1DCutX support Imperial and Metric measurement systems.
If you want to use the Metric (m, cm, mm) then you don’t need to specify any units at all.
You just have to specify all lengths, saw kerf, trim sizes, etc. in the same units that you prefer.
For example, your project has a part length of 1.2 m, a saw kerf is 4 mm, and a trim size is 7 cm.
If you want to use centimeters (cm) then the part length should be specified as 120, the saw kerf as 0.4 and the trim size as 7.
If you want to use millimetres (mm) then the part length should be specified as 1200, the saw kerf as 4 and trim size as 70.
All measurement in the Imperial system should have units specified by the symbols: ' - feet and " - inches.
Non-integral numbers in that case must be specified only in fractional format (0.5 is 1/2, 2.4 is 2 2/5, etc.).
Examples: 22" (22 inches); 1' (1 foot); 2' 3" (2 feet and 3 inches); 4 2/7" (4 and 2/7 inches); 2' 3 2/5" (2 feet, 3 and 2/5 inches).