When choosing a bed, the most important decision you'll make is the size. You hear people say "single," "twin," "full," "queen" and "king," but how do you know what these terms mean? The dimensions below will give you a clearer picture of mattress sizing. According to the Better Sleep Council, an actual bed's dimensions could vary by an inch or so.
A single bed is also known as a twin bed. Its measurements are 90 cm × 190 cm (36 inches by 75 inches). It sleeps one person. Some mattress retailers carry the "European single," which is 10 cm (3 inches) longer than the standard.
A double bed is called a "full" bed in North America. It measures 135 cm (54 inches) wide and 190 cm (75 inches) long. It's designed to sleep two people.
A full bed measures 54 inches wide and 75 inches long. The full bed is also called the double bed. It's designed to sleep two people, though it's just 15 inches wider than a twin.
Queen or King
In the UK a king-size bed is 150 cm × 200 cm (60 inches by 78 inches). In North America this width of mattress is called a "queen."
The UK has three larger sizes of mattress which are also designated as King. You may encounter an extra king, which is 180 cm × 190 cm (72 inches x 75 inches); a super king is 180 cm × 200 cm (72 inches × 78 inches) and an eastern king, which measures 200 cm × 200 cm (78 inches × 78 inches).
Bigger than king
The UK has two mattress sizes that are larger than any of the king-size categories. These are the emperor, which measures 215 cm × 215 cm (84 inches x 84 inches) and the caesar, which is 245 cm × 220 cm (96 inches x 87 inches).