Using the Galaxy-class ship as an example, I took the 195.26 meters height and divided by 42. The answer is a little long, rounded to 4.65 meters each deck. Then converted metric to english, 1 meter = 3.28 feet. I get 15.25 feet. That's too high, and when we see the crew walking through the corridors it looks more like 7 feet or 7.5 ft. The rest of the space that 8 ft could have crawlspace for jefferies tubes and support, along with circuitry, etc.
This still seems inconsistant, and the question of standard deck height unanswered. I brought this up because I thought some one here might know.
Hobbes
9906.25
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Federation Starship Datalink
Got Trek?
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Brain: "Are you pondering what I'm pondering?"
Pinky: "I think so, Brain, but, if you get a long little doggie, wouldn't you just call it a 'dachshund'?"
Boris
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"Wrong again. Although we want to be scientifically accurate, we've found that selection of [Photon Energy Plasma Scientifically Inaccurate as a major Star Trek format error] usually indicates a preoccupation with science and gadgetry over people and story."
---a Writers' Test from the Original Series Writer's Guide
Seriously: most decks are between 3 and 4m high, depending on what you put in between them.
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Okay, who put a "stop payment" on my reality check?