Quick answer
Measure mattress width, length and height. Add twice the desired side drop to the width. A queen mattress is 60 inches wide; with a 14-inch drop on both sides, look for a comforter close to 88 inches wide.
Common US comforter dimensions
| Label | Typical dimensions (in) | Typical dimensions (cm) | Mattress size |
|---|---|---|---|
| Twin | 66–68 × 86–88 | 168–173 × 218–224 | 38 × 75 in |
| Twin XL | 66–68 × 90–92 | 168–173 × 229–234 | 38 × 80 in |
| Full/Queen | 81–90 × 86–100 | 206–229 × 218–254 | 54 × 75 or 60 × 80 in |
| King | 102–110 × 86–100 | 259–279 × 218–254 | 76 × 80 in |
| California King | 104–114 × 96–104 | 264–290 × 244–264 | 72 × 84 in |
Measure the mattress, not the old comforter
Measure the mattress at its widest and longest points, then record its height from the bottom edge to the sleeping surface. Include a topper if it permanently stays on the bed.
Comforter dimensions vary widely. Use the product's inch measurements as the purchase criterion and treat its size name as a shortcut only.
- Mattress width
- Mattress length
- Mattress plus topper height
- Distance from mattress top to desired hem
Calculate the side drop
Use this formula: mattress width + (2 × desired side drop) = target comforter width. A 60-inch queen with a 14-inch drop needs about 88 inches of width.
Platform beds often look balanced with a 10–14 inch drop. Taller box-spring beds may need 15–20 inches. Do not plan to tuck a thick comforter under the mattress unless the product is made for that.
- 10–12 inches: tailored, modern look
- 13–15 inches: versatile everyday drape
- 16–20 inches: tall bed or plush hotel look
- Add width when two sleepers share the bedding
When sizing up makes sense
Choose an oversized Queen or King if the mattress is deep, the frame exposes the box spring, or one sleeper tends to pull the comforter across the bed.
Check length as well as width. A California King is longer but narrower than a standard King mattress; a comforter must account for that different shape.
- Mattress deeper than 14 inches
- Thick permanent topper
- Two sleepers
- Visible box spring or very tall frame
Frequently asked questions
What are standard comforter sizes?
There is no binding US comforter standard, so measurements vary by brand. Common ranges are about 66–68 by 86–88 inches for Twin, 81–88 by 86–100 for Full/Queen, and 102–110 by 86–100 for King.
Source: Sleep Foundation, Purple, The Spruce
How much bigger should a comforter be than the mattress?
Add roughly twice your desired side drop to the mattress width. For a 60-inch queen mattress and a 14-inch drop on each side, target about 88 inches of comforter width.
Source: Sleep Foundation, Purple, The Spruce
Should you size up a comforter?
Sizing up often improves coverage on deep mattresses or shared beds. Check actual dimensions rather than the label, because a Full/Queen comforter can be much narrower than an oversized Queen.
Source: Sleep Foundation, Purple, The Spruce
What size comforter fits a 60 by 80 inch bed?
A 60 by 80 inch mattress is Queen size. Most people need a Full/Queen or Queen comforter around 86 to 90 inches wide, with extra width for a tall mattress or generous drape.
Source: Sleep Foundation, Purple, The Spruce
Sources and methodology
We cross-checked practical guidance against manufacturer care instructions and established editorial or standards sources. Always follow the sewn-in care label on your own product.