Foolestroupe: Yes, but you're talking about whole notes in a scale. I was talking about counting frets up the fingerboard.

You quoted me out of context! Note the sentence before the one you quoted: "So how do you know what the "IV" guitar chord will be for any particular "I" guitar chord if you don't know pianos or music theory?"

I was trying to answer that question, which I imagine might be posed by the beginner guitarist, without referring to scales and whole notes and half-notes and the chromatic scale and dominant chords and so forth ad nauseum.