Metric conversion table.

Inches Millimeters (mm) 1 ⁄ 8 equals 3.2 1 ⁄ 4 equals 6.4 3 ⁄ 8 equals 9.5 1 ⁄ 2 equals 12.7 5 ⁄ 8 equals 15.9 3 ⁄ 4 equals 19.1 7 ⁄ 8 equals 22.2 1 equals 25.4 1 1 ⁄ 4 equals 31.8 1 1 ⁄ 2 equals 38.1 1 3 ⁄ 4 equals 44.5 2 equals 50.8 3 equals 76.2 4 equals 101.6