The UFC Octagon is typically 30 feet across inside, with about 750 square feet of fighting space. Some events also use a smaller 25-foot version.

Quick scoop

  • Standard Octagon: 30 feet across inside.
  • Area: about 750 square feet.
  • Fence height: roughly 5 feet 9 inches to 6 feet.
  • Small Octagon: 25 feet across, used at some venues like the UFC APEX.

If you want, I can also give you the size in meters or a side-by-side table of standard vs. small Octagon.