Octave Note Frequencies
List the frequencies of all twelve notes in any octave.
About Octave Note Frequencies
Starting from the C of the chosen octave, every black or white key is a fixed twelfth-root-of-two step higher. A complete note-to-hertz table is a quick reference for tuning synths, checking samples and arranging by ear.
Formula
Octave Note Frequencies
Each note in the octave is the previous times 2^(1/12)
- base
- C of the chosen octave derived from the A4 reference
Worked example
With the default values below, Octave Note Frequencies returns A of 440.00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Octave numberaccepts 0–9
- 4
- A4 tuningaccepts 400–466 Hz
- 440 Hz
Results
- A
- 440.00 Hz
- A#
- 466.16 Hz
- B
- 493.88 Hz
- C
- 261.63 Hz
- C#
- 277.18 Hz
- D
- 293.66 Hz
- D#
- 311.13 Hz
- E
- 329.63 Hz
- F
- 349.23 Hz
- F#
- 369.99 Hz
- G
- 392.00 Hz
- G#
- 415.30 Hz
Step by step
- 1Values used
- 2Octave Note Frequencies
- 3A= 440.00 Hz
- 4A#= 466.16 Hz
- 5B= 493.88 Hz
- 6C= 261.63 Hz
- 7C#= 277.18 Hz
- 8D= 293.66 Hz
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Octave Note Frequencies calculated?
Each note in the octave is the previous times 2^(1/12) Starting from the C of the chosen octave, every black or white key is a fixed twelfth-root-of-two step higher.
Why does Octave Note Frequencies matter?
A complete note-to-hertz table is a quick reference for tuning synths, checking samples and arranging by ear.
What values do I need to enter?
This calculator takes 2 inputs: Octave number, A4 tuning. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.