress sizes
Twin Mattress Dimensions
Quick answer
A Twin mattress measures 38 inches wide by 75 inches long (97 by 191 cm), which is 19.8 square feet of sleeping surface. It is sized for one sleeper.
The twin is a standard US mattress size, which means every manufacturer builds it to the same 38 by 75 inch footprint. The numbers that actually decide whether it works in your bedroom are the room it needs and the height it ends up at, both of which are below.
What are the exact twin mattress dimensions?
| Measurement | Inches | Centimetres | Feet |
|---|---|---|---|
| Width | 38 | 97 | 3.2 ft |
| Length | 75 | 191 | 6.3 ft |
| Sleeping area | 2,850 sq in | 18,527 sq cm | 19.8 sq ft |
| Width per sleeper | 38 in | 97 cm | 3.2 ft |
Industry standard
These are standard published dimensions, the same across manufacturers.
How much room does a twin bed need?
Add about 3 inches of frame on each side, then the walking clearance you want. The convention is 24 inches to squeeze past and 30 or more to be comfortable.
| Clearance on each side | Room width needed | Room length needed |
|---|---|---|
| 24 in | 92 in (7.7 ft) | 105 in (8.8 ft) |
| 30 in | 104 in (8.7 ft) | 111 in (9.3 ft) |
| 36 in | 116 in (9.7 ft) | 117 in (9.8 ft) |
Convention, not a standard
This is widely repeated guidance rather than a measured standard. Treat it as a starting point.
Assumes a frame about 3 inches wider than the mattress on each side, clearance on both sides and at the foot, and the headboard against a wall. Check yours with Room Size and Clearance Calculator.
How does a twin compare to other mattress sizes?
| Size | Width (in) | Length (in) | Area (sq ft) | Standard size |
|---|---|---|---|---|
| Twin (this page) | 38 | 75 | 19.8 | Yes |
| Twin XL | 38 | 80 | 21.1 | Yes |
| Full (Double) | 54 | 75 | 28.1 | Yes |
| Full XL | 54 | 80 | 30 | Yes |
| Queen | 60 | 80 | 33.3 | Yes |
| Olympic Queen | 66 | 80 | 36.7 | No |
| Short Queen (RV) | 60 | 75 | 31.3 | No |
Industry standard
These are standard published dimensions, the same across manufacturers.
Which mattresses come in twin?
Every mattress below publishes twin as its size. Prices change often.
Novilla 8 Inch Twin Mattress
$104.998 inch twin memory foam.
Check price on Amazon
EGOHOME 8 Inch Twin Mattress
$109.998 inch twin memory foam, medium firm feel as the maker describes it.
Check price on Amazon
Zinus Memory Foam 8 Inch Green Tea Mattress
$109.998 inch twin memory foam.
Check price on AmazonFrequently asked questions
What are the dimensions of a twin mattress?
A twin mattress measures 38 inches wide by 75 inches long, or 97 by 191 centimetres. That works out to 19.8 square feet of sleeping surface. This is a standard US size, so it is the same from every manufacturer.
How big a room does a twin bed need?
For comfortable movement, allow the mattress plus about 3 inches of frame on each side plus 30 inches of walking clearance. For a twin that means roughly 104 inches of room width and 111 inches of length. You can get away with 24 inches of clearance, but a nightstand will crowd it.
What size sheets fit a twin mattress?
Buy sheets labelled twin. The fitted sheet also has to clear the depth of the mattress, so check the pocket depth separately: standard pockets fit up to 12 inches, deep pockets 13 to 17 inches, and extra deep pockets 18 to 22 inches. A topper adds its full thickness to what the sheet must clear.
Is a twin long enough for a tall person?
A mattress should be about 4 to 6 inches longer than the tallest sleeper. At 75 inches, a twin suits someone up to roughly 71 inches tall, which is 5 feet 11 inches. Above that, look at an 80 inch length such as a queen, king or twin XL.
Does twin refer to thickness as well?
No. Size describes only the width and length. Thickness is separate and ranges from about 6 inches to over 16, with 9 to 12 inches counting as standard. Thickness changes the total height of the bed and the sheet pocket depth you need, but it never changes the 38 by 75 inch footprint.
How to read the numbers on this page. Standard mattress and bedding dimensions are industry-wide and the same across manufacturers. Guidance like replacement intervals, firmness by body weight and walking clearance is convention rather than a measured standard, and every table here says which it is. Where a manufacturer does not publish a figure we leave it out instead of estimating. This is not medical advice: a mattress is not a treatment for a medical condition, and persistent pain is a reason to see a clinician.