🎹 Music Transposition Calculator
Choose a starting note and octave, and enter how many semitones to transpose, to find the resulting note and frequency.
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How transposition works
Transposing a note by N semitones shifts its position on the 12-tone chromatic scale by N steps, wrapping around into the next or previous octave whenever the shift crosses a C. This calculator finds the new note name using modular arithmetic on the 12-note scale, then computes its frequency with the equal temperament formula referenced to A4 = 440 Hz.
A positive semitone value transposes up in pitch; a negative value transposes down.
Last reviewed August 2026