This is because its dimensions are a perfect fit for a standard room of average size. Single bed size is approximately 39 inches by 75 inches in US standard mattress sizes.
However, this is not only standard single bed that is available in the market today. There are several other single bed types that are being sold in other parts of the world and the sizes may have a slight difference when measured against the US standard single or twin bed size.
Determining Single Bed Sizes
In the US, there are two other twin or single bed sizes, offering either a wider or longer bed; or both.
The size that comes after the standard single is the extra long single and this measures 39 inches by 80 inches, giving you a bed that is 5 inches longer than the regular single. This size is actually one that is more commonly found in school dormitories.
The three quarter bed is actually a single type as well and this one is wider than a regular single. This measures about 48 inches in width by 75inches in length. Finally, there is the super single, and this is approximately 48 inches in width by 84 inches in length.
The super single is the largest single bed available in the United States.
United Kingdom and Ireland
In these parts of the globe, there are also several single bed types that you can choose from. The standard single here measures about 3 feet wide by 6 feet and 3 inches long.
They have a smaller version which is the small single and the size of this one is about 2 feet and 6 inches wide by 6 feet long. They also have a three quarter version and this one measures about 4 feet in width by 6 feet and 3 inches in length. This bed size is also known as the prince size.
In these parts, there are three basic types of single beds: the extra small single, small single and the large single.
The extra small single measures approximately 30 inches wide by 79 inches long; the small single is about 31 inches wide by 79 inches long; and finally, the large single has measurements of around 39 inches in width by 79 inches in length.
From these measurements, you can see that the large single is closest to the US extra long single.
Norway also has three basic single bed types: small single, single and large single. For the small single, measurements are 30 inches by 79 inches; the single bed is around 35 inches by 79 inches; while the large single is around 47 inches by 79 inches.
You can see that the lengths of all three types are the same. The size variations are determined in their widths.