What defines a Japanese odachi sword and how large is it?
Updated Feb 2026
A Japanese odachi is defined primarily by its exceptional blade length, which substantially exceeds the standard katana dimensions that most collectors are familiar with. A conventional katana has an overall length of roughly 38 to 42 inches with a blade of 27 to 30 inches. A Japanese odachi is considerably larger across all dimensions - blade lengths of 35 inches or more are typical, with overall lengths that can range from approximately 55 to 65 inches or more depending on handle and fitting configuration. This scale difference is immediately and dramatically apparent when an odachi and a katana are placed in proximity: the odachi dominates the visual space in a way that makes the katana appear compact by comparison. Beyond length, the Japanese odachi shares the curved single-edged blade profile and traditional fitting conventions of the Japanese sword tradition, including a tsuba guard, ito-wrapped handle, and matching lacquered saya scabbard. Full-tang construction throughout the handle is a quality standard across all pieces in this collection.