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Musical Interval Calculator

Perfect fifth
7
Semitones
1.498
Ratio

Work out the interval between any two notes. Select a low note and a high note with their octaves and this tool counts the semitones between them, names the interval such as major third or perfect fifth, and shows the frequency ratio in equal temperament. Intervals are the building blocks of chords, scales and melody, and knowing the semitone count makes it easy to transpose a line or spell a voicing. The tool wraps interval names across octaves, so a distance of nineteen semitones reads as a compound fifth and still gives you the raw count. The ratio figure tells you how the two frequencies relate, which is why a perfect fifth of seven semitones sits close to the pure three to two ratio. Change either note and everything updates instantly.

How to use Note Interval Calculator

  1. Pick the first note.
  2. Pick the second note.
  3. Read the interval name, semitone count and ratio.

Frequently asked questions

What does it tell me about two notes?

It names the interval between the two notes, counts the semitones and shows the frequency ratio.

How is the interval named?

The name comes from the number of semitones, for example seven semitones is a perfect fifth and twelve is an octave.

What does the frequency ratio show?

The ratio is how the two pitches relate, so an octave is a two to one ratio and a perfect fifth is close to three to two.

What is Note Interval Calculator?

Work out the interval between any two notes. Select a low note and a high note with their octaves and this tool counts the semitones between them, names the interval such as major third or perfect fifth, and shows the frequency ratio in equal temperament.

Is Note Interval Calculator free to use?

Yes. Note Interval Calculator is completely free, with no sign-up and no usage limits.

Does Note Interval Calculator work in a web browser?

Yes. Note Interval Calculator runs in any modern web browser. There is nothing to download or install.

Is my data private with Note Interval Calculator?

Yes. Note Interval Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.