PLUS RepliCAM supports both metric as well as English units. You can change the units at any time. Go to Settings-> Unit settings. From this you will get dialog box as shown below.
In this dialog box just click on arrow so you will get different type of units like inch, feet, mm, m and etc.
For Units in fractional Inches the units can be input in following ways (say 1/32 is the display precision).
Consider you have to input 6.25 inches. It can be input in one of the following ways
6.25 or 6.25” or 6 1/4 or 6 1/4" or 6 8/32 or 6 8.