About this tool
Enter two notes (like C4 and G4) and instantly see the interval name, semitone distance, cents and frequency ratio, computed with 12-tone equal temperament (A4 = 440 Hz) in your browser.
Frequently asked questions
How do I enter notes?
Use a letter A–G, an optional # or b accidental, then an octave number, for example C4, F#3 or Bb5.
What tuning is used?
12-tone equal temperament with A4 fixed at 440 Hz, so each semitone is exactly 100 cents.