What Is King Size Bed Size?

The Size, Stated Plainly

King size in the UK means a mattress of 150cm by 200cm, which is 5ft wide and 6ft 6in long. It is the second largest standard size in Britain, sitting above the 135cm double and below the 180cm super king.

Beyond the numbers, the more useful question is what that size gives you. It provides 75cm of sleeping width per person for a couple, and 10cm more length than a double. For most adults sharing a bed in an average British main bedroom, that combination is the point at which a bed stops feeling like a compromise.

What 75cm Each Actually Feels Like

Sleeping width is easier to judge against something familiar. A standard single mattress is 90cm wide. On a king, each person has 75cm, so slightly less than a single each. On a double it drops to 67.5cm, and on a super king it rises to 90cm, which is a full single each.

The practical difference shows up in how often you touch. On a double, two average sized adults are in contact most of the night, which matters if one of you moves a lot or sleeps hot. On a king there is room to turn without disturbing the other person. If either of you is broad shouldered, or a dog sleeps on the bed, a super king becomes the more honest choice.

Length is the other half. At 200cm, a king suits sleepers up to around 6ft 4in comfortably. A 190cm double leaves taller people with their feet at the very edge, especially once the duvet is tucked in at the foot.

Who a King Suits

A king works well for couples with a main bedroom of at least 3m by 3.4m, for taller sleepers who need the extra length, and for anyone who has outgrown a double but does not have the floor space for a super king.

It is also a sensible choice for households where children or pets join the bed occasionally. The extra width absorbs a small visitor at six in the morning far better than a double does.

Where a king makes less sense is in a single occupancy room, in a guest room used a few nights a year, or in a bedroom under 3m wide where the walkways will suffer. In those cases a double gives back useful floor space, and a small double gives back more still. Comparing the whole ladder across our modern beds UK range makes the trade off clearer than reading dimensions alone.

Frame Choices at King Size

At 150cm wide, the frame carries more weight and more span, so build quality shows. Look for a central support rail with its own legs, since slats spanning the full width without support will bow in time. Slat spacing should be close enough to satisfy the mattress guarantee, generally no more than about 7cm apart.

Material affects how the bed reads in the room as much as how it performs. Upholstered fabric softens a large frame and suits a calm scheme. Leather has a cleaner line and wipes down easily, which suits busy households, and our modern king size leather beds UK show how a wide frame can still look contained. High gloss finishes reflect light, which helps in a north facing room, and our king size high gloss beds UK demonstrate that effect well. Timber brings warmth and mass, and metal keeps the visual footprint lightest.

Ottoman and drawer bases deserve consideration at this size, because a king base encloses a genuinely large volume underneath. In a house short on cupboard space that area holds spare bedding, suitcases and out of season clothing.

Living With a King in a British Bedroom

A king changes the room’s circulation. Once the frame is in place you are working with roughly 70cm each side in a 3m room, so what sits in those strips has to be narrow. Slim bedside cabinets, wall lights instead of table lamps, and a chest positioned at the foot rather than the side all help.

Wardrobe doors are the usual pinch point. Hinged doors need around 60cm of clear floor to open and be used properly. Where that clashes with the bed, sliding doors solve it, since they need no swing space at all. A tall narrow chest is another useful move, giving the same storage volume as a wide one in half the width. Our modern chest of drawers UK range includes taller designs for exactly this situation.

Bed making is worth a thought too. A king duvet at around 225cm by 220cm is heavy when wet, so if you use a launderette or a compact machine, check the capacity before committing to a larger size.

King Size Around the World

The word king travels badly. A US king is roughly 193cm by 203cm, which is wider than a UK king and closer to a UK super king. A US California king is about 183cm by 213cm, longer but narrower than a US king. European sizes vary by country, with several markets working to 160cm by 200cm and 180cm by 200cm.

This matters when buying bedding online, ordering furniture from an overseas maker, or reading interiors advice written for another market. It also matters when inheriting a bed from abroad, since a mattress bought in the United States will not sit correctly in a UK king frame.

The safe habit is to ignore the name and check the centimetres. We list them clearly on every bed at Furniture in Fashion, along with free delivery to most UK mainland postcodes and returns available up to 30 days.

Getting a King Bed Into the House

The most common regret with a king is not the size in the room but the journey to it. A 150cm mattress will not turn easily on a British staircase with a half landing, and a rigid divan base will not flex at all.

Measure the tightest point on the route, then choose accordingly. A rolled mattress arrives vacuum packed in a box and expands once it is in the bedroom, which removes the problem completely. A zip and link king comes as two 75cm halves that join with a zip and a linking bar, which suits older houses and also lets each sleeper pick their own firmness. A flat packed frame is assembled in the room, so the largest piece to carry is the headboard rather than the whole bed.

Plan the day itself as well. Clear the landing, take pictures off the stairwell wall, and make sure the old bed has already gone. Two king beds in one bedroom is a tight fit even in a large room.

Mattress and Bedding Details at King Size

King mattresses are made in the same constructions as smaller sizes, but two features matter more once a bed is shared. Independent support reduces partner disturbance, which pocket springs and foam both provide in different ways, and edge support keeps the perimeter usable so you are not rolling towards the middle when you sit down to put shoes on.

Depth affects everything above and below. A deep 30cm mattress on a tall divan can push the sleeping surface past 70cm from the floor, which makes getting in and out feel like climbing. It also demands fitted sheets with a deep pocket, and if you add a topper the sheet has to accommodate that too.

UK king duvets are around 225cm by 220cm, which gives good overhang on a 150cm mattress without dragging on the floor. Two single duvets is a workable alternative for couples who disagree about warmth, though on a king they overlap slightly and leave the outer edges thinner. Rotate the mattress end to end every few months to keep it even, and check whether it is single sided before attempting to turn it over.

Frequently Asked Questions

What is king size bed size in feet?

Five feet wide by six feet six inches long, which converts to 150cm by 200cm.

Is a king size bed big enough for two adults?

For most couples, yes. Each person has 75cm of width, which allows movement without disturbing the other. Broader sleepers, or couples who share the bed with a pet, may prefer a super king.

Can a king size bed fit in a 3m by 3m room?

It will fit, leaving roughly 70cm at each side and around 90cm at the foot. That is workable, though it leaves little room for anything wider than a slim bedside cabinet.

What is the difference between a king and a super king?

Width. A king is 150cm and a super king is 180cm, while both are 200cm long. The super king gives each sleeper a full single’s width.

Do king size beds need a special mattress?

No special construction is required, but the mattress must be made in the 150cm by 200cm UK king size. Check the depth as well, since deep mattresses need deeper fitted sheets and raise the overall height of the bed.