A standard twin mattress is typically about 75 inches long (around 6 feet 3 inches).

Quick Scoop

  • Standard twin size: 38 inches wide by 75 inches long.
  • In feet: roughly 3.2 feet wide by 6.25 feet long.
  • Twin XL (common variant): same width, but 80 inches long, so 5 inches longer than a regular twin.

So if you’re just wondering “how long is a twin mattress?” the simple answer is: about 75 inches long , unless it’s a Twin XL, which is about 80 inches long.

Extra Details (If You’re Shopping)

  • Works best for: kids, teens, or adults under about 6 feet tall, especially in small rooms or bunk beds.
  • Room size: commonly recommended minimum is around 7 x 9 or 7 x 10 feet for a twin.

A handy way to picture it: if you’re around 5'10", you’ll just about match the length of a standard twin; if you’re taller or like extra toe-room, a Twin XL is usually more comfortable.

Information gathered from public forums or data available on the internet and portrayed here.