A standard double bed measures approximately 54 inches wide by 75 inches long (about 135 cm by 190 cm). This size is also known as a full bed in the U.S. and is designed to comfortably fit two adults, although the space per person is about 27 inches wide, which can feel a bit cozy for couples. The length is typically 75 inches (6 feet 3 inches), suitable for most adults but possibly short for taller individuals. This size is common for smaller bedrooms or guest rooms. In the UK, a double bed is generally measured as 135 cm wide by 190 cm long, equivalent to 4 feet 6 inches wide and 6 feet 3 inches long, which aligns closely with U.S. sizing. Other related sizes include small double beds (120 cm wide) and king-size beds (150 cm wide) that offer more space for two people.