A tanto is a traditional Japanese dagger or short sword. The blade length of a tanto typically falls under 12 inches (30 centimeters).

The exact length of a tanto can vary based on the specific sword and individual preferences, but it is generally shorter than both the wakizashi and the katana. The shorter blade length of a tanto allows for close-quarters combat and more precise, intricate movements.

Historically, tanto blades were used for various purposes, including self-defense, stabbing, and utility tasks. They were often worn as a secondary weapon by samurai, alongside the katana and wakizashi.

It's important to note that the measurements provided are approximate and can vary between individual tanto swords due to variations in historical examples, regional traditions, and personal tastes of sword owners or collectors.

In summary, the blade length of a tanto typically falls under 12 inches (30 centimeters), making it shorter than both the wakizashi and the katana. The tanto serves as a dagger or short sword, providing close-quarters combat capabilities and versatility in various tasks.