10+ 3/8 Toli In Mm Background. We assume you are converting between inch and millimetre. 3/8 equals how many mm?
Just short of 3/8 inch.
1 mm = 0.03937007874 inch. The british standards institute defined the inch as 25.4mm in 1930 in the document metric units in engineering. To convert mm to inches, multiply the millimeter value by 0.03937007874 or divide by 25.4. Note that rounding errors may occur, so always check the results.