§ Metric conversion table. Inches Millimeters(mm) 1/16 equals 1.6 1/8 equals 3.2 3/16 equals 4.8 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 11/8 equals 28.6 21/8 equals 54.0 21/4 equals 57.2 23/8 equals 60.3 21/2 equals 63.5 23/4 equals 69.9 Cubic Inches Cubic Centimeters (cc) 2100 equals 34,412.7 2900 equals 47,522.3 Pounds Grams (g) 10 equals 4,536.0 37 equals 16,783.2 40 equals 18,144.0