Inch — millimeter, conversion tables Calculated: 1 inch (in) = 25.4 millimeters (mm) (exact), see DIN 4890. The numerical values in tables 1 to 5 are exact values.
DIN 4892:1975 history
2018DIN 1301-3:2018 Units - Part 3: Conversion of non-SI units
1975DIN 4892:1975 Inch - Millimetre; Conversion Tables