By traditional Japanese classification, a nodachi must have a blade length exceeding approximately 35 inches, measured from the tip to the base of the tang. This distinguishes it from the standard katana, which typically measures between 24 and 30 inches, and from the odachi, a closely related term sometimes used interchangeably. The extended length creates a longer cutting arc and a dramatically different balance profile compared to shorter sword forms. Collectors should note that nodachi blades in this range — some reaching 47 inches — require a correspondingly longer saya and specific display hardware to present the piece correctly. The sheer scale is a large part of what makes the nodachi so visually arresting as a display collectible.