1 inch is equal to about 3.33 centimeters, 1 inch = 2.54 centimeters, so the inch is bigger than the inch. "The inch is the traditional Chinese unit of length, and "feet", "zhang" for decimal, 10 inch = 1 foot, 10 feet = 1 zhang. In Korea, it is used to indicate the amount of relationship between relatives, e.g. 1 inch indicates the relationship between 2 generations of the direct line. Hong Kong law follows the ancient system (1 inch = 3.33 centimeters), but this unit has almost no one in Hong Kong to use, and will only use "inches" and "centimeters".

Inch (inch, abbreviated as in.) in the Dutch language in the original meaning of the thumb, an inch is the bottom of the fingernail is the width of the average person's thumb. Of course, the width of the human thumb is also the length of the 14th century, King Edward II promulgated the "standard legal inch". Its provisions are: from the middle of the barley spike to select the three largest grains of wheat and in order to form a line of length is one inch.