Revit API MEP Units & Conversion

Does anyone know of a comprehensive list of the units used with in the Revit API and/or know of any useful conversion tools in any of the packages?

I’m writing a script to input mechanical load information to families within the model but am struggling to work out the base unit in some cases.I’m not totally comfortable fudging it to get the value I’m looking for…



"You can determine any internal database unit by setting the value of a given parameter using it on some Revit element to a specific number, e.g. 1.0, in the user interface.

You can then use RevitLookup to examine the parameter’s resulting underlying database value." – From

This post also gives clues:

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Thanks truevis. That’s really useful.