Super King Size Bed: Dimen ion , Compari on & Buying Guide
Choosing a bed size often comes down to one question: how much space do you really need? In Ireland and the UK, the super king—at 180 cm by 200 cm — is the largest standard option, but it isn’t the same as US king sizes.
Width: 180 cm (6 ft) · Length: 200 cm (6 ft 6 in) · Area: 3.6 m² · Standard region: UK and Ireland
Quick snapshot
- Super king bed dimensions are 180 cm × 200 cm (Homeline Furniture)
- King XL (USA) is 193 cm × 203 cm (Dochara)
- California king is 183 cm × 213 cm (Dochara)
- UK king is 150 cm × 200 cm (Homeline Furniture)
- Whether some retailers label custom sizes as super king (Dochara)
- Exact prevalence of super king beds in Ireland vs UK (Dochara)
- Room labels in Irish accommodation do not always map directly to bed size (Dochara)
- Standard super king dimensions have remained unchanged for decades — no recent shifts in Irish or UK sizing (Dreams Ireland)
- Measure your bedroom, check doorways for delivery, and compare US sizes before ordering (FloBeds)
Eight bed sizes across markets, one pattern: the super king is the Irish/UK champion for width but falls short of US oversized options.
| Specification | Value |
|---|---|
| Width | 180 cm (6 ft) |
| Length | 200 cm (6 ft 6 in) |
| Common name | 6 ft super king |
| Standard region | UK and Ireland |
| Area | 3.6 m² |
| Difference from UK king | 30 cm extra width (150 cm → 180 cm) |
| Difference from US King XL | Smaller: 180 cm × 200 cm vs 193 cm × 203 cm |
| Mattress thickness (typical) | 20–30 cm (derived from standard profile) |
The implication: Irish and UK buyers get the largest standard footprint, but if space is extreme, US King XL or a custom size may suit better.
What size is a super size king bed?
The super king bed is exactly 180 cm wide by 200 cm long in Ireland and the UK — a specification confirmed by multiple retailers across the island.
- Is 180×200 a super king? Yes. Homeline Furniture lists the super king at 180 cm × 200 cm (Dreams Ireland), and Dreams Ireland’s size guide matches exactly (Homeline Furniture).
- Is 180×200 king or queen? Neither. The Irish king is 150 cm × 200 cm, and the small double is 120 cm × 190 cm (Dreams Ireland). A 180 cm width is unique to the super king.
The exact numbers
The super king, also called a 6 ft bed, offers 3.6 m² of sleeping surface. That’s 20 % more width than a standard king — enough to stop elbows colliding at night.
- Width: 180 cm (71 in)
- Length: 200 cm (79 in)
- Area: 3.6 m²
The pattern is clear: always verify the 180 cm width, as it is the defining feature of the super king.
Are super king and King XL the same size?
No — they are similar in concept but different in measurement. The US King XL (sometimes called Eastern King) is 76 in × 80 in (193 cm × 203 cm), while the UK/Irish super king is 71 in × 79 in (180 cm × 200 cm).
- King XL is 13 cm wider and 3 cm longer than super king (Dochara).
- Bed-in-a-Box advises converting both to inches before comparing (BedInABox).
If you import a King XL mattress to Ireland, you’ll need a custom frame. Standard Irish sheets won’t fit.
Exact differences at a glance
A quick comparison of the two ‘big’ sizes side by side.
| Size | Width | Length | Area |
|---|---|---|---|
| Super king (UK/IRL) | 180 cm (71 in) | 200 cm (79 in) | 3.6 m² |
| King XL (US) | 193 cm (76 in) | 203 cm (80 in) | 3.9 m² |
Why this matters: King XL is larger overall, but availability in Ireland is limited. Most Her Majesty’s bed frames are built for super king dimensions.
Is a California king the same as a super king?
No — the California king is longer but narrower. It measures 72 in × 84 in (183 cm × 213 cm), making it 13 cm longer but 3 cm narrower than the super king (Dochara).
- California king: 183 cm wide, 213 cm long
- Super king: 180 cm wide, 200 cm long
- Trade-off: California king suits tall couples (extra length) but is tighter on shoulder room.
Irish shoppers often confuse the two names. A California king requires a much longer room — check your bedroom length before committing.
The implication: if you need extra length, California king is the choice; if width matters more, super king wins.
What is bigger, a king or a super king?
The super king is bigger. It is 30 cm wider than a UK/Irish king (150 cm → 180 cm) while both are 200 cm long (Dreams Ireland). That extra width translates to about 30 % more shoulder room per person.
Is there a bigger size than super king?
Yes, but only in the US and Canada. Standard larger sizes include Alberta King (193 cm × 203 cm), Wyoming King (193 cm × 203 cm), and Texas King (203 cm × 203 cm) (Get Laid Beds). In Ireland, the super king remains the largest standard size you can buy off the shelf.
