When using formulas in your Revit Families, it can sometimes be troublesome when you are using other parameters to drive formulas that contain different unit types.
For example, if you are creating a parameter that is a number type and you are using a Length Parameter in the formula. The result will be an error ‘Inconsistent Units’
To get these formulas to work, in the formula, just divide the Length Parameter by 1 (the ‘mm’ will automatically appear). Then you will get the correct result.
This process works with other types of Parameter types that use units…..