Interval Calculator
Pick two notes, spelled with sharps or flats, to find the correct interval name between them, its inversion and its sound.
About this tool
The interval is calculated ascending from the first note to the second. Its name depends on how the notes are spelled, not just how far apart they sound: C up to F♯ is an augmented 4th and C up to G♭ is a diminished 5th, even though both are six semitones (a tritone). Likewise C to E♭ is a minor 3rd, but C to D♯ is an augmented 2nd. That’s why you choose notes by name here, including sharps and flats, and the tool counts the letters as well as the semitones.
Choose “an extra octave” for compound intervals such as a 9th, 10th or 13th, which are used to name extended chords. The result also shows the inversion: flip any interval upside down and the numbers add up to 9 (a 3rd becomes a 6th), major becomes minor, and perfect stays perfect. Press play to hear the two notes one after the other and then together.