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Musical Interval Calculator

Enter two notes to name the interval between them, from the spelled letters and the semitone distance.

A letter A–G, up to two ♯ or ♭, and an optional octave: C4, F#3, B♭5, Bbb2. The octave defaults to 4.

The name follows the written letters, so C♯ to F is a diminished fourth while D♭ to F, the same four semitones, is a major third. Everything is calculated in your browser; nothing is sent or stored.