Convert semitones to octaves
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Ranges, ± tolerances, feet/inches and clock durations work in the value field.
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Show this value in all 10 ratio & decibels units
- Ratios × 1.059 463 094 36
- Decibel (power)s dB 0.250 858 329 72
- Decibel (amplitude)s dB 0.501 716 659 44
- Bels B 0.025 085 832 972
- Nepers Np 0.057 762 265 046 7
- Decades dec 0.025 085 832 972
- Octaves oct 0.083 333 333 333 3
- Semitones st 1
- Cents ¢ 100
- Stop (photographic)s EV 0.083 333 333 333 3
Every row is Semitone (st) converted through the ratio, in exact rational arithmetic.
How to convert semitones to octaves
Convert through a plain ratio: semitone → ratio → octave. Logarithmic units cannot be converted by multiplying alone.
Semitone: Twelve-tone equal temperament: each semitone is the twelfth root of two.
Octave: A factor of two — in frequency, or in light as a photographic stop.
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 |
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 |
Frequently asked
How many octaves are in a semitone?
One semitone equals 0.08333333333 octaves (st → oct).
How do you convert semitones to octaves?
Convert through a plain ratio: semitone → ratio → octave. Logarithmic units cannot be converted by multiplying alone.
What is 1 oct in semitones?
One octave is 12 semitones.
What is 10 st in oct?
10 st = 0.833 333 33 oct.
What exactly is a semitone?
Twelve-tone equal temperament: each semitone is the twelfth root of two.
What exactly is a octave?
A factor of two — in frequency, or in light as a photographic stop.