Other than the children or "crib" bed (about 27 x 52 inches), there are North American versions of the European single that are narrower than the US single (39 x 75 inches):
(converted from metric)
European Extra Small Single - 30 x 79 inches
European Small Single - 31 x 79 inches
A queen size bed
a little smaller than a twin. if not a twin.
A king bed is often said to be the size of two twin beds. A queen bed is smaller than a king by about 16 inches in width. It is 21 inches wider and 5 inches longer than a standard twin bed.
Twin XL or extra long. Same length as a queen bed, but normal width for a twin. Great for tall kids and guest rooms.
A double bed, also known as a full bed, is generally the second-smallest type of mattress. A single bed, which may be known as a twin bed, is smaller than a double bed.
A twin mattress is 75 inches long and 38 inches wide. This is smaller than a double bed, and is considered a bed for a child. Two adults would not fit on a twin size bed.
A twin bed is smaller and made to fit one person. A full bed is made to fit two people, and it's bigger.
A twin size bed is a single bed that is typically 38 inches wide and 75 inches long. It is designed for one person and is smaller than a full or queen size bed. The dimensions may vary slightly depending on the brand or style of the bed.
A youth bed is smaller, meant for kids, while a twin bed is bigger and can be used by both kids and adults.
A bedskirt that is for a smaller size bed will never work. You can however make a larger bedskirt work for a smaller bed with some creative tucking.
A Twin is less wide than Full. A Twin is "3/3", or 3 ft and 3 inches wide, while a Full is a "4/6" or 54" wide. Both are 75" long.
Choosing between a toddler bed or a twin bed depends on the age and size of the child. A toddler bed is smaller and lower to the ground, making it easier for young children to get in and out of. A twin bed is larger and may be more suitable for older children or if space is a consideration.