An emperor duvet cover is 290 x 235 cm, which makes it the largest standard duvet cover size in the UK. It's made for an emperor bed, a square mattress of 200 x 200 cm, and it also works on a super king or king bed for extra drape. Adam Home's emperor duvet covers are 290 x 235 cm, 90 of our 91 sets come in Emperor at £42.99, and each set has 2 pillowcases at 54 x 77 cm. This guide covers the emperor bed size, how emperor compares with super king and king, what a 290 x 235 cm duvet is, whether a super king duvet fits an emperor cover, and where to find an emperor duvet.
What size is a 290x235 duvet?
A 290 x 235 cm duvet is an emperor duvet. The first number is the width across the bed and the second is the length from pillow to foot, so it's about 114 x 93 inches.
Soak&Sleep's duvet size guide lists the emperor at 290 x 235 cm and calls it the largest size it offers. The same guide says it's designed for emperor beds and also suits super king and king beds. An emperor duvet cover is cut to the same 290 x 235 cm, because a cover is sized to the duvet that goes inside it, not to the mattress. Our guide to duvet cover sizes in the UK lists every size from single to emperor.
How big is an emperor bed in the UK?
A UK emperor bed takes a 200 x 200 cm mattress, which is 6ft 6in square. Tempur lists the emperor at 200 x 200 cm and calls it the largest of its special sizes.
Emperor isn't one fixed size across the industry. Bed maker OBC says the emperor mattress size "can vary from retailer to retailer", and that some retailers make emperor beds at 215 x 215 cm, or 84 x 84 inches. That larger version is the one sold as a 7ft emperor or large emperor. Bed Advice UK, published by the National Bed Federation, gives 215 cm as 7ft 0in.
So measure your mattress before you buy bedding. If it's 200 x 200 cm, a 290 x 235 cm cover gives you plenty of width. If it's 215 x 215 cm, the cover still fits, with less hanging down each side. Our guide to UK bed and mattress sizes has the full list from small single upwards.
Is Emperor bigger than Superking?
Yes, emperor is bigger than super king. An emperor mattress is 200 x 200 cm and a super king mattress is 180 x 200 cm, so emperor is 20 cm wider and the same length.
The duvets grow by more than the beds. Soak&Sleep lists the super king duvet at 260 x 220 cm and the emperor at 290 x 235 cm, so the emperor duvet is 30 cm wider and 15 cm longer. Our own covers follow the same step: the Adam Home super king cover is 265 x 225 cm and the emperor cover is 290 x 235 cm, which is 25 cm wider and 10 cm longer.
How do emperor, super king and king sizes compare?
Emperor is the largest of the three, in mattress size and in duvet size. King and super king share the same 200 cm length, and only emperor adds length to the duvet and cover.
| Size | Mattress (cm) | Duvet (cm) | Adam Home cover (cm) | Adam Home set price |
|---|---|---|---|---|
| King | 150 x 200 | 230 x 220 | 235 x 225 | £34.99 |
| Super King | 180 x 200 | 260 x 220 | 265 x 225 | £38.99 |
| Emperor | 200 x 200 | 290 x 235 | 290 x 235 | £42.99 |
Mattress sizes are from Tempur's UK size guide, and duvet sizes are from Soak&Sleep's size guide. Our own microfibre duvet comes in a 225 x 220 cm king and a 260 x 220 cm super king, so check the label on your duvet rather than going by the size name. Our guide to UK duvet sizes explains why makers' measurements differ by a few centimetres.
On an emperor bed, a 290 cm wide cover hangs about 45 cm over each side of a 200 cm mattress. On a super king bed, the same cover hangs about 55 cm over each side, which is why some people buy emperor bedding for a super king bed. We think it's worth it if you like a cover that reaches well down the sides.
Does an emperor cover fit a super king duvet?
Yes, a super king duvet goes inside an emperor cover, but it won't fill it. A 260 x 220 cm super king duvet in a 290 x 235 cm emperor cover leaves 30 cm spare across the width and 15 cm down the length.
Split evenly, that's 15 cm of empty cover at each side and 15 cm at the foot. The cover will look a little loose, and the duvet can slide around inside it during the night. To keep the gap where it does least harm, push the duvet's top corners right into the top corners of the cover before you close it, so the spare fabric sits at the sides and the foot rather than under your chin.
It works the other way too. An emperor duvet won't go into a super king cover without bunching, because it's 25 cm wider than our super king cover and 10 cm longer. So buy the cover in the same size as the duvet you own.
Where can you find an emperor duvet?
Look for an emperor duvet from a bedding brand that sells the full UK size range. Soak&Sleep, for example, sells duvets up to emperor, at 290 x 235 cm.
Adam Home doesn't sell an emperor duvet. Our microfibre duvet stops at Super King, 260 x 220 cm, in 2.5 to 15 tog from £21.99 to £30.99. If you'd rather not hunt for an emperor duvet, a super king duvet inside an emperor cover is the simple fix, with the 30 cm and 15 cm gaps described above. If you want the cover filled edge to edge, buy a true 290 x 235 cm emperor duvet from a brand that makes one.
We don't sell emperor fitted sheets or mattress toppers either. Our extra deep fitted sheet and mattress topper stop at Super King, so you'd need those from another shop for a 200 x 200 cm mattress.
What comes in an Adam Home emperor duvet cover set?
An Adam Home emperor set has 1 duvet cover at 290 x 235 cm and 2 pillowcases at 54 x 77 cm. The duvet itself isn't included, and every Emperor set costs £42.99.
The covers are 100% polyester microfibre with a snap-button closure, designed and made in the UK and only available at adamhome.co.uk. Most have a printed front and a plain white back, and two are reversible. Our guide to what comes in a duvet cover set goes through each piece.
The pillowcases are standard size, not emperor pillowcases. An emperor pillow is about 50 x 100 cm, according to OTTY's and The Wool Room's size charts, so it won't fit a 54 x 77 cm case.
Ninety of our 91 designs come in Emperor. The one that doesn't is Mona Stripe, which stops at Super King. You can browse all our emperor duvet cover sets in the duvet cover collection, from plaids and gingham to florals and abstracts, with Single to Emperor sizes on each product page.
Written by the Adam Home team in the UK.
