Queen Comforter Size and Comforter Size Chart
Choose a bed size and enter the mattress thickness and how far you want the comforter to hang to get the width and length you need, next to the sizes makers list.
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How to use the Comforter Size Calculator
- Choose your bed in “Bed size”: twin, twin XL, full, queen, king or California king.
- Pick a preset if you want a quick start. Each preset sets a bed, a mattress thickness and an extra drop: Queen 12 in with 2 in, King 14 in with 4 in, Full 10 in with 2 in, and Twin 9 in with 0 in.
- Under “Measure in”, choose inches or centimeters.
- Enter the “Mattress thickness”. Measure from the top of the mattress to the bottom, including any topper or pad. The page expects 4 to 30 in and warns outside that range.
- Enter the “Extra drop below the mattress”, which is how far past the bottom of the mattress you want the comforter to hang. You choose it: 0 ends at the mattress bottom and 2 is only a starting value. A value over 20 in triggers a warning.
- Read “Comforter size needed”, shown as at least a width and a length.
- Compare it with “Sizes listed for this bed” from sources A, B and C. “Listed sizes that are large enough” says how many of the three list a size at least that large.
- Read “Hang on each side, from the mattress edge” to see how far the comforter reaches down each side.
- Read “Duvet cover for that comforter”, which shows a range for how much larger a cover can be.
- The second table shows what every bed needs at the same thickness and extra drop.
Why does a queen comforter size differ between sources?
Comforter sizes are not standardized, so each maker sets its own figures. The sleep guide (source A) lists a queen at 86 to 90 by 90 to 100 inches, the mattress maker (source B) lists 86 to 88 by 96 to 100, and the bedding maker (source C) lists 88 by 92. Read the queen figures in the chart as a range to compare, not as one fixed answer.
The same spread appears for the other sizes. King comforters are listed at 90 to 108 by 86 to 108 inches in source A, 102 by 86 to 88 in source B, and 106 by 92 in source C. For a full, the sources give 78 to 88 by 86 to 92, 81 to 84 by 86 to 88, and 82 by 86. Twin listings are closer: 66 to 68 inches wide in sources A and B and 68 in source C.
Source C prints length by width, and this page converts it to width by length so all three can be read the same way. The sources also disagree on drape. Source B advises 8 to 12 inches of drape, but its summary line says 12 to 20 inches, so the source contradicts itself. Source A gives a rule: comforter width should equal the mattress width plus twice the mattress height, with a few extra inches for more drape. Source C says an 88-inch queen comforter leaves about 14 inches of drape on each side of a standard queen mattress.
How is the comforter size needed calculated?
The calculator uses two formulas. Width equals the mattress width plus 2 × (thickness + extra drop). Length equals the mattress length plus thickness plus extra drop. The length rule is this page’s own geometry, not a rule from a source. The foot end hangs over the mattress, and the head end stays at the pillows.
Source A’s example checks the width formula. A mattress 60 inches wide and 15 inches thick, with no extra drop, needs 90 inches, which matches the calculator’s result when the extra drop is zero.
A queen with a 12-inch mattress and a 2-inch extra drop needs 88 × 94 inches. Sources A and B each list a queen at least that large. Source C’s 88 × 92 is 2 inches too short in length. The hang on each side is 14 inches, which is the thickness plus the extra drop.
A twin with a 9-inch mattress and no extra drop needs 56 × 84 inches, and all three sources list a twin at least that large. A king with a 14-inch mattress and a 4-inch extra drop needs 112 × 98 inches. None of the three sources lists a king that wide, since the widest king listing is 108 inches in source A.
Treat each result as a calculation from your inputs and the named sources. It is not a guarantee that a comforter will fit your bed.
Sources (checked 15 October 2026): blog.saatva.com · mattressstoreslosangeles.com · sleepfoundation.org · amerisleep.com · nectarsleep.com · viscosoft.com
Worked examples
| Input | Result |
|---|---|
| Queen, 12 in mattress, 2 extra drop | at least 88 × 94 in; 2 of 3 sources list one |
| King, 14 in mattress, 4 extra drop | at least 112 × 98 in; 0 of 3 sources list one |
| Twin, 9 in mattress, 0 extra drop | at least 56 × 84 in; 3 of 3 sources list one |
| Full, 30 cm mattress, 5 extra drop | at least 81.56 × 88.78 in; 1 of 3 sources list one |
| California king, 15 in mattress, 3 extra drop | at least 108 × 102 in; 1 of 3 sources list one |
Calculated by the tool above; open it with the same values to see each step.
Frequently asked questions
What is the queen comforter size?
The sources give a queen range rather than one size. The widest queen listing is 90 inches in source A, and the longest is 100 inches in sources A and B. For a size based on your own mattress, use the calculator.
What is the size of king comforter?
Source A lists 90 to 108 by 86 to 108 inches, source B lists 102 by 86 to 88, and source C lists 106 by 92. None of these covers a king with a thick mattress and a large extra drop, so check the calculated size for your bed.
What is the full size comforter size?
The full size comforter size is 78 to 88 by 86 to 92 inches in source A, 81 to 84 by 86 to 88 in source B, and 82 by 86 in source C. The full preset thickness on the calculator is 10 in.
What are the twin size comforter dimensions?
Source A lists 66 to 68 by 86 to 90 inches, source B lists 66 to 68 by 86 to 88, and source C lists 68 by 90. A twin XL is 68 inches wide in all three sources, and its length is 86 to 90 inches in source A and 90 inches in sources B and C.
Does the calculator store my numbers?
No. The calculator runs in your browser. Nothing is stored or uploaded, it needs no sign-up, and it is free to use.
How big should a duvet cover be?
Source B says a cover should be the same size as the comforter or up to 4 inches larger in length and width. Another maker says the difference is only 1 or 2 inches. The calculator shows the 0 to 4 inch range, and no separate duvet cover size chart was found.
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