What makes an odachi different from a katana or tachi?
Updated Feb 2026
An odachi is defined primarily by its exceptional blade length, which typically exceeds 90 cm (roughly 35 inches) and often reaches well over 100 cm. By comparison, a standard tachi averages around 70–80 cm and a katana runs 60–75 cm. This extra length gives the odachi a commanding visual presence that made it historically associated with shrine offerings, ceremonial processions, and displays of aristocratic prestige rather than everyday carry. The extended blade also requires a different hand placement and body posture to display properly, which contributes to its dramatic presentation on a stand or wall mount. For collectors, the sheer scale of an odachi is its defining appeal.