Mattress sizes
Split King Mattress Dimensions
Quick answer
A Split King mattress measures 76 inches wide by 80 inches long (193 by 203 cm), which is 42.2 square feet of sleeping surface. Shared by two people that is 38 inches each.
The split king is a standard US mattress size, which means every manufacturer builds it to the same 76 by 80 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 split king mattress dimensions?
| Measurement | Inches | Centimetres | Feet |
|---|---|---|---|
| Width | 76 | 193 | 6.3 ft |
| Length | 80 | 203 | 6.7 ft |
| Sleeping area | 6,080 sq in | 39,179 sq cm | 42.2 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 split king 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 | 130 in (10.8 ft) | 110 in (9.2 ft) |
| 30 in | 142 in (11.8 ft) | 116 in (9.7 ft) |
| 36 in | 154 in (12.8 ft) | 122 in (10.2 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 split king compare to other mattress sizes?
| Size | Width (in) | Length (in) | Area (sq ft) | Standard size |
|---|---|---|---|---|
| Split King (this page) | 76 | 80 | 42.2 | Yes |
| Twin | 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 |
Industry standard
These are standard published dimensions, the same across manufacturers.
Which mattresses come in split king?
We do not currently list a mattress that publishes split king as its size, which is normal for a size this uncommon. The mattresses below are the ones we do list, in other sizes. Check the size on the product page before ordering, and expect a split king to need a specialty retailer.
Novilla Twin XL Mattress
$96.998 inch twin xl memory foam.
Check price on Amazon
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 AmazonFrequently asked questions
What are the dimensions of a split king mattress?
A split king mattress measures 76 inches wide by 80 inches long, or 193 by 203 centimetres. That works out to 42.2 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 split king 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 split king that means roughly 142 inches of room width and 116 inches of length. You can get away with 24 inches of clearance, but a nightstand will crowd it.
What size sheets fit a split king mattress?
Buy sheets labelled split king. 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 split king long enough for a tall person?
A mattress should be about 4 to 6 inches longer than the tallest sleeper. At 80 inches, a split king suits someone up to roughly 76 inches tall, which is 6 feet 4 inches. Above that, look at an even longer specialty size.
Does split king 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 76 by 80 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.