Shaku (unit)

The shaku (Japanese: 尺) or Japanese foot is a Japanese unit of length derived (but varying) from the Chinese chi, originally based upon the distance measured by a human hand from the tip of the thumb to the tip of the forefinger (compare span). Traditionally, the length varied by location or use, but it is now standardized as 10/33 m, or approximately 30.3 centimeters (11.9 in).