About the Vocal Range Calculator
This tool measures the span between the lowest and highest notes you can sing, reports the frequency of each note in Hz using standard concert pitch (A4 = 440 Hz), and matches your range against the standard vocal range charts used in music education to suggest the closest voice type.
How the calculation works
Every note in Western music can be written in scientific pitch notation (like E3 or C#5): a note name plus an octave number, where C4 is middle C. Converting a note to a MIDI number uses MIDI = (octave + 1) x 12 + note index, where the note index runs 0 (C) through 11 (B). The calculator uses this to convert your lowest and highest notes into semitone positions, then finds the frequency of each with the equal-temperament formula:
f = 440 x 2^((MIDI - 69) / 12)
This formula fixes A4 (MIDI note 69) at 440 Hz and spaces every semitone by a constant frequency ratio — the twelfth root of two, about 1.05946 — so frequency doubles exactly every 12 semitones (one octave). Your total range is the semitone distance between your highest and lowest notes, divided by 12 to get octaves.
How voice type is estimated
The calculator compares your range against six standard reference ranges commonly used in choral and vocal pedagogy — Bass, Baritone, and Tenor (typically male voices) and Alto/Contralto, Mezzo-Soprano, and Soprano (typically female voices) — and reports whichever reference range overlaps your entered range the most. These reference ranges are approximate and widely published, but real voice classification also depends on vocal timbre (tone color), passaggio (register break) location, and tessitura (where the voice sits most comfortably), not range alone. Two singers with an identical range can still be classified differently by a vocal teacher, so treat the result here as a starting reference point rather than a final verdict.
Reading your result
A useful benchmark: an untrained adult voice typically covers somewhere around 1.5 to 2.5 octaves, while trained singers — especially in classical or musical theater styles — often reach 3 octaves or more. Interestingly, the tenor and alto/contralto reference ranges overlap almost completely, both centered near middle C, which is why an identical absolute range can point to either classification depending on other vocal qualities.