A twin size mattress is 39 x 75 inches. So it is 39 inches wide. However, if you are thinking about buying a comforter for your mattress I would suggest getting it in size 68x86.
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North American-size twin bed mattress is: 39 x 75 inches
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.
One twin mattress is 39 inches wide and 75 inches long. One twin XL mattress is 39 inches wide and 80 inches long. A standard king size mattress is 76 inches wide and 80 inches long. So technically two regular twin mattresses don't exactly equal a king size mattress because they are too short by 5 inches. Two extra long twin mattresses make a more accurately sized king size bed. In a pinch you could put them sideways and sleep across the king bed.
Yes. Twin XL bedding measures approximately 38 inches wide by 80 inches long. A king bed frame is designed to support bedding that measures 76 inches wide by 80 inches long.
The height of a twin mattress can vary from 6 to 18 inches (15 to 45 centimeters) high.