Somebody on Tumblr posted this —
Feminine Voice Range:
311.1 - 196.0 hz
(D#4 - G3 Musical Notes)
Gender-ambiguous Voice Range:
187.0 - 153.6 hz
(F#3 - D#3 Musical Notes)
Masculine Voice Range:
146.8 - 92.5 hz
(D3 - F#2 Musical Notes)
If you want to measure your voice in hertz, there's a $0.99 app for iPhone called Voice Counter Pro, and there is a free computer software application called PRAAT Phonetics Software.
Pre-T trans guys who are curious about how their voice will sound —
A log of personal voice changes on T by week was also included in the post:
Week 0: 175 hz
Week 1: 165 hz
Week 2: 149 hz
Week 3: 137 hz
Week 4: 125 hz
Week 5: 112 hz
Week 6: 113 hz
Week 7: 103 hz
Week 8: 89 hz
Some on this site have said that the voice overall ends up dropping about an octave, which is your current voice frequency divided by 2.
I hope this was helpful to some of you!
-N
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