A typical hosomaki sushi roll has about what diameter?

A typical hosomaki sushi roll is about 2.5 centimetres in diameter.

Hosomaki means “thin roll” in Japanese and is made with a relatively small amount of sushi rice and usually one principal filling, such as cucumber, tuna, or pickled daikon. The nori sheet is rolled tightly around the rice and filling, producing a slender cylinder that is easy to cut into bite-sized pieces.

The exact size can vary slightly with the restaurant, rolling technique, and amount of filling; references commonly describe hosomaki as roughly 2 to 2.5 centimetres across. That makes 2.5 centimetres the best single answer for a typical quiz question. It is much narrower than futomaki, the “thick roll,” which generally contains more rice and several fillings. The length of a roll is a separate measurement and should not be confused with its diameter.