I assume it's an UM3. If so, you've two possibilities:
- just measuring the distance between the top of the platform and the bottom of the heat bed with a ruler or similar,
- using one of these: https://www.youmagine.com/designs/um3-buildplate-distance-tool
If it's not an UM3, method 2 doesn't work because of the different shape of the platform.
What guide, for what printer model? Could you post a link? (Most of us providing help here are not Ultimaker employees, and we don't know all guides by heart).
I think the 14 mm is approximate (though I agree it is a weirdly specific number, which is why I would like to see/read the context so I may be able to explain).
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