The length of a short sword can vary depending on the specific type, historical period, and cultural context. There is no universally defined measurement that categorizes a sword as a "short sword." However, as a general guideline, short swords typically have blade lengths ranging from approximately 30 centimeters (12 inches) to 60 centimeters (24 inches).

Short swords are intentionally designed to be shorter than longer weapons like greatswords or longswords. Their shorter length provides advantages in close-quarters combat, indoor environments, or situations where maneuverability is crucial. The compact size allows for better handling and quick strikes in tight spaces.

It's important to note that the categorization of a sword as a "short sword" is relative, as different cultures and historical periods may have their own standards for defining short swords based on their typical weapon designs and combat styles.

Ultimately, the length of a short sword can vary depending on the specific sword type, cultural influence, and historical era. It's always best to refer to specific examples or consult historical sources to get more precise measurements for individual short swords from different regions and time periods.