King vs Super King Bed: What’s the Difference?

Torn between a king and a super king? They sound similar, but there is a meaningful 30cm gap in width and a real difference in the room each one needs. This guide sets out the exact UK dimensions, the floor space each size demands, and who each bed genuinely suits, so you can choose with confidence rather than guesswork.

1. King vs super king at a glance

Both a king and a super king are “big” beds by UK standards, comfortably larger than the double most couples upgrade from. The headline difference is width: a UK king size is 150cm wide, while a super king is 180cm wide. Both share the same 200cm length, which is 10cm longer than a standard double, so taller sleepers benefit from either size.

In short, a king gives each person the equivalent of a generous single’s worth of space, and a super king adds a further 15cm each. That extra width is the whole decision. Everything else, from bedding to frame styles, follows from it. If you want to see the full range of larger beds before you settle on a size, browse our king size beds and the wider beds collection.

2. Exact UK bed dimensions

UK bed sizes are standardised, so a “king” from one retailer measures the same as a king from another. That matters because your fitted sheets, mattress and frame all need to match. Here are the official measurements, with a standard double included for comparison.

These figures refer to the mattress, not the frame. The frame itself will add a few centimetres on each side, and more if it has a wide surround, a padded upholstered border or a footboard. Always work from the outer frame dimensions when you are planning where the bed will go. Our UK bed sizes guide covers every size from small single to super king if you need the complete picture.

3. How much bigger is a super king, really?

On paper it is 30cm of extra width, which is easy to underestimate. Split between two people, that is 15cm each, roughly the width of a paperback book laid flat on each side. It does not sound dramatic, but in bed it is the difference between two people whose shoulders occasionally touch and two people who can each spread out, turn over and change position without disturbing the other.

Put another way: a king gives each sleeper about 75cm of personal width, which is 15cm less than a standard single mattress (90cm). A super king gives each person a full 90cm, exactly a single’s worth of space each. If undisturbed sleep is your priority, that is the most useful way to think about the upgrade.

• King: 75cm per person, snug but roomy for most couples.
• Super king: 90cm per person, a full single each, noticeably more spacious.

The length is identical on both, so if headroom for tall sleepers is your concern rather than width, either size delivers the same 200cm.

4. Room size and clearance you need

Buying the right bed is as much about the room as the mattress. As a rule of thumb, you want at least 60 to 75cm of clear walking space on each side you use, so you can make the bed, get in and out comfortably and open any bedside drawers.

For a king (150cm wide), a bedroom of around 3m by 3m is a comfortable minimum, leaving room for bedsides and a wardrobe. For a super king (180cm), aim for a room of at least 3.3m by 3.3m, ideally more, so the bed does not dominate and doorways stay accessible. In a smaller room, a super king can leave you shuffling sideways past the footboard, which quickly becomes annoying.

Do not forget the vertical and access dimensions either: measure doorways, stair turns and landing space, because a rigid super king base or headboard may not make it around a tight corner. Our guide to measuring furniture before buying and the Will It Fit planner both help you sanity-check this before you order.

5. Mattresses, bedding and availability

King bedding is the more common of the two, so you will find the widest choice of duvets, sheets, mattress protectors and toppers, often at slightly lower prices simply because volumes are higher. Super king bedding is readily available too, but the range is a little narrower and premium sets can cost more.

One practical point couples often miss: on a super king, a single super king duvet is wide enough that partners are far less likely to tug it off one another, a genuine quality-of-life gain. Some couples on a king still prefer two single duvets to end the nightly tug of war.

Whichever size you choose, the mattress does the heavy lifting for comfort. A wider bed lets you choose zoned or pocket-sprung mattresses that isolate movement, so a restless partner is felt less. Explore options across our mattresses range, and if you are unsure on firmness and construction, our how to choose a mattress guide walks through it step by step.

6. Who a king size suits best

A king is the sweet spot for most UK couples and the natural upgrade from a double bed. It suits you if:

• You have a bedroom around 3m by 3m, or a little larger, and want room left over for bedsides and storage.
• You are a couple who want more space than a double without the bed swallowing the room.
• You value the widest choice of affordable bedding and frames.
• One or both of you is tall and wants the extra 10cm of length over a double, without needing maximum width.
• You are furnishing a guest room or main bedroom in a typical UK home and want a size that resells and re-beds easily.

For the large majority of buyers, a king is the practical, comfortable and future-proof choice. Pair it with matching bedside tables and coordinated bedroom furniture to complete the room.

7. Who a super king suits best

A super king is a genuine luxury, and it earns its place when the room can take it. Choose one if:

• Your bedroom is 3.3m by 3.3m or larger, with clear access and room to walk both sides.
• You are a taller or broader couple, or you simply prize maximum personal space and undisturbed sleep.
• Children or pets regularly climb in, and you want room for everyone.
• You want a bedroom that feels like a boutique-hotel retreat, where the bed is the centrepiece.
• You have the access to get a large base and headboard into the room (or you choose a split or divan base that comes in two parts).

The main trade-offs are room dominance, slightly pricier bedding and tighter delivery access, but if the space is there, few upgrades improve daily comfort as much as a super king.

8. Frames, headboards and getting it upstairs

Both sizes come in the full spread of styles, from slim metal and wooden frames to upholstered, storage and ottoman designs. A few size-specific things are worth knowing before you buy.

First, super king frames and rigid headboards are physically large. If your staircase has a tight turn or a low landing, measure the access route carefully. Divan and ottoman bases that arrive in two halves, or bed frames that flat-pack, are far easier to manoeuvre into an awkward room. Our how to choose a bed frame guide covers the frame types in detail.

Second, think about the footprint the frame adds. Upholstered beds with padded surrounds can add 10 to 15cm to each side beyond the mattress size, which turns a “just-fits” super king into a squeeze. Always plan from the frame’s external dimensions, not the mattress size.

Finally, storage. If floor space is tight because you have gone large on the bed, an ottoman or storage frame reclaims the space you would otherwise lose to a chest of drawers, keeping the room uncluttered. Browse frame options across our king size beds to compare styles side by side.

9. Buying with confidence

Once you have matched the size to your room, buying should be the easy part. At Elystra Living your order is dispatched on fast, tracked delivery, so you can plan for its arrival, and every bed is covered by our 30-day returns policy for genuine peace of mind. If you would like to spread the cost, Klarna interest-free instalments let you pay over time without extra charges. Take a moment to measure your space, decide whether 75cm or a full 90cm each suits you better, then browse our king size beds and the wider bedroom collection to find the frame and mattress that finish your room beautifully.