1 Semitone Frequency Ratio
One semitone corresponds to a frequency ratio of approximately 1.0595 (the twelfth root of 2).
How to use this tool
- Enter semitones in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your frequency ratio and the full breakdown beneath it.
One semitone is the smallest interval in Western music, with a frequency ratio of the twelfth root of 2, roughly 1.0595.
Frequently asked questions
- What is the frequency ratio of an octave?
- An octave is exactly 12 semitones, corresponding to a frequency ratio of 2:1.
- What is the perfect fifth ratio?
- A perfect fifth is 7 semitones; the equal-temperament ratio is 2^(7/12) ≈ 1.4983.