A jian is a traditional Chinese double-edged straight sword. The length of a jian can vary depending on the specific design and historical period. On average, a jian typically has a blade length ranging from 28 to 31 inches (70 to 80 centimeters).

The jian is known for its elegant and balanced design, emphasizing precision and agility in combat. Its relatively shorter blade length compared to other swords allows for quick, precise strikes and versatile handling.

It's important to note that the measurements provided are approximate and can vary between individual jian swords due to variations in design, historical examples, regional traditions, and personal preferences.

In summary, the blade length of a jian typically falls within the range of 28 to 31 inches (70 to 80 centimeters), making it a relatively shorter sword. The jian's design prioritizes speed, precision, and agility in combat, and it holds an important place in Chinese martial arts and historical contexts.