Ultimately, no, not really, these formats are built to be "render-agnostic", and there's really no way to pre-calculate aspects of what the render will be without actually running it through the rendering engine. Which is, in theory, doable, without having to send the render output to an actual screen or printer, but the followup problem is that all renderers are not created equal. I.E. an engine for rendering a docx that you grab from NuGet or somewhere else is not guaranteed to produce the same output as what Microsoft Word will, not exactly.

If you need accuracy in predicting the rendered-size of various things, you really need to be running the documents through the same renderer that will be used to actually print/draw the documents for the user. If this is Microsoft Office, you can look into Office Interop protocols, which will let you make programmatic calls into the actual Office programs installed on the system, from your program. There ought to be a way to kick off rendering from there.