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

Quick Scoop

  • Width: about 54 inches (4.5 feet).
  • Length: about 75 inches (6.25 feet).
  • In centimeters: about 137 cm by 191 cm.
  • Typical full bed frame footprint: roughly 56–60 inches wide and 76–80 inches long, since frames stick out a bit past the mattress.

So in everyday terms, a full size bed is comfy for one adult who wants more room than a twin, and can fit two people if you don’t mind being close.

Size vs other common beds

Bed size Dimensions (W × L) How it compares to full
Twin 38″ × 75″ Narrower than full by about 16″, same length.
Full (Double) 54″ × 75″ Baseline here.
Queen 60″ × 80″ About 6″ wider and 5″ longer than full.
[9][7][5]

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