Mattress sizes
King (Eastern King) Mattress Dimensions
Quick answer
A King (Eastern 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 king (eastern 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 king (eastern 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 king (eastern 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 king (eastern king) compare to other mattress sizes?
| Size | Width (in) | Length (in) | Area (sq ft) | Standard size |
|---|---|---|---|---|
| King (Eastern 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 king (eastern king)?
Every mattress below publishes king (eastern king) as its size. Prices change often.
King Size Mattress
$199.9914 inch king hybrid, medium firm feel as the maker describes it.
Check price on Amazon
Novilla King Size Mattress
$269.9912 inch king memory foam.
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EGOHOME King Size Memory Foam Mattress 12 Inch
$299.9912 inch king memory foam, medium firm feel as the maker describes it.
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Zinus Memory Foam 12 Inch Green Tea Mattress
$359.9912 inch king memory foam.
Check price on AmazonFrequently asked questions
What are the dimensions of a king (eastern king) mattress?
A king (eastern 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 king (eastern 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 king (eastern 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 king (eastern king) mattress?
Buy sheets labelled king (eastern 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 king (eastern 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 king (eastern 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 king (eastern 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.