Twin XL dimensions: 80 in long, 38 or 39 in wide, 36 in in some dorms
Twin XL dimensions: 80 in long (203.2 cm, 6 ft 8 in) and, depending on the source, 38 or 39 in wide (96.5 or 99.1 cm). Target prints 39 × 80 in; Sleep Foundation, Casper, Bed in a Box and Tampa Mattress print 38 × 80 in. College housing prints a third width: Duke and UCLA list their Twin XL mattresses at 36 × 80 in. A Twin XL is 5 in longer than a 75 in Twin and no wider.
What we found
A dorm Twin XL can be 2 to 3 inches narrower than the one in the shop
Duke's housing page says most of its mattresses are extra-long twin, "approximately 80 inches long x 36 inches wide x 7 inches deep", and tells residents in those halls to bring extra-long twin sheets. UCLA's undergraduate apartments give the same 36 × 80 in. Retail charts put the width at 38 or 39 in. North Dakota State goes further: its Residence Life office recommends extra-long twin sheets for every hall because that size fits any mattress on campus. Check your school's housing page for the mattress size before you buy a topper or a protector cut to a retail Twin XL.
Housing pages read on 15 October 2026.
Twin XL width by source
| Source | Type | Width × length |
|---|---|---|
| Target | Retailer chart | 39 × 80 in |
| Sleep Foundation | Editorial guide | 38 × 80 in |
| Casper | Mattress maker | 38 × 80 in |
| Bed in a Box | Mattress seller | 38 × 80 in |
| Tampa Mattress | Mattress retailer | 38 × 80 in |
| Duke housing | University housing | 36 × 80 in, about 7 in deep |
| UCLA housing (undergraduate apartments) | University housing | 36 × 80 in |
Retail sources read 15 October 2026 (Target and Sleep Foundation checked 24 September 2026). The 80 in length is the same everywhere; only the width changes. We keep each figure and do not average them to a width no source prints.
| Measure | Twin XL (Target) | Dorm Twin XL (Duke) | Change |
|---|---|---|---|
| Width | 39 in99.1 cm | 36 in91.4 cm | −3 in−7.7 cm |
| Length | 80 in203.2 cm | 80 in203.2 cm | ±0 in±0.0 cm |
| Area | 3,120 sq in21.7 sq ft | 2,880 sq in20.0 sq ft | −240 sq in−7.7% |
| Area (m²) | 2.01 m² | 1.86 m² | −0.15 m² |
Twin XL size in inches, cm, feet and metres
| Unit | Width | Length | Source |
|---|---|---|---|
| Inches | 39 in | 80 in | Target |
| Inches, second source | 38 in | 80 in | Sleep Foundation |
| Centimetres | 99.1 cm | 203.2 cm | Our conversion |
| Feet and inches | 3 ft 3 in | 6 ft 8 in | Our conversion |
| Metres | 0.991 m | 2.032 m | Our conversion |
First row: Target mattress size chart; second row: Sleep Foundation twin guide, both checked 2026-09-24. The other rows convert Target's figure, rounded as shown; at 38 in the width is 96.5 cm, 3 ft 2 in or 0.965 m, and at 36 in it is 91.4 cm, 3 ft or 0.914 m.
Room size for a Twin XL bed
With a 30 in walkway on the open side and at the foot, a Twin XL against one wall needs floor space of about 5 ft 9 in × 9 ft 2 in; with walkways on both sides, 8 ft 3 in × 9 ft 2 in.
| Layout | Mattress only (39 × 80 in) |
|---|---|
| Walkway on both sides and at the foot30 in (76 cm) on both long sides and at the foot | 8 ft 3 in × 9 ft 2 in2.52 m × 2.79 m, 7.03 m² (75.6 sq ft) |
| One long side against a wall30 in (76 cm) on one long side and at the foot | 5 ft 9 in × 9 ft 2 in1.75 m × 2.79 m, 4.90 m² (52.7 sq ft) |
Walkway: Which? says to aim for at least 2ft 6in (76 cm) between the sides and foot of the bed and the nearest wall or furniture; the 2010 ADA Standards (305.3 and 806.2.3) require a clear floor space 30 in wide on both sides of a bed in accessible hotel rooms. Both were read on 2026-09-25. We work out each room size by adding 30 in to the bed width for each open side and 30 in to its length at the foot. The headboard wall needs no walkway. Allow extra space for bedside tables, door swings and a wardrobe.
