Sheet sizing
What Sheets Fit a 15 Inch Mattress?
Quick answer
A 15 inch mattress needs a deep pocket fitted sheet, which is rated to 17 inches. Add a topper and the sheet has to clear that too.
Fitted sheets are sold by pocket depth, the amount of mattress the corner can swallow. A deep pocket sheet is rated to 17 inches. The mistake that catches people is forgetting the topper: a 3 inch topper on this mattress makes the stack 18 inches, which is a different sheet.
Which pocket depth do you need?
| Pocket class | Fits mattress depth | Right for a 15 inch mattress |
|---|---|---|
| Standard pocket | up to 12 in | No |
| Deep pocket | 13 to 17 in | Yes |
| Extra deep pocket | 18 to 22 in | No |
Industry standard
These are standard published dimensions, the same across manufacturers.
What happens when you add a topper or protector?
Everything between the mattress and the sheet counts toward pocket depth. A protector adds very little, but a topper adds its full thickness.
| Added on top | Total depth | Pocket class needed |
|---|---|---|
| Nothing | 15 in | Deep pocket |
| 2 in topper | 17 in | Deep pocket |
| 3 in topper | 18 in | Extra deep pocket |
| 4 in topper | 19 in | Extra deep pocket |
Industry standard
These are standard published dimensions, the same across manufacturers.
Sheets that fit this depth
Extra Deep Pocket Queen Fitted Sheet
$13.70Queen sheet, a stated pocket depth of 16 to 21 in.
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Bedsure Queen Sheet Set - 4 Pieces Soft
$14.39Queen sheet.
Check price on Amazon Extra Deep Pocket King Fitted Sheet
$19.99King sheet, a stated pocket depth of 16 to 21 in.
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Bedsure Deep Pocket Queen Sheets Set - Fits Mattresses Up to 21 Inches Thick -
$24.99Queen sheet set of 4, a stated pocket depth of up to 21 in.
Check price on AmazonFrequently asked questions
What size fitted sheet do I need for a 15 inch mattress?
Buy your mattress size, then check the pocket depth separately. A 15 inch mattress needs a deep pocket sheet, rated to 17 inches. Pocket depth is printed on the packaging and is separate from the bed size.
How deep are deep pocket sheets?
Deep pocket fitted sheets fit mattresses roughly 13 to 17 inches deep. Standard pockets cover up to about 12 inches, and extra deep pockets run 18 to 22 inches. These classes are published by manufacturers and are consistent enough to shop by, but the exact figure is always on the individual product.
Does a mattress topper change the sheet I need?
Yes, and by its full thickness. A 3 inch topper on a 15 inch mattress creates a 18 inch stack, and the fitted sheet has to clear all of it. This is the single most common reason a sheet that used to fit suddenly pops off the corners after someone adds a topper.
What if my sheets keep coming off the corners?
Usually the pocket is too shallow for the stack. Measure from the top of the mattress to the bottom edge, including any topper and protector, and buy a sheet rated for that depth. If the sheet is deep enough and still slips, elastic sheet straps under the mattress hold the corners down.
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.