With PaneCutter you can work with any unit (millimeter, inch, etc.) and you can use fractional numbers as well. With a simple click you can switch between decimal and fractional mode. In fractional mode you can enter the dimensions as fractions (like 5” 3/32), the software will make any conversion and calculation for you and on the result the dimensions will be displayed on the same format.
The latest PaneCutter version is 1.5
Try PaneCutter to make sure yourself
that this is the cutting optimization software you are looking for.