Who a Twin XL fits
- Length. The National Bed Federation says a bed should be 4 to 6 in (10 to 15 cm) longer than the tallest person in it. At 203.2 cm (6 ft 8 in), that puts the tallest comfortable sleeper at about 188 to 193 cm (6 ft 2 in to 6 ft 4 in).
- Width. A one-person size: the sleeper gets the full 39 in (38 in on Sleep Foundation's figure). Two people sharing would get 19.5 in each (19 in on the 38 in figure).
A Twin XL gives a taller sleeper 5 in more length than a Twin without making the bed any wider. For the 5 in difference drawn to scale, see Twin vs Twin XL.
Sheets, comforters and toppers for a Twin XL
| Item | Size | What it means for this bed |
|---|---|---|
| Fitted sheet | 39 × 80 in | Sold under the same size name as the mattress. Check the mattress's stated size and the pocket depth. See fitted sheet pocket depth. |
| Comforter | 68 × 86 to 90 in | Hangs 14.5 in over each side of a 39 in mattress (15 in on a 38 in one). A side is covered only if the overhang is at least the mattress depth. |
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Comforter range: Sleep Foundation, read 2026-09-25. A Twin fitted sheet is cut for a 75 in mattress, so it is 5 in short for an 80 in one. Duke says to bring extra-long twin sheets for its 36 × 80 in mattresses.
The Twin XL in other countries
| Market and name | Size | Compared with the Twin XL |
|---|---|---|
| French Single 90 × 200 | 90 × 200 cm35.4 × 78.7 in | 9.1 cm (3.6 in) narrower, 3.2 cm (1.3 in) shorter |
| UK Euro Single | 90 × 200 cm35.4 × 78.7 in | 9.1 cm (3.6 in) narrower, 3.2 cm (1.3 in) shorter |
| French Single 90 × 190 | 90 × 190 cm35.4 × 74.8 in | 9.1 cm (3.6 in) narrower, 13.2 cm (5.2 in) shorter |
Common questions
What size are dorm beds?
It depends on the school and the hall. Duke says most of its mattresses are Twin XL at 36 × 80 in, two halls have a regular twin and three have 54 × 75 in mattresses. NDSU says every hall except two has an 80 in long twin. Ask housing for the exact mattress size.
What sheets fit a dorm Twin XL?
Duke tells residents of its 36 × 80 in halls to bring "extra-long" twin sheets. NDSU recommends extra-long twin sheets in every hall, because that size fits any mattress on campus and survives a move to another hall.
Do two Twin XLs make a King?
Two 38 in Twin XLs make 76 × 80 in, the same as a King. Two 39 in ones make 78 in, 2 in wider; two 36 in dorm mattresses make 72 in. See King size bed dimensions.
Will a Twin XL mattress fit a Twin frame?
A frame made for a 75 in mattress is 5 in too short for an 80 in one. Check the frame maker's stated mattress length; bed frame dimensions shows how makers publish it.
Sources
- Target mattress size chart
- Sleep Foundation twin size guide
- Casper: Mattress Sizes and Bed Dimensions Guide
- Bed in a Box: Mattress Size Guide
- Tampa Mattress: Mattress Size Chart
- Duke Housing & Residence Life: Beds and Mattresses
- UCLA Housing: Undergraduate University Apartments bed sizes
- NDSU Residence Life: Beds, Lofts & Linens
- Which? UK bed, sheet and duvet size guide
- 2010 ADA Standards for Accessible Design (305.3, 806.2.3)
Retail and housing pages were read on 15 October 2026; every width is printed as the source gives it.