Fit
Size and pocket depth
Mattress names are standard. Sheet patterns are not. Use these US sizes as the map, then confirm the inches inside the Amazon listing before you order.
| Size | Mattress | Note |
|---|---|---|
| Twin | 39 × 75 in | Fits a standard twin. Too short for dorm XL beds. |
| Twin XL | 39 × 80 in | Dorms, daybeds, and many adjustable bases. |
| Full | 54 × 75 in | Wider than twin, same length. Often skipped in linen. |
| Queen | 60 × 80 in | The common buy. Look for a generous flat sheet. |
| King | 76 × 80 in | Wider than queen, usually the same length. |
| Cal king | 72 × 84 in | Narrower than king, longer. Do not substitute. |
How thick is the mattress?
Include a topper. The sheet has to clear it.
This is the mattress most people own. Look for a 15- or 16-inch pocket. “Deep” without a number is how these come back.
Flat sheets and cases
A useful queen flat sheet has room to tuck — often around 96 by 102 inches on linen, sometimes larger. A flat that barely covers the top will not tuck, and linen that will not tuck looks sloppy in a way rumple does not.
Standard and queen cases are often 20 by 30 inches. King cases are about 20 by 36. Match the pillow, not the nostalgia of the set photo.
California king is the size people order wrong. It is longer than a king and a little narrower. A king flat sheet on a California king mattress comes up short at the foot.