A Guide to Bed Size Dimensions

By Maria Ramos
Last Updated: January 28, 2018

The good news: Bed size dimensions are usually based on mattress sizes; in fact, in the UK, bed size actually refers to mattress size. This makes it automatically easier to pick out a bed frame, box spring, foundation or platform bed to match your mattress. However, if you’re looking at bed sizes to get exact measurements for a space requirement, remember to add a few inches on each side. These support products can sometimes be wider and longer because of functional or design purposes. Also keep in mind that mattress thickness can vary considerably; mattress size only refers to width and length.

The bad news: Standard sizes vary from country to country. Even more confusing is the fact that some countries use the same terminology for differing dimensions. For instance, a queen-sized mattress is 60 inches by 80 inches—or 152 centimeters by 203 centimeters—in both the US and Canada. In Australia it is slightly wider; in continental Europe it’s much wider and slightly shorter; and in addition to that, there are more than three other countries that define the queen size differently. There are also highly specific sizes that you’ll be hard pressed to find internationally, such as the North American non-standard queen sizes, which we’ll go into more detail later.

While the lack of a global standard when it comes to bed sizes may not be a problem for most people, it can be a point of confusion for immigrants and expats—or even overseas vacationers who might buy beddings to take home with them. Size mixups are particularly bothersome when it comes to fitted sheets. Below we’ll go through some common terminologies and run through the dimensions that define them in different locations; especially the US and Canada, the UK and Ireland, Australia, and continental Europe. We’ll show the measurements in both inches and centimeters, too; worth noting here that the Imperial system notation will be more exact for the US and Canada, but for the rest it’s best to stick to the metric system.


The Single or Twin

US & CanadaUK & IrelandAustraliaEurope
Imperial38in x 75in35in x 75in36in x 74in35in x 79in
Metric97cm x 191cm90cm x 190cm92cm x 187cm90cm x 200cm

This is one of the most common and widely used bed size terms worldwide, which is why it’s so important to note the small differences. In addition to the dimensions above, there are also various Asian ones. For example: In comparison to the US single or twin, Japan’s is two inches longer; Taiwan’s is four inches wider but slightly shorter; Singapore’s is a little narrower.

Some non-standard sizes similar to the US single or twin include the US small single or cot at eight inches narrower, and the US twin XL at five inches longer.


The Double or Full

US & CanadaUK & IrelandAustraliaEurope
Imperial53in x 75in53in x 75in54in x 74in55in x 79in
Metric135cm x 191cm135cm x 190cm137cm x 187cm140cm x 200cm

Double or full beds—usually the smallest that can comfortably fit two people—suffer from little to no variation in actual measurements when you compare the standards of three of the four biggest markets. Thailand’s double or full mattress is much narrower than the US full size at about 48 inches, but comes very close to the extreme length of continental Europe’s, with barely an inch of difference. Taiwan’s is again a little shorter, but as wide as a US queen size.

In the US, there’s also the standard US small double or three-quarter at 10 inches wider; as well as the non-standard full XL—like the twin XL, it adds five inches to the mattress length.


The Queen

US & CanadaUK & IrelandAustraliaEurope
Imperial60in x 80inN.A.60in x 80in63in x 79in
Metric152cm x 203cmN.A.153 x 203cm160cm x 200cm

Apart from the reality that queen size mattresses are the most popular these days—typically used as the display size as well as the basis of a mattress type’s advertised price—two other facts are worth pointing out here: One is that the North American and Australian queen sizes might as well be identical, with a mere centimeter of difference that’s lost when rounding down the converted measurement. The other is that a UK queen size does not exist, but the UK king size is curiously closer to the US queen size than it is to the US king size, as we will see later on.

Adding to the possible confusion is the fact that there are three North American non-standard queen sizes, and one of them is even known by three different names. The super, Olympic or expanded queen size is six inches wider than the US standard; while the California queen is four inches longer. The split queen—a mattress specifically for use with adjustable bed bases—is actually the same size as the US standard, but it’s split into two parts each measuring 30 inches wide. Split mattresses of a larger size may also be available, but they may not be as easy to find as the split queen.


Still frame from the official music video of Rihanna’s California King Bed

The King

US & CanadaUK & IrelandAustraliaEurope
Imperial76in x 80in59in x 79in72in x 80in71in x 79in
Metric193cm x 203cm150cm x 200cm183cm x 203cm180cm x 200cm

For most markets, the king size is the largest standard mattress size, and therefore the most spacious and luxurious. As previously noted and as seen here, the UK king size is closer to the US queen; a more comparable UK mattress measurement to the other king sizes is the UK super king, which has exactly the same dimensions as the Euro king and the standard Swedish double bed. It’s also worth mentioning that in many Asian countries, their respective king sizes—mostly slightly smaller than the US standard—tend to be their biggest mattress sizes, too.This is hardly the case in the US. The standard US California king is a little narrower but a little longer than the normal US king; and while the much harder to find, the non-standard US Texas king or grand king is huge at 80 inches by 98 inches.