Even though your SOLIDWORKS model is set to a specific unit system, this definitely does not hold you back from using other unit systems in your equations. You can enter the unit symbols (i.e. “mm”, “in”, “cm”, “ft”, etc) in both the dimension Modify box as well as in the Equation Editor.
SOLIDWORKS will automatically convert the values from the differing unit systems and calculate. When using different units in equations, the expression will maintain the original value and the multiple unit system for easy modification.
Clik here to view.

Multiple Unit System in an Equation
For example even if the model is all in Metric units, you can still enter Global Variables in Imperial to be used in equations.
Clik here to view.

Units in Global Variables
Multiple Unit Systems Demonstration
Here is a quick video demonstrating this functionality:
Want to learn more about using Equations?
Try our SOLIDWORKS Advanced Update training course for advanced equation management techniques.
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