We hope this common ruler will help you in figuring out millimeters

Millimeters  (mm)	Inches  (in)
12 mm	1/2 "
20 mm	4/5 "
25 mm	1"
30 mm	1 1/5"
35 mm	1 3/8"
40 mm	1 3/5"
45 mm	1 3/4"
50 mm	2"
60 mm	2 2/5"
70 mm	2 4/5"
80 mm	3 1/5"
90 mm	3 1/2"
100 mm	4"
125 mm	5"
150 mm	6"
mm  (x)  .0392 = inches	1 inch  =  25.5 mm