US, UK and French sizes · inches and cm

Bed size chart

In the US, a Queen mattress is 60 × 80 in (152.4 × 203.2 cm), a King is 76 × 80 in and a California King is 72 × 84 in. In the UK, beds are labelled in centimetres: a Double is 135 × 190 cm, a King 150 × 200 cm and a Super King 180 × 200 cm. The same name can mean a different size in each country, so every size below is given in inches and centimetres, with the source that publishes it.

US mattress sizes

Size	Inches	Centimetres
Twin	39 × 75 inor 38 × 75 in	99.1 × 190.5 cmor 96.5 × 190.5 cm
Twin XL	39 × 80 inor 38 × 80 in	99.1 × 203.2 cmor 96.5 × 203.2 cm
Full	54 × 75 inor 54 × 74 in	137.2 × 190.5 cmor 137.2 × 188 cm
Queen	60 × 80 in	152.4 × 203.2 cm
King	76 × 80 in	193 × 203.2 cm
California King	72 × 84 in	182.9 × 213.4 cm

First figure: Target mattress size chart. * Second figure: Sleep Foundation, where it differs. Both checked 2026-09-24.

UK mattress sizes

Size	Centimetres	Inches
Small Single2ft 6in × 6ft 3in	75 × 190 cm	29.5 × 74.8 in
Single3ft × 6ft 3in	90 × 190 cm	35.4 × 74.8 in
Euro Single3ft × 6ft 6in	90 × 200 cm	35.4 × 78.7 in
Small Double4ft × 6ft 3in	120 × 190 cm	47.2 × 74.8 in
Double4ft 6in × 6ft 3in	135 × 190 cm	53.1 × 74.8 in
Euro Double4ft 7in × 6ft 6in	140 × 200 cm	55.1 × 78.7 in
King5ft × 6ft 6in	150 × 200 cm	59.1 × 78.7 in
Euro King5ft 3in × 6ft 6in	160 × 200 cm	63 × 78.7 in
Super King6ft × 6ft 6in	180 × 200 cm	70.9 × 78.7 in
Emperor6ft 6in × 6ft 6in	200 × 200 cm	78.7 × 78.7 in

Sizes in centimetres, feet and inches: Which? UK mattress size guide, checked 2026-09-24. The National Bed Federation lists the same figures for the six standard sizes and notes that the metric sizes are rounded equivalents of the feet-and-inches sizes, not exact conversions. Inches are our conversion (1 in = 2.54 cm).

By Rai AnsarUpdated 24 September 2026Figures checked against their sources on 24 September 2026

Drafted with AI assistance from the cited sources; every number comes from our dated, sourced dataset. How this site is made.

What we found

US sources do not agree on three sizes

Target lists Twin and Twin XL as 39 in wide; Sleep Foundation's twin guide lists 38 in. For Full, the same Sleep Foundation guide gives 54 × 74 in, while its own double-bed guide and Target both give 54 × 75 in. We show both figures instead of averaging them into a number nobody publishes. Measure the mattress you are actually buying.

Read on 2026-09-24: Target chart, Sleep Foundation twin guide, Sleep Foundation double guide.

Compare any two sizes

Pick two sizes from any market. Both are drawn to the same scale from the chart's figures.

First sizeSecond size

Units

US Queen: 60 in × 80 in (solid outline)
UK King: 59.1 in × 78.7 in (dashed outline)

Width difference (second vs first)−0.9 in
Length difference (second vs first)−1.3 in
Surface area33.3 sq ft vs 32.3 sq ft (−3.1%)

Queen, King and Double are not one size worldwide

The same name is used for different measurements in different markets. Each chart below is drawn from the dataset behind this page; we compare sizes by measurement, never by name.

"Queen": Three markets, three different sizes for the same word. US Queen = 152.4 × 203.2 cm; UK queen-size (Small Double) = 120 × 190 cm; French queen size = 160 × 200 cm. Sources: Target mattress size chart, Which? UK mattress size guide, IKEA France size guide.

"King": A US King is wider than both a UK King and a French "king size". US King = 193 × 203.2 cm; UK King = 150 × 200 cm; French king size = 180 × 200 cm. Sources: Target mattress size chart, Which? UK mattress size guide, IKEA France size guide.

"Double": A US Full (Double) is 54 × 75 in. A UK Double is designed as 4ft 6in × 6ft 3in, the same 54 × 75 in, but sold under the metric label 135 × 190 cm. US Full/Double = 137.2 × 190.5 cm; UK Double = 135 × 190 cm. Sources: Sleep Foundation double bed guide, Which? UK mattress size guide.

French mattress sizes

In France, beds are sold in centimetres. These are the standard sizes IKEA France lists; they are not an EU-wide standard. More on the French bed sizes page.

Size	Centimetres	Inches
1 placeSingle 90 × 190	90 × 190 cm	35.4 × 74.8 in
1 placeSingle 90 × 200	90 × 200 cm	35.4 × 78.7 in
2 placesDouble 140 × 190	140 × 190 cm	55.1 × 74.8 in
2 placesDouble 140 × 200	140 × 200 cm	55.1 × 78.7 in
queen sizeQueen 160 × 200	160 × 200 cm	63 × 78.7 in
king sizeKing 180 × 200	180 × 200 cm	70.9 × 78.7 in

Source: IKEA France mattress size guide (in French), checked 2026-09-24.

Before you buy: three measurements a size name does not give you

The mattress itself.
Use the seller's width, length and depth for that exact product. Even two major US references differ by an inch on Twin width.
The frame's outer footprint.
A frame is larger than its mattress. An IKEA MALM Queen frame takes up 66⅛ × 83⅛ in of floor space for the 59⅞ × 79½ in mattress IKEA says it holds. See bed frame dimensions.
The mattress depth, for fitted sheets.
A fitted sheet has to match the mattress's depth, not just its width and length. See fitted sheet pocket depth.

Sources

Target mattress size chartUS market · retailer chart · checked 2026-09-24
Sleep Foundation twin size guideUS market · editorial reference · checked 2026-09-24
Sleep Foundation double bed guideUS market · editorial reference · checked 2026-09-24
Sleep Foundation single vs twinUS market · editorial reference · checked 2026-09-24
IKEA US MALM bed frame (Queen)US market · manufacturer product page · checked 2026-09-24
Which? UK mattress size guideUK market · consumer guide · checked 2026-09-24
IKEA France size guideFR market · retailer chart · checked 2026-09-24

Sources are grouped by the market they are written for. Each figure was checked against its source on the date shown.