Modern manufacturing conventions have resulted in a limited number of standard sizes of commercial bedding for mattresses and box springs. They vary by country of origin.
| N. America | Australia | UK / Ireland | Europe / Latin America | |
|---|---|---|---|---|
| Twin / single | 39 in × 75 in 99 cm × 191 cm |
36 in × 75 in 91 cm × 191 cm |
35 in × 79 in 90 cm × 200 cm |
|
| Full / double | 54 in × 75 in 137 cm × 191 cm |
55 in × 79 in 140 cm × 200 cm |
||
| (US/Aus) queen (UK/Ire) king |
60 in × 80 in 152 cm × 203 cm |
60 in × 78 in 152 cm × 198 cm |
63 in × 79 in 160 cm × 200 cm |
|
| (US/Aus) king (UK/Ire) super king |
76 in × 80 in 193 cm × 203 cm (California king 72 in × 84 in 180 cm × 210 cm) |
72 in × 80 in 183 cm × 203 cm |
72 in × 78 in 183 cm × 198 cm |
71 in × 79 in 180 cm × 200 cm |
The sizes in the UK and Ireland, other than the double, vary compared to the US sizes, being generally smaller. The US queen corresponds to UK king, and king to super king. The European or continental basic sizes are similar to the UK but have a set length of 200 centimetres. The terms queen, king and super king are not used in continental Europe, and double refers to 140 cm or any higher width. Instead of these US/UK denominations, the bed width is given in centimetres.
These dimensions are for the mattress—the actual bed frame will be a little bigger in order to fully encompass and support the mattress. The thickness of the mattress may vary considerably.
Most UK bed sizes are available in various lengths between 75 and 87 inches (190–220 cm) in 3-inch (7.6 cm) increments
Modern continental Europe practice is to refer to a bed by explicit width or size ("80 cm bed" or "80 × 200 cm bed"). Other sizes found include:
In France, Spain and Mexico, the length of older beds is sometimes 190 centimetres instead of 200.
In Italy, beds are classified by width:
Most mattress sizes in the Netherlands are also available in extra long, meaning 220 cm instead of 200 cm.
In the Scandinavian countries, standards vary from one country to another. In Norway, these sizes are used:
Beds/mattresses are often available also in extra long (220 cm or 87 in length). Some older beds are only 190 cm (75 in) long, while antique beds often are even shorter (since they in older times often slept in a reclined position rather than the close to supine position which is common today, and also, on average, people are taller now than they used to be).
The following bed sizes are available in New Zealand:
