What Size Is a Double, King or Super King Duvet? UK Sizes in cm and Inches

A king size duvet is 229 cm wide. A king size mattress is 150 cm wide. If you have just seen both numbers and wondered which one is wrong, it is neither: a duvet is cut wider than the bed so that it hangs over the sides.

Our duvets are 137 x 198 cm for a single, 198 x 198 cm for a double, 229 x 218 cm for a king and 259 x 218 cm for a super king, with cot duvets at about 120 x 150 cm. The table below shows which mattress each one is made for and how far it hangs over each side.

The rest of this guide covers how to measure your bed, what to do when you sit between two sizes, and which duvet cover goes with which duvet. Sizes differ by a few centimetres between sellers, so go by the numbers on the listing, not the name.

What are the standard UK duvet sizes?

The size names are the same across UK sellers, but the dimensions are not identical. Some sellers list a double at 200 x 200 cm. Ours is 198 x 198 cm (78 x 78 in), because we size in inches, and a 2 cm difference will not change how it sits on the bed.

The mattress column shows the standard UK size for each bed. The hang is how far the duvet reaches past the mattress on each side, worked out as the duvet width minus the mattress width, divided by two.

Duvets Size Chart
Size	Duvet (cm)	Duvet (inches)	Standard mattress (cm)	Hang each side
Single	137 x 198	54 x 78	90 x 190	23.5 cm
Double	198 x 198	78 x 78	135 x 190	31.5 cm
King	229 x 218	90 x 86	150 x 200	39.5 cm
Super king	259 x 218	102 x 86	180 x 200	39.5 cm
Cot (approx.)	120 x 150	47 x 59	Measure your cot mattress	Not applicable

What size is a single duvet?

A single duvet is 137 x 198 cm (54 x 78 in), made for a standard 90 x 190 cm single bed. It hangs about 23.5 cm over each side of the mattress.

What size is a double duvet?

A double duvet is 198 x 198 cm (78 x 78 in), made for a standard 135 x 190 cm double bed, and it hangs 31.5 cm over each side. It is square, and that is normal for a UK double, so a duvet as long as it is wide is not a mistake.

What size is a king size duvet?

A king size duvet is 229 x 218 cm (90 x 86 in), made for a 150 x 200 cm king size bed. It hangs 39.5 cm over each side, and about 18 cm over the foot if the top edge sits level with the head of the mattress.

What size is a super king duvet?

A super king duvet is 259 x 218 cm (102 x 86 in), made for a 180 x 200 cm super king bed, and it hangs 39.5 cm over each side. The length is the same as the king, so a super king duvet is wider, not longer.

What size is a cot duvet?

Cot duvets are about 120 x 150 cm (47 x 59 in), but cots vary, so measure the mattress before you order. Our cot duvets come in 4.5, 7.5 and 9 tog.

How do I measure my mattress for a duvet?

Lay a tape across the top of the mattress at its widest point, side to side, then head to foot. Note the depth too if you have a topper or a thick mattress. Measure the mattress, not the frame, because the frame adds a few centimetres of wood that the duvet does not need to cover. A mattress within about 5 cm of a standard size takes that size of duvet.

How do I choose the right duvet size?

Measure the mattress, not the frame. Take the width side to side, the length head to foot and, if you have added a topper, the depth. Then choose the duvet made for that mattress. The usual advice is a hang of 20 to 30 cm on each side, enough to cover the bed and stay in place.

A mattress topper makes the bed deeper, so the duvet has further to go down each side. Allow for it before you pick, and size up if the hang looks short.

If you sit between sizes, work out the hang. A double duvet on a 150 cm king bed hangs 24 cm on each side, which is inside the usual range. A king duvet on a 135 cm double bed hangs 47 cm on each side, which is a lot of duvet to hang off the bed. Two sleepers who pull the duvet are the usual reason to go up a size. If that is you, size up the cover to match.

What if my bed is not a standard size?

Work backwards from the hang. Take the mattress width and add 40 to 60 cm, which gives the duvet width for a hang of 20 to 30 cm on each side. A 140 cm European double needs a duvet of about 180 to 200 cm wide, so our 198 cm double is the fit, hanging 29 cm each side.

A 120 cm small double is the awkward one. We list no duvet that size: a double hangs 39 cm each side, and a 137 cm single hangs only 8.5 cm, which will not cover the sides. Most people with a small double choose the double. For anything outside the four sizes, ring 01204 455755 and ask.

What size duvet cover goes with my duvet?

Our duvet covers list the same four sizes as our duvets, in the same centimetres, so a double duvet goes in a double cover at 198 x 198 cm. Some sellers advise a cover 2 to 5 cm bigger than the duvet. Match the size names, then check the dimensions on the listing before you order.

Does a bigger duvet mean a warmer duvet?

No. Size sets the coverage and tog sets the warmth. A super king 4.5 tog is still a summer-weight duvet, and a single 13.5 tog is still a winter-weight one. Choose the size for the bed and the tog for the room, and our duvet buying guide explains how to choose the tog.

Buying duvets for more than one bed?

If you are fitting out several bedrooms, the sizes above are the same across our listings, and selected duvets come in bags of 5, 10, 50 and 100 with no minimum order. Hotels and the NHS buy from us. Mix the sizes to match the beds, and check each listing for the pack options.

Duvet size FAQs

What size is a double duvet?

198 x 198 cm (78 x 78 in). It is square, and made for a standard 135 x 190 cm double bed.

What size is a king size duvet in cm?

229 x 218 cm (90 x 86 in). It is made for a standard 150 x 200 cm king size bed, and it hangs 39.5 cm over each side of the mattress. Some sellers list a king at 225 or 230 x 220 cm, so check the listing.

What size is a super king duvet?

259 x 218 cm (102 x 86 in), made for a 180 x 200 cm bed.

Can I use a king duvet on a double bed?

You can, but it is a lot of duvet for the bed. A king duvet, 229 cm wide, hangs 47 cm over each side of a 135 cm double mattress, against the 20 to 30 cm that is usual. If you want more cover for two sleepers, a double duvet on a king bed is the neater way round, because it hangs 24 cm each side.

Is a double duvet big enough for two people?

It is the size made for a double bed, so it covers a 135 cm mattress with 31.5 cm hanging over each side. If one of you tends to pull it across, go up to a king and a king cover.

What size duvet do I need for a cot?

About 120 x 150 cm, but cots vary, so measure the cot mattress first. Our cot duvets come in 4.5, 7.5 and 9 tog.

Do duvet sizes vary between shops?

Yes, by a few centimetres. A double is 198 x 198 cm on our listings and 200 x 200 cm at some other sellers, and the king ranges from 225 to 230 cm wide. The size name is a guide, so go by the dimensions on the listing and the mattress you measured.

Shop duvets by size and tog

Shop duvets by size and tog on our duvets page, where every listing shows its sizes. For warmth, read the duvet buying guide, or go straight to 4.5 tog, 10.5 tog, 13.5 tog or 15 tog duvets. To dress the bed, browse duvet covers and fitted sheets. Buying for a business: wholesale duvets. Unused, unwashed and undamaged duvets can go back within 365 days.