Comforter and duvet sizes

Comforters are larger than the mattress so they drape. Exact numbers vary by brand.

Short answer: a sleep-research guide gives comforter size ranges, not a single number: a queen is listed at 86 to 90 × 90 to 100 in, and a king at 90 to 108 × 86 to 108 in.^{[1 · Nov 12, 2026]} One maker sells three combined sizes: Twin/Twin XL 68 × 92 in, Full/Queen 92 × 96 in and King/California King 110 × 96 in.^{[2 · Nov 12, 2026]} To cover both sides of the mattress, that guide says to add twice the mattress height to its width; its example is a 15 in high, 60 in wide mattress needing a 90 in wide comforter.^{[1 · Nov 12, 2026]}

A mother and her teenager snap a flat sheet over a queen bed while a cat watches from a bench at the foot of the bed

Comforter size ranges

Size	Comforter (in)^{[1 · Nov 12, 2026]}	Mattress (in)^{[1 · Nov 12, 2026]}
Twin	66 to 68 × 86 to 90	38 × 75
Twin XL	68 × 86 to 90	38 × 80
Full	78 to 88 × 86 to 92	54 × 75
Queen	86 to 90 × 90 to 100	60 × 80
King	90 to 108 × 86 to 108	76 × 80
California king	90 to 110 × 92 to 108	72 × 84

The same guide notes that some comforters are sized to fit either a full or a queen, and that a queen comforter on a full will drape more, while a full comforter on a queen will not cover enough.^{[1 · Nov 12, 2026]} King comforters are wider; California king comforters are longer, matching those mattresses.^{[1 · Nov 12, 2026]}

One maker's comforter sizes

This maker's size^{[2 · Nov 12, 2026]}	Inches
Twin/Twin XL	68 × 92 in
Full/Queen	92 × 96 in
King/California King	110 × 96 in

That maker says to match a duvet cover you already own exactly, and that sizing up (a king comforter on a queen bed) gives more side coverage.^{[2 · Nov 12, 2026]}

Duvet cover sizes

A duvet cover is a separate piece. The same sleep-research site's sheet chart lists these duvet cover sizes:^{[3 · Nov 12, 2026]}

Size	Duvet cover (in)^{[3 · Nov 12, 2026]}
Crib	45 × 60
Twin	74 × 98
Full	80–90 × 89–94
Queen	88–90 × 90–94
King	104 × 90–94
California king	114–116 × 96–100

Compare the cover with the insert; brands do not all use the same numbers. For fitted and flat sheets, see sheet sizes. For a blanket that is sized and weighted as a product of its own, see weighted blanket sizes.

Questions people ask

What size is a queen comforter?

A sleep-research guide lists queen comforters at 86 to 90 × 90 to 100 in. One maker's Full/Queen comforter is 92 × 96 in. Check the listed dimensions.

How do I choose a comforter width?

That guide says to multiply the mattress height by two and add it to the width. Its example: a 15 in high, 60 in wide mattress needs a 90 in wide comforter to cover both sides.

Is a duvet cover the same size as a comforter?

Not always. Duvet cover charts and comforter charts use different ranges, and brands combine sizes differently. Match the cover to the insert's listed size.

Sources: 1. Sleep Foundation, Comforter sizes guide. 2. Brooklinen, Down comforter size chart. 3. Sleep Foundation, Bed sheet sizes. Checked Nov 12, 2026. Trademarks belong to their owners; figures are restated in our own words and tables, not reproduced.