Note Frequency Chart
The frequency of every note from C0 to B8 in hertz, for A4 = 440 Hz or any other A, and the nearest note to a frequency in cents.
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Nearest note
E4
- Frequency of that note
- 329.63 Hz
- Deviation
- 2.0 cents sharp
- MIDI note number
- 64
| Note | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|---|
| C | 16.35 | 32.70 | 65.41 | 130.81 | 261.63 | 523.25 | 1,046.50 | 2,093.00 | 4,186.01 |
| C♯ / D♭ | 17.32 | 34.65 | 69.30 | 138.59 | 277.18 | 554.37 | 1,108.73 | 2,217.46 | 4,434.92 |
| D | 18.35 | 36.71 | 73.42 | 146.83 | 293.66 | 587.33 | 1,174.66 | 2,349.32 | 4,698.64 |
| D♯ / E♭ | 19.45 | 38.89 | 77.78 | 155.56 | 311.13 | 622.25 | 1,244.51 | 2,489.02 | 4,978.03 |
| E | 20.60 | 41.20 | 82.41 | 164.81 | 329.63 | 659.26 | 1,318.51 | 2,637.02 | 5,274.04 |
| F | 21.83 | 43.65 | 87.31 | 174.61 | 349.23 | 698.46 | 1,396.91 | 2,793.83 | 5,587.65 |
| F♯ / G♭ | 23.12 | 46.25 | 92.50 | 185.00 | 369.99 | 739.99 | 1,479.98 | 2,959.96 | 5,919.91 |
| G | 24.50 | 49.00 | 98.00 | 196.00 | 392.00 | 783.99 | 1,567.98 | 3,135.96 | 6,271.93 |
| G♯ / A♭ | 25.96 | 51.91 | 103.83 | 207.65 | 415.30 | 830.61 | 1,661.22 | 3,322.44 | 6,644.88 |
| A | 27.50 | 55.00 | 110.00 | 220.00 | 440.00 | 880.00 | 1,760.00 | 3,520.00 | 7,040.00 |
| A♯ / B♭ | 29.14 | 58.27 | 116.54 | 233.08 | 466.16 | 932.33 | 1,864.66 | 3,729.31 | 7,458.62 |
| B | 30.87 | 61.74 | 123.47 | 246.94 | 493.88 | 987.77 | 1,975.53 | 3,951.07 | 7,902.13 |
The frequency of every note from C0 to B8, in equal temperament, for the reference A you tune to. Enter a frequency and this names the nearest note and how many cents sharp or flat the frequency is.
How it works
Equal temperament divides the octave into twelve equal semitones. Each one multiplies the frequency by the twelfth root of two, about 1.0595, so twelve of them double it: A4 is 440 Hz, A5 880 Hz, A3 220 Hz.
Every note is counted from the reference A4. A note n semitones above it is the reference times 2 to the power n ÷ 12.
A cent is a hundredth of a semitone. The deviation is 1,200 times the base-2 logarithm of the frequency divided by the nearest note's, and it is never more than 50 either way.
Octaves are numbered the scientific way: each starts on C, middle C is C4 and the A above it is A4. Music software does not all agree — some, Yamaha among them, call middle C C3 — and French tradition numbers one lower too, so the same A is called La3 there.
Examples
| Case | Input | Result |
|---|---|---|
| A string slightly sharp | 330 Hz, A4 = 440 Hz | E4 (329.63 Hz), 2.0 cents sharp |
| Middle C | C4, A4 = 440 Hz | 261.63 Hz |
| Baroque pitch | A4 = 415 Hz | Every note about a semitone lower: A4 at 415 Hz is within 2 cents of G♯4 at 440 Hz |
Frequently asked questions
What is the frequency of middle C?
261.63 Hz, with A4 tuned to 440 Hz. Middle C is C4, nine semitones below A4.
Why is A 440 Hz?
It is a convention, not a law of acoustics. ISO 16 fixes 440 Hz as the standard tuning frequency, but some orchestras tune a little higher and early-music ensembles lower, which is why the reference here can be changed.
What range does a piano cover?
A standard 88-key piano runs from A0 at 27.5 Hz to C8 at 4,186.01 Hz, both at A4 = 440 Hz.
Good to know
- Equal temperament only. Just intonation and historical temperaments tune some intervals differently — a just major third is 13.7 cents narrower than an equal-tempered one — and are not computed here.