18edo

This page or section is a work in progress. It may lack sufficient justification, content, or organization, and is subject to future overhaul.

18edo, or 18 equal divisions of the octave, is the equal tuning featuring steps of (1200/18) ~= 66.7 cents, 18 of which stack to the octave 2/1.

With the sharp fifth 733.3c and the flat fifth 666.7c, 18edo is often considered the quintessential straddle-3 edo and the straddle-3 version of 12edo.