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To convert 3/8 inch from a fraction to a decimal, divide the numerator 3 by the denominator 8 to get a decimal inch of 0.375 inches. Since there are 25.4 mm in an inch, multiplying 0.375 inches by 25.4 gives us the answer in decimal inches to millimeters. Learn how to convert 3/8 inch to millimeters (mm) with a simple two-step process. See the answer, the math, and the converter for other fractional inches. How long is 3 ⁄ 8 inches? How far is three eighths of an inch in millimeters? 3 ⁄ 8 in to mm conversion. 3 ⁄ 8 of a inch is equal to about 9.53 millimeters. An inch is a unit of length equal to exactly 2.54 centimeters. There are 12 inches in a foot, and 36 inches in a yard. How many mm is 3 3/8 inches? Convert 3 3/8 inches to mm. Here you can easily find the answer and calculate how to convert 3 3/8 inches to millimeters.