I have played guitar for so long in standard A-440 that certain chords are forever ingrained in my brain. I can listen to a note then compare it to one of the chords in my head and tell you what note it is. For example if I start with a G-chord in my head and I hear a B note I will recognize it as the major 3rd and know that that note would be a B. I think that's what someone meant by doing the math. I do not believe that is perfect pitch, though.
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Music washes away from the soul the dust of everyday life.
-Berthold Auerbach
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