King Size Comforter Dimensions and Comforter Size Chart

King size comforter dimensions run from about 102 to 114 in on the long side and 90 to 98 in on the short side (259 to 290 cm by 229 to 249 cm), across nine US bedding makers we checked in September 2026. On a King mattress, which is 76 × 80 in (193 × 203 cm), that leaves 13 to 19 in hanging over each side (our calculation).

102–114 inKing comforter, long side
90–98 inKing comforter, short side
88–98 inQueen comforter, long side
64–70 inTwin comforter, width
114–116 in"Oversized King"
13–19 inoverhang, King*

*Our calculation: (comforter width − mattress width) ÷ 2, before the thickness of the mattress.

Comforter size chart

Sizes as sold by US bedding makers on their own sites. Makers don't agree on which number comes first, so each range below gives the long side, which goes across the bed, then the short side. Twin comforters (for the 38 × 75 in Twin) are the exception: they are longer than they are wide.

Comforter size	Mattress	Comforter (in)	Comforter (cm)	Hangs over each side*
Twin / Twin XL	38 × 75 in / 38 × 80 in	64–70 wide, 86–92 long	163–178 wide, 218–234 long	13–16 in
Full	54 × 75 in	86–92 by 82–88	218–234 by 208–224	16–19 in
Queen (often sold as Full/Queen)	60 × 80 in	88–98 by 88–96	224–249 by 224–244	14–19 in
King (often sold as King/California King)	76 × 80 in	102–114 by 90–98	259–290 by 229–249	13–19 in
California King	72 × 84 in	102–104 by 96	259–264 by 244	15–16 in
Oversized King	76 × 80 in	114–116 by 98–112	290–295 by 249–284	19–20 in

*Our calculation for the long side across the bed. Ranges: nine bedding makers for the King, eight for the Queen, three for the Full, two for the California King and two for the Oversized King.

King comforter sizes on a King bed, top view drawn to scale, with the overhang on each side

How much should a comforter hang over?

The overhang has to cover the side of the mattress first. On a 12 in mattress, a King comforter that hangs 13 in over each side ends just below the mattress; one that hangs 19 in covers part of the box spring or frame too. So measure your mattress height, add a topper if you use one, and compare it with the overhang in the chart. If your bed is thick or high, the long end of the King range, or an Oversized King, gives the most coverage.

King or California King comforter?

Most makers we checked sell one comforter for both beds, labeled "King/California King". It works because a California King is 4 in narrower and 4 in longer than a King (California King bed size): a comforter 102 to 114 in across covers either. The two makers that sell a separate California King comforter list it at 102 to 104 in by 96 in.

What is an Oversized King comforter?

A King comforter cut bigger than usual, for more overhang. The Oversized King comforters we found measure 114 to 116 in on the long side, and 98 to 112 in on the short side, for about 19 to 20 in of overhang on each side of a King (our calculation). One maker also lists a "Super King" of 120 by 120 in.

Comforters for beds bigger than a King

A King comforter is too small for the oversized sizes. On a Wyoming King (84 × 84 in), a 102 to 114 in King comforter hangs only 9 to 15 in over each side, and an Oversized King 15 to 16 in (our calculation). On an Alaskan King (108 × 108 in), a King comforter barely covers the top, with 3 in to spare at most, and a 120 in "Super King" hangs 6 in: it needs a comforter made for the size.

Duvet covers and quilts

A duvet cover has to match its insert, so it follows the same sizes: the two King duvet covers we found are 107 to 110 in by 94 to 96 in. Quilts follow their own sizes (one maker's King quilt is 112 by 100 in), so check the finished size before you buy. Not sure which to buy? Duvet vs comforter. All mattress sizes, in inches and centimeters: bed size chart.

Comforter sizes: your questions answered

What are the dimensions of a king size comforter?

Across the nine US bedding makers we checked, King comforters measure 102 to 114 in on the long side and 90 to 98 in on the short side (259 to 290 cm by 229 to 249 cm). The long side goes across the bed.

Will a king comforter fit a California king bed?

Usually, yes: most makers we checked sell a single King/California King size. A California King is 72 in wide, 4 in narrower than a King, so a 102 to 114 in comforter hangs 15 to 21 in over each side (our calculation).

What size is a queen comforter?

88 to 98 in by 88 to 96 in across the eight makers we checked, often sold as Full/Queen. On a 60 in wide Queen mattress, with the long side across the bed, that is 14 to 19 in of overhang on each side (our calculation).

What size is a twin comforter?

64 to 70 in wide and 86 to 92 in long. It is often sold as Twin/Twin XL: the Twin XL mattress is 5 in longer than a Twin, and just as wide.

What size comforter do I need for an Alaskan King bed?

One made for it. An Alaskan King mattress is 108 × 108 in, so a King comforter covers the top with 3 in to spare at most. One maker lists its Alaskan King comforter at 142 × 126 in: about 17 in of overhang on each side (our calculation).

Should I buy a bigger comforter for a thick or high mattress?

Yes. Measure your mattress height plus any topper, then compare it with the overhang chart. For a thick or high bed, the long end of the King range, or an Oversized King, gives the most coverage.

Is a Twin comforter the same size as a Twin XL comforter?

Yes, on our chart: one Twin/Twin XL size, 64 to 70 in wide and 86 to 92 in long, covers both, even though the Twin XL mattress is 5 in longer.

Is a Queen comforter the same size as a Full comforter?

Not quite. Our chart lists them separately: 88 to 98 by 88 to 96 in for Queen against 86 to 92 by 82 to 88 in for Full, with only a few inches of overlap.

Last reviewed October 5, 2026.