
How to read a vocal range chart
Each row on a vocal range chart gives two notes: the lowest and the highest that a trained singer of that voice type can sing with a steady, usable tone. The letter is the note and the number is the octave. Octave numbers go up at every C, so B3 sits directly below C4. Middle C, written C4, is the C nearest the center of a full-size piano.
The frequency column says the same thing in hertz (Hz), the number of vibrations per second. Every octave doubles the frequency: A2 is 110 Hz, A3 is 220 Hz, A4 is 440 Hz and A5 is 880 Hz. That is why the soprano range, C4 to C6, covers 262 to 1,047 Hz, while the bass range, two octaves lower, covers only 82 to 330 Hz.
Notice how much the ranges overlap. All seven voice types share the notes from middle C up to E4, and a tenor and a mezzo-soprano share more than an octave. What separates neighboring voice types is where each voice sounds best and feels easy, not only where it starts and stops.
- Piano key numbers: count from the bottom of an 88-key piano. Key 1 is A0, key 40 is middle C (C4) and key 49 is A4, the 440 Hz tuning note.
- Two octaves each: every range on this chart covers 24 semitones, which is 25 piano keys if you count both ends.
- Sharps and flats: a note such as F#3 or Bb3 is the black key between two white keys. Each step from one key to the next, white or black, is one semitone.




