Male singers are not generally classified by the extremes of the vocal register; rather, they are classified specifically in terms of the timbre of the voice in connection to the strongest note sets (generally, these are diagnosed using basic five-note major scale patterns).
To summarize the findings of Richard Miller, however, the general determination of vocal tessitura for males is based on the first and second passaggi. This would be determined using both five-note scales and basic measure of both the falsetto register and a determination of the points of the voce mista (or voix mixte, if you prefer the French).
In any case, you cannot really make the determination on your own. One tool you CAN use is, to sing a rising chromatic scale until your voice is forced to change to falsetto (this is usually at the second passaggio for younger singers), then to reverse course, starting higher, and singing in falsetto down until your voice is forced to change to "chest" (normally the first passaggio, with some caveats).
One can then generally make a determination between those two pitches as to the general and specific tessitura of the voice.