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Bedding is sold by bed name, but the pieces are not the same size. A queen fitted sheet is 60 × 80 in and the queen comforter over it is 88 × 96 in. Here is what every piece measures, and the pocket depth your mattress actually needs.
| Mattress | Fitted sheet | Flat sheet | Duvet or comforter | Pillows |
|---|---|---|---|---|
| Twin | 38–39 × 75 in | 66–68 × 96 in | 66–68 × 86–88 in | 1 standard (20 × 26 in) |
| Twin XL | 38–39 × 80 in | 66–68 × 102 in | 68 × 90 in | 1 standard (20 × 26 in) |
| Full | 53–54 × 75 in | 81–85 × 96–100 in | 80–84 × 86–90 in | 2 standard (20 × 26 in) |
| Queen | 60 × 80 in | 90–92 × 102–106 in | 86–90 × 92–96 in | 2 queen (20 × 30 in) |
| King | 76–78 × 80 in | 108 × 102 in | 102–108 × 90–94 in | 2 king (20 × 36 in) |
| California King | 72 × 84 in | 108 × 102 in | 104–110 × 94–98 in | 2 king (20 × 36 in) |
| Split King | two 38–39 × 80 in (twin XL) | two 66–68 × 102 in, or one 108 × 102 in | 102–108 × 90–94 in | 2 king (20 × 36 in) |
Bedding is not standardized the way mattresses are. Mattress dimensions are fixed, but sheet and comforter cuts vary between manufacturers, so these are the common US retail ranges — check the size on the packaging of the set you are buying. The fitted sheet is the only piece cut to the mattress; everything else is deliberately larger so it can tuck or hang.
Sheet and duvet dimensions are the common US retail sizes. They are not a legal standard, so brands differ slightly — the figures here are the middle of the range you will actually find in shops.
Pocket depth is the number that goes wrong. A fitted sheet has to cover the mattress top, wrap the sides and tuck underneath. Standard fitted sheets fit mattresses up to about 14 inches; deep-pocket up to 18; extra-deep up to 22.
The calculator adds your mattress height to the check and tells you which pocket depth to buy. If you use a mattress topper, measure with the topper on — that is the height the sheet has to cover.
One rule worth knowing: a flat sheet is always wider than the mattress by roughly the mattress height on each side plus a tuck. That is why a Queen flat sheet is 90 inches wide for a 60-inch mattress.
No. A Twin XL is 5 inches longer, so a Twin fitted sheet will not stretch over it, and a Twin XL sheet on a Twin will be loose at the corners. The flat sheets are closer but a Twin flat sheet is 6 inches shorter.
The flat sheet and pillowcases yes, the fitted sheet no. A King is 76 × 80 and a California King is 72 × 84 — a King fitted sheet is 4 inches too wide and 4 inches too short, and will pop off the corners.
Measure your mattress from the bottom seam to the top, including any topper. Up to 14 inches takes a standard fitted sheet, 15 to 18 needs deep-pocket, and over 18 needs extra-deep. Pillow-top and hybrid mattresses are usually the ones that need deep.
Close but not identical. A comforter is usually slightly wider because it is designed to drape over the sides of the bed; a duvet is sized to its cover. Buy the cover to match the duvet insert, not the mattress.
Queen duvets range from 88 to 92 inches wide across brands, and a taller mattress eats the overhang. If you want the duvet to reach the bed frame on both sides, size up to King — it is the most common fix and the reason many people with Queen beds buy King bedding.
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