A standard single bed is 3 feet wide and 6 feet 3 inches long (91 x 190). This is the most common bed size for children, kids beds and bunk beds. A small double bed refers to a 4 feet wide, 6 feet 3 inches long mattress (
122 x 190 cm). This represents a mattress 6 inches narrower than a standard double mattress.Jun 6, 2012
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