The size of a standard single bed can vary depending on the country and region. However, in the United States, a standard single bed is typically 38 inches wide and 75 inches long. In other parts of the world, single beds can range from 80 cm x 200 cm (31 in x 79 in) to 100 cm x 220 cm (39 in x 87 in) . It is important to note that single beds and twin beds have the same dimensions, so these terms are often used interchangeably.