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Free · A4 = 440 Hz

Note frequency chart

The frequency of every note in hertz, from C0 to B8, in standard tuning. Find a note’s frequency or the note for a frequency, and hear it.

A4 =
A4440 HzThe tuning note, A4

Equal temperament, the tuning of a piano and of almost all music: each note is the twelfth root of two higher than the one below.

Every note’s frequency

In hertz, with A4 at 440 Hz, an octave to a table. A piano runs from A0 (27.5 Hz) to C8 (4,186.01 Hz); middle C is C4.

Octave 0

Note frequencies in octave 0, in hertz
NoteHz
C016.35
C♯017.32
D018.35
D♯019.45
E020.6
F021.83
F♯023.12
G024.5
G♯025.96
A027.5
A♯029.14
B030.87

Octave 1

Note frequencies in octave 1, in hertz
NoteHz
C132.7
C♯134.65
D136.71
D♯138.89
E141.2
F143.65
F♯146.25
G149
G♯151.91
A155
A♯158.27
B161.74

Octave 2

Note frequencies in octave 2, in hertz
NoteHz
C265.41
C♯269.3
D273.42
D♯277.78
E282.41
F287.31
F♯292.5
G298
G♯2103.83
A2110
A♯2116.54
B2123.47

Octave 3

Note frequencies in octