4 Semitones (Major Third) Frequency Ratio
Four semitones form a major third, with a frequency ratio of approximately 1.2599.
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.
The major third is 4 semitones and has a frequency ratio close to the pure 5:4 ratio used in just intonation.
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.