Speech rate(wpm) is the total number of words by the number of minutes your speech took. The speed at which you talk may change the whole meaning of a sentence. Exercise your speaking with speech rate conditions in mind.
Presentations Between 100 - 150 wpm for a comfortable pace
Conversational Between 120 - 150 wpm
Audiobooks Between 150 - 160 wpm, which is the upper range that people comfortably hear and vocalize words