Here’s a comparison of the largest standard bed sizes across regions.
| Size name | Width | Length | Standard region |
|---|---|---|---|
| Super king (UK/IRL) | 180 cm | 200 cm | UK & Ireland |
| UK king | 150 cm | 200 cm | UK & Ireland |
| US King XL (Eastern) | 193 cm | 203 cm | USA |
| California king | 183 cm | 213 cm | USA |
| Alberta / Wyoming king | 193 cm | 203 cm | Canada / USA |
| Texas king | 203 cm | 203 cm | USA |
The pattern: Ireland and the UK cap out at 180 cm wide. If you truly need more than that, you’re looking at an import or a custom build.
What is the biggest size bed you can get?
The largest standard bed sizes on the market are the Wyoming King (193 cm × 203 cm), Texas King (203 cm × 203 cm), and Alberta King (193 cm × 203 cm) (Get Laid Beds). Custom sizes can be larger, but standard Irish/UK retailers only go up to super king.
- Super king is the largest widely available size in Ireland (Dreams Ireland).
- For extreme width, custom mattress makers can produce any dimension.
What this means: if you want a size bigger than 180 cm wide, you’ll need to shop overseas or commission a custom build.
What size bed is 240×220?
240 cm × 220 cm is not a standard bed size. It is an oversized custom dimension, roughly 20 % wider and 10 % longer than a super king. Such a mattress would require a bespoke frame, custom sheet sets, and a very large bedroom.
- No major Irish retailer stocks 240 × 220 as a standard line.
- If you see this dimension advertised, it’s likely a special order from a specialist maker.
A 240 × 220 bed offers maximum sleeping space, but you’ll pay a premium for the frame, mattress, and bedding — and moving it through a standard door may be impossible.
The catch: even if you have the room for a 240 × 220, logistics and cost often make it impractical for most Irish homes.
Upsides and downsides of a super king bed
Upsides
- Generous width for couples — no more tug-of-war with the duvet
- Standard bedding widely available in Ireland and the UK
- Fits most standard bedrooms (room should be at least 12 ft × 12 ft)
- Highest resale value of any standard size
Downsides
- Requires significantly more floor space than a king (area 3.6 m² vs 3.0 m²)
- Heavier mattress — more difficult to turn or move (FloBeds)
- Often more expensive — expect a 20-30% premium over king
- Sheet and duvet sizes differ from US standards, causing confusion for online shoppers
Confirmed facts and what remains unclear
Confirmed facts
- Super king dimensions: 180 cm × 200 cm (Homeline Furniture)
- King XL (US): 193 cm × 203 cm (Dochara)
- California king: 183 cm × 213 cm (Dochara)
- UK king: 150 cm × 200 cm (Dreams Ireland)
What’s unclear
- Some retailers may use the term super king for slightly different custom sizes.
- Room labels in Irish B&Bs (e.g. “king room”) sometimes contain a super king bed — no universal mapping exists (Dochara).
- Irish vs UK naming conventions: UK king is 153 cm × 198 cm whereas Irish king is 150 cm × 200 cm, adding potential confusion.
What experts say: quotes on super king beds
“Super king is the largest standard size available in Ireland.”
— Homeline Furniture (Irish furniture retailer) Source
“The super king offers 180 by 200 cm of sleeping surface, providing ample room for two adults.”
— Dreams Ireland (mattress specialist) Source
The trade-off: both retailers confirm the standard size, but neither addresses the confusion with US names. That’s where the real buying risk lies.
If you’re looking for a super king bed size guide, you’ll find the exact 180×200 cm measurements used across Ireland and the UK.
Frequently asked questions
What size sheets do I need for a super king bed?
You need super king size sheets, typically 180 cm × 200 cm. Always check the label — some imported sets are designed for US King XL and won’t fit properly.
Are super king beds more expensive than king?
Yes, expect a 20–30 % price premium over a UK king of similar quality. The difference includes more material and often a stronger frame.
Can I use a super king mattress on a standard frame?
Only if the frame is specifically built for 180 cm × 200 cm. A standard king frame (150 cm wide) will leave the mattress unsupported.
How much room space do I need for a super king bed?
Minimum room size is about 3 m × 3.5 m (10 ft × 12 ft) to allow for a bedside table and walking space. FloBeds recommends leaving at least 60 cm on each side.
What is the best material for a super king bed frame?
Solid hardwood or a metal slatted frame offers the best support for a heavy super king mattress. Avoid flimsy particleboard — it tends to sag over time.
Do I need a special mattress protector for super king?
Any super king size protector will fit, but check that it’s deep enough for thicker mattresses (25 cm+). A fitted sheet with elastic corners works best.
For Irish shoppers, the decision is clear: measure your room, compare with US King XL dimensions, and buy from a retailer that clearly states 180 cm × 200 cm. That way, you get the biggest standard bed available without the headache of a misfit.
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