UK Bed Sizes Explained: A Complete Guide With Measurements

There's a particular sinking feeling that comes with realising the bed you've just ordered is the wrong size. Sometimes you know straight away, because the mattress turns out to be a good 10cm wider than the frame it's meant to sit in. Sometimes it takes a few nights, and the first clue is a pair of feet hanging cheerfully over the end.

UK bed sizes are standardised, which is good news. The trouble is that the names don't tell you much. 'Small Double' sounds like a compromise, 'King' sounds enormous, and neither description helps you work out whether the thing will actually fit in your bedroom.

So here's the full picture: every standard size, what the measurements mean in practice, how much floor space you need around each one, and which size tends to suit which sleeper.

What are the standard UK bed sizes?

There are five standard UK bed sizes:

• Single (90 x 190cm),
• Small Double (120 x 190cm),
• Double (135 x 190cm),
• King (150 x 200cm),
• Super King (180 x 200cm).

Almost every mainstream UK bed frame, mattress and bedding set is built around these five measurements, which is why a UK Double duvet fits a UK Double bed without any guesswork.

The detail most people miss is the differences in length. Singles, Small Doubles and Doubles are all 190cm long. Kings and Super Kings jump to 200cm. So going from a Double to a King doesn't just give you 15cm more width; it also gives you an extra 10cm of legroom, and for anyone taller than 6ft, that matters more than the width does.

You'll occasionally see a Small Single (75 x 190cm) or an Emperor (200 x 200cm), but these sit outside the standard five and the choice of frames, mattresses and bedding narrows considerably.

All five standard sizes are available across the Nodax UK size bed frame range, in solid pine and a choice of wood-colour finishes.

How much bigger is a bed frame than the mattress?

A bed frame is always larger than the mattress it holds. Width usually adds roughly 5-10cm in total once you account for the side rails, and length adds rather more if the frame has a headboard and footboard. The size on the label refers to the mattress that fits inside; the frame's external measurements are what you need for your room.

This catches people out surprisingly often, and it's the reason a bedroom that looks like it'll take a King size bed on paper sometimes won't. If you've measured your alcove to the exact centimetre and it's tight, check the frame's external dimensions rather than the size name.

Every Nodax product page includes measurement diagrams for each size, showing the external width, length and height of that specific frame. It's worth a look before you order, particularly if the bed is going into a fitted space, a small bedroom, or a room with a sloping ceiling.

Depth is worth a thought too. Mattresses are typically between 15cm and 30cm deep, and a deeper mattress sits higher above the frame, which changes how the bed feels to get in and out of and how much of the headboard remains visible.

What size bed fits in a small bedroom?

For a small bedroom, aim to leave at least 60cm of clear walking space along one side of the bed and at the foot of it. As a rough guide, a Double bed needs a room of around 9 square metres to feel comfortable, and a King closer to 12 square metres. If less than that, the bed starts to dominate and the room becomes hard to use.

The measurement people forget is the door swing. A bed that fits the floor plan perfectly is still a problem if it blocks the wardrobe or stops the bedroom door opening fully.

If a Double feels like a squeeze, the Small Double is the size worth considering. At 120cm wide it gives a single adult a generous amount of room to stretch out, sits comfortably in most box rooms, and still leaves space for a bedside table on one side. It's a size that gets overlooked because the name undersells it.

Whichever size you choose, the floor underneath it is the most underused storage space in a small bedroom. Our underbed storage drawers have wheels and come in the same wood finishes as the frames, which keeps everything looking co-ordinated rather than improvised.

Which UK bed size is right for you?

Is a Small Double big enough for two people?

A Small Double works for two people occasionally, but it's tight for every night. At 120cm wide, each person has 60cm of space, which is about the width of a bath. It's a sensible choice for a guest room that takes couples now and then, or for one adult who likes room to move, but two people sharing full time will usually be happier in a Double or larger.

What's the difference between a King and a Super King?

Thirty centimetres of width! A King is 150 x 200cm; a Super King is 180 x 200cm. Both are the same length, so a Super King gives you no extra legroom, but plenty more elbow room. On a King, each person has 75cm of space; on a Super King, that rises to 90cm, which is the same width as a whole single bed each!

