Convert from span to shaku

Unit Definition (span)
Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.

Unit Definition (shaku)
The shaku is a Japanese word meaning "measure" or "scale", also used for several traditional units in Japan: [1] As a unit of distance, the shaku is the Japanese foot, equal to about 30.30 centimeters or 11.93 inches; [2] As a unit of area, the shaku equals 330.6 square centimeters (51.24 square inches); [3] As a unit of volume, the shaku equals about 18.04 milliliters (0.61 U.S. fluid ounce).