The width of a wakizashi blade, like that of any sword, can vary depending on the specific sword and its construction. However, on average, the width of a wakizashi blade typically ranges from around 2 to 3 centimeters (0.8 to 1.2 inches) at its widest point.

The width of a wakizashi blade is narrower compared to that of a katana, the longer companion sword. This narrower width allows for greater maneuverability and control in close-quarters combat, which was the primary purpose of the wakizashi.

It's important to note that these measurements are approximate and can vary depending on the individual sword, the blade smith, and historical period. The width can also vary along the length of the blade, with some sections being narrower or wider than others.

If you are considering the overall width of the wakizashi, including the handle (tsuka) and guard (tsuba), it will be wider due to the presence of the handle and fittings.

In summary, the width of a wakizashi blade typically falls within the range of 2 to 3 centimeters (0.8 to 1.2 inches) at its widest point, providing the sword with the necessary balance between agility and cutting power.