10.16cm is equivalent to 4 inches. In the Dutch language, the word “inch” originates from the term for a thumb. Roughly, one inch is about the length of one segment of a thumb, which is approximately 2.54 centimeters. During the 14th century, King Edward II of England established the official standard for the inch. According to the decree, the length of one inch is measured by selecting three of the largest grains of barley from the middle of a barley spike and lining them up in a row.