A person’s normal speaking voice is 40 to 60 decibels. Decibels are a measure of sound, and they are different for normal speech and loud speech. Normal human speech is 40 to 60 decibels. 1 decibel is the sound that the human ear can just hear, 20 decibels or less, we can assume that the sound is quiet, this range of speech intensity is mostly whispered. Normal human speech belongs to the mixed frequency, the normal voice is usually around 40 decibels, in a low whisper is about 30 decibels, only in the loud speech, will be as high as 60-70 decibels. Some people’s voices are louder because the pitch of their voice is higher, when the decibels of the sound emitted do not exceed the normal range.