How Wide Is a King Size Bed? Ireland, UK & US Dimensions

A bed labeled “king” in Ireland is not the same width as a king in the UK or the US, a difference that can turn a confident purchase into a costly mistake. This guide breaks down the exact dimensions for each region so you can buy with confidence.

Irish King width: 150 cm (5’0″) · UK King width: 183 cm (72″) · US King width: 193 cm (76″) · Double bed width (Ireland): 137 cm (4’6″)

The table above shows the region can change the width by over 40 cm, a gap that makes frames, sheets, and furniture non-interchangeable.

What width is a king size bed in Ireland?

Irish King vs UK King

• Irish King: 150 cm wide (5’0″) × 200 cm long (6’6″) — often called a “5-foot bed” (Caseys.ie (Irish furniture retailer))
• UK King: 183 cm wide (6’0″) × 200 cm long (6’6″) — known as the “standard king” in Britain (And So To Bed (UK bed specialist))
• Key difference: The UK king is a full 33 cm (13 inches) wider than the Irish king.

That gap matters more than you’d think. An Irish king mattress will not fit a UK king bed frame, and vice versa. Irish retailer DFi Beds lists the standard Irish king as 150×200 cm, while UK chains like Dreams and John Lewis sell the 183×200 cm version. If you’re ordering online from a UK site for delivery to Ireland, you risk receiving a bed that is 33 cm too wide for your room — or your existing frame.

Standard Irish bed sizes

Four size categories cover most Irish homes. One pattern: every step up adds roughly 13–15 cm in width.

• Single: 91 cm × 191 cm (36″ × 75″) (Dochara)
• Double: 137 cm × 191 cm (4’6″ × 6’3″)
• King: 150 cm × 200 cm (5’0″ × 6’6″)
• Super King: 180 cm × 200 cm (6’0″ × 6’6″) — note that the super king matches the UK king in width (And So To Bed)

The implication: Ireland’s “king” is not the widest domestic option — that’s the super king. For anyone used to a UK or US king, the Irish king can feel cramped as a couple’s bed, closer in width to a US queen (152 cm) than a US king.

How wide is a king size bed in centimeters?

King size width in cm (Ireland)

• Irish King: 150 cm wide
• Irish Super King: 180 cm wide
• Irish Double: 137 cm wide (for context)

Irish retailer Caseys.ie confirms the standard king as “150 cm across by 200 cm long.” The And So To Bed guide aligns, noting that Irish and UK mattress sizes follow a shared tradition except for the king width.

King size width in cm (UK/US)

Three regions, three widths — all measured in the same unit.

The pattern: each step across the Atlantic adds roughly 33 cm in width. A buyer moving from Ireland to the US would go from 150 cm to 193 cm — a 29% increase. That’s enough to change what size bed frame, sheets, and bedroom furniture you need.

Is a king size bed 6 feet wide?

Feet vs centimeters conversion

• 6 feet = 183 cm (exactly)
• UK King: 183 cm wide = 6’0″ — so yes, the UK king is 6 feet wide.
• Irish King: 150 cm = 4’11” wide.
• US King: 193 cm = 6’4″ wide.

Only the UK king lives up to the “6-foot” label. The Irish king falls 13 inches short, and the US king exceeds it by 4 inches. Many shoppers in Ireland mistakenly assume 6 feet because they see “king” and picture a standard UK bed. According to Get Laid Beds, “customers often confuse UK and Irish sizing, especially when ordering online from a UK retailer.”

Why some think king is 6 feet wide

The confusion stems from two sources. First, the US and UK both use “king” as a label, and many online guides assume US dimensions apply globally. Second, Irish retailers sometimes market the super king (180 cm) as “6-foot wide” because it rounds to 5’11” — close enough that customers don’t correct the assumption.

The catch: if you buy a 6-foot-wide king mattress in Ireland expecting a standard fit, you’ll need a super king frame. But a super king frame may not accommodate an Irish king mattress (150 cm) without gaps. Always match the exact width in cm, not the name.

Is a double bed the same as a king in Ireland?

Double bed dimensions in Ireland

• Double: 137 cm wide (4’6″) × 191 cm long (6’3″)
• King: 150 cm wide (5’0″) × 200 cm long (6’6″)
• Difference: The king is 13 cm wider and 9 cm longer.

Dochara notes that the Irish double is the same width as a US full/double (54 inches). So upgrading from a double to a king in Ireland gives you just 13 cm — enough for a bit more elbow room but not enough to turn a single sleeper into a couple’s space.

King vs double comparison

Four key differences between the Irish double and Irish king:

• Width: 137 cm vs 150 cm (+13 cm)
• Length: 191 cm vs 200 cm (+9 cm)
• Surface area: 2.62 m² vs 3.00 m² (+14%)
• Best for: single adults (double) vs couples with average height (king)

The implication: an Irish king is not the massive leap that a US king (76″) represents over a US queen (60″). If you’re used to sharing a US queen, an Irish king will feel similarly snug. For taller couples, the extra 9 cm in length (200 cm vs 191 cm) is a welcome improvement. But for width, the upgrade is modest.

How much bigger is king than queen?

King vs queen dimensions (UK/US)

Queen size presents yet another transatlantic divergence.

Sources: US queen dimension from BedInABox; UK queen from And So To Bed.

Width and length differences

• US: Queen → King adds 41 cm in width (same length at 203 cm). That’s enough space for a small pet or a child to sleep between two adults.
• UK: Queen → King adds 30 cm in width (same length at 200 cm). Less dramatic, but still a meaningful upgrade for shoulder room.
• Ireland: There is no standard queen; the double (137 cm) sits below king. So the jump from double to king is only 13 cm — far smaller than in the US or UK.

The trade-off: Irish buyers who want a wider bed must go straight to super king (180 cm), which is still narrower than a US king (193 cm). For anyone accustomed to US hotel beds, even a UK king can feel undersized.

“A standard Irish King size bed measures 150 cm × 200 cm (5’0″ × 6’6″).”

— DFi Beds (Irish mattress retailer), via product catalogue

“King: 183 cm (72 in) wide.”

— Wikipedia, Bed size (UK dimensions)

“King-size bed dimensions typically are 150 cm across by 200 cm long.”

— Caseys.ie (Irish furniture retailer), Bed size guide

For Irish shoppers, the choice is clear: measure your room and frame in centimeters, not in “king” labels. A UK king (183 cm) will not fit an Irish king frame, and a US king (193 cm) will dominate even a large Irish bedroom. Stick to 150×200 cm for a standard Irish king, or go up to 180×200 cm if you need more width. The same applies to bedding — verify the dimensions on the product page, because “king” alone tells you only that the label is local, not that the size is universal.

For a more detailed breakdown of how these measurements compare, see this guide on king size bed dimensions across regions.

Frequently asked questions

Related reading

• How Many Cups in a Gallon? US & UK Guide — another deep dive into US vs UK measurement confusion.
• Camping World Near Me: Ireland, UK Dealers & Rules — if you’re outfitting a caravan or campervan with a bed, regional size standards matter there too.