PickGlobeBed and mattress size chart
Pick a size to see it in inches and centimetres, the closest match in the other systems, and whether it fits your room.
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- US sizes are in inches (Queen is 60 x 80 in); UK and European sizes are in centimetres (King is 150 x 200 cm).
- European sizes are usually 10 cm longer: a UK mattress will not fit a frame built for a European size.
- Leave about 2 ft 6 in (76 cm) clear beside and at the foot of the bed.
How we calculate
Each size is the mattress size published by the sources under "The sizes we use". US sizes are in inches, UK and European sizes in centimetres; we convert with 1 in = 2.54 cm.
- Closest size. For the size you pick we find the size in each other system with the smallest total difference in width and length, and show the gap.
- Fits your room. Which? advises leaving about 2 ft 6 in (76 cm) between the sides and foot of the bed and the nearest wall or furniture. We assume the head is against a wall, so the room needs the bed width plus 76 cm each side and the bed length plus 76 cm at the foot.
- Differences. Makers differ by a fraction of an inch in the US, and there is no standard mattress depth.
The sizes we use
| Item | Rule |
|---|---|
| Twin | 38 x 75 in (Casper); 38 x 74.5 in (Serta) |
| Twin XL | 38 x 80 in (Casper); 38 x 79.5 in (Serta) |
| Full (double) | 53 x 75 in (Casper); 53 x 74.5 in (Serta) |
| Queen | 60 x 80 in (Casper); 60 x 79.5 in (Serta) |
| King | 76 x 80 in (Casper); 76 x 79.5 in (Serta) |
| California King | 72 x 84 in (Casper); 72 x 83.5 in (Serta) |
There is no legal standard: sizes can differ by about half an inch between makers, and mattress height varies by model.
Checked on 27 October 2026.
| Item | Rule |
|---|---|
| Small single | 75 x 190 cm (2 ft 6 in x 6 ft 3 in) |
| Single | 90 x 190 cm (3 ft x 6 ft 3 in) |
| Euro single | 90 x 200 cm (3 ft x 6 ft 6 in), European size |
| Small double (queen) | 120 x 190 cm (4 ft x 6 ft 3 in) |
| Double | 135 x 190 cm (4 ft 6 in x 6 ft 3 in) |
| Euro double | 140 x 200 cm (4 ft 7 in x 6 ft 6 in), European size |
| King | 150 x 200 cm (5 ft x 6 ft 6 in) |
| Euro king | 160 x 200 cm (about 5.3 ft x 6 ft 6 in), European size |
| Super king | 180 x 200 cm (6 ft x 6 ft 6 in) |
| Emperor | 200 x 200 cm (6 ft 6 in x 6 ft 6 in) |
There is no standard mattress depth. A UK mattress on a bed built for a European size will be too small.
Checked on 27 October 2026.
| Item | Rule |
|---|---|
| 80 x 200 | 80 x 200 cm |
| 90 x 200 | 90 x 200 cm |
| 140 x 200 | 140 x 200 cm |
| 160 x 200 | 160 x 200 cm |
| 180 x 200 | 180 x 200 cm |
These are the sizes IKEA Switzerland lists; other makers and countries may differ. IKEA Ireland sells only UK sizes.
Checked on 27 October 2026.
Sources and last checked
- US mattress sizes (inches), checked 27 October 2026: Casper: mattress size guide; Serta: mattress sizes and dimensions
- UK and European-size mattresses (cm), checked 27 October 2026: Which?: UK bed sizes, bed and mattress size guide (7 May 2026); IKEA Ireland: mattress size guide
- Continental mattress sizes sold by IKEA (cm), checked 27 October 2026: IKEA Switzerland: mattresses (size filter)
Sizes are the makers' and Which?'s published figures and can differ by a little between brands; mattress depth varies. Check the exact size on the product page before you buy a frame or sheets.