Millimeter to Inch Conversion Chart (most commonly used)

Millimeters..................Inches

25.4 ...........................1
95.25 ........................3.75
98 ............................3.86
100............................3.94
101.6...........................4
107.95........................4.25
110............................4.33
112............................4.41
114.3..........................4.5
120............................4.72
120.65........................4.75
127.............................5
130...........................5.12
135...........................5.31
139.7.........................5.5
165.1.........................6.5
170...........................6.69

Here's a calculator too.

http://calculator-converter.com/mm_to_inch_millimeters_to_inches_conversion.php

Just remember to multiply inches by 25.4 or divide mm by 25.4 & it's not too hard.