The practical difference is usually the room rather than the sleep. When measuring a room for a Super King, remember to include adequate space for the bedside tables too, so measure the full width of the wall before committing.

What size bed is best for a tall sleeper?

King or Super King, because both are 200cm long rather than the 190cm of a Single, Small Double or Double. If you're 6ft 2in or taller, that extra 10cm is the difference between your feet reaching the end of the mattress and not. Anyone over 6ft 3in should also allow for the fact that a mattress rarely feels as long as its measurement once bedding is tucked in.

What about weight limits and larger sleepers?

Weight limits vary by frame and by size rather than by brand promise, so it's worth checking the figure rather than assuming. Nodax bed frames carry a 200kg limit on Singles and 400kg on Small Double and above, with every size from Small Double upwards built around a central support beam and four extra support legs.

The F8 Sirius extra strong bed frame is designed for considerably higher loads again and comes with a lifetime guarantee, where the rest of the wooden range carries our standard 10-year guarantee.

What size bed do children need?

A Single (90 x 190cm) suits most children from toddler bed age right through to their late teens, which is why it's the standard choice for children's rooms. If the room can take it, a Small Double is a sensible long-term buy, since it gives a growing teenager more room and won't need replacing when they hit a growth spurt.

How do UK bed sizes compare to European bed sizes?

Some European bed sizes are longer than UK sizes, and the widths are often bigger too. A European Double is 140 x 200cm against a UK Double's 135 x 190cm, and a European King is 160 x 200cm, against a UK King's 150 x 200cm. That extra 10cm of length is why EU sizes suit taller sleepers so well.

Don't forget about bedding and mattress compatibility, since a UK mattress won't fit an EU frame properly and vice versa. If you already own an EU-size mattress, or you're taller than the UK sizes comfortably allow, our full guide on European size bed frames covers the sizing, the mattress question and who genuinely benefits from making the switch.

Frequently Asked Questions

What are the standard UK bed sizes in cm?

The five standard UK bed sizes are Single (90 x 190cm), Small Double (120 x 190cm), Double (135 x 190cm), King (150 x 200cm) and Super King (180 x 200cm). Singles, Small Doubles and Doubles are all 190cm long, while Kings and Super Kings are 200cm long. These measurements refer to the mattress, not the external size of the bed frame.

Is a Double bed big enough for two adults?

A Double bed gives each person 67.5cm of width, which is workable but not generous for two adults sharing every night. Most couples who upgrade from a Double to a King (150cm wide) notice the difference immediately, particularly if one of them moves around in their sleep. If the room can take a King, it's usually the better long-term choice.

How much space do you need around a bed?

Leave at least 60cm of clear space along one side of the bed and at the foot of it, so you can walk past and make the bed without shuffling sideways. Ideally you'd have that clearance on both sides for a bed shared by two people. Also check the door swing and any wardrobe doors before you settle on a size.

Is a UK King size the same as a European King?

No. A UK King is 150 x 200cm, while a European King is 160 x 200cm, so the European version is 10cm wider. The two aren't interchangeable, which means UK mattresses and bedding won't fit a European frame correctly. Check which system your existing mattress belongs to before ordering a new frame.

What size bed frame do I need for a 190cm mattress?

A mattress 190cm long is a UK Single, Small Double or Double, depending on its width: 90cm for a Single, 120cm for a Small Double and 135cm for a Double. Order the bed frame in the matching size name and the mattress will fit. If your mattress is 200cm long, it's a UK King or UK Super King, or a European size, so it's worth double-checking.

Choosing your bed frame size

Most size regrets come down to one of two things: not allowing for the frame being bigger than the mattress, or underestimating how much length a taller sleeper actually needs. Measure the room, check the frame's external dimensions, and the rest tends to sort itself out.

All five UK sizes are available across our best selling bed frames, made from solid pine with a 10-year guarantee and rated 4.9/5 across 6,500+ customer reviews. Most are in stock for free next-business-day delivery to UK mainland postcodes when you order by 11am, and you can pick your own delivery date at checkout.