Convert octaves to semitones
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Show this value in all 10 ratio & decibels units
- Ratios × 2
- Decibel (power)s dB 3.010 299 956 64
- Decibel (amplitude)s dB 6.020 599 913 28
- Bels B 0.301 029 995 664
- Nepers Np 0.693 147 180 56
- Decades dec 0.301 029 995 664
- Octaves oct 1
- Semitones st 12
- Cents ¢ 1200
- Stop (photographic)s EV 1
Every row is Octave (oct) converted through the ratio, in exact rational arithmetic.
How to convert octaves to semitones
Convert through a plain ratio: octave → ratio → semitone. Logarithmic units cannot be converted by multiplying alone.
Octave: A factor of two — in frequency, or in light as a photographic stop.
Semitone: Twelve-tone equal temperament: each semitone is the twelfth root of two.
Octave to Semitone conversion table
| Octaves (oct) | Semitones (st) |
|---|---|
| 0 oct | 0 |
| 1 oct | 12 |
| 2 oct | 24 |
| 3 oct | 36 |
| 6 oct | 72 |
| 10 oct | 120 |
| 20 oct | 240 |
| 30 oct | 360 |
| 40 oct | 480 |
| 60 oct | 720 |
| 80 oct | 960 |
| 100 oct | 1200 |
Semitone to Octave conversion table
| Semitones (st) | Octaves (oct) |
|---|---|
| 0 st | 0 |
| 1 st | 0.083 333 333 |
| 2 st | 0.166 666 67 |
| 3 st | 0.25 |
| 6 st | 0.5 |
| 10 st | 0.833 333 33 |
| 20 st | 1.666 666 7 |
| 30 st | 2.5 |
| 40 st | 3.333 333 3 |
| 60 st | 5 |
| 80 st | 6.666 666 7 |
| 100 st | 8.333 333 3 |
Frequently asked
How many semitones are in a octave?
One octave equals 12 semitones (oct → st).
How do you convert octaves to semitones?
Convert through a plain ratio: octave → ratio → semitone. Logarithmic units cannot be converted by multiplying alone.
What is 1 st in octaves?
One semitone is 0.08333333333 octaves.
What is 10 oct in st?
10 oct = 120 st.
What exactly is a octave?
A factor of two — in frequency, or in light as a photographic stop.
What exactly is a semitone?
Twelve-tone equal temperament: each semitone is the twelfth root of two.