A standard full (also called double) mattress is about 54 inches wide by 75 inches long (roughly 137 cm by 191 cm).

Quick Scoop

  • Typical full mattress size: 54" W × 75" L.
  • In centimeters: about 137 cm × 191 cm.
  • Often marketed as “full” or “double” — these terms are usually the same size in the U.S.
  • Frames are slightly bigger (often around 56–59" wide and 77–80" long) to fit the mattress and hardware.

How it compares to other beds

  • Wider than a twin (38" × 75"), so one sleeper gets more elbow room.
  • Narrower than a queen (60" × 80"), so two adults will fit, but it’s cozy.

Tiny “story” to picture it

Imagine taping off a rectangle on your floor that’s 4.5 feet wide and a bit over 6 feet long — that’s about the footprint of a full bed.

If you’ve ever slept in a basic “double” bed in an older guest room or dorm- style setup, that was almost certainly this size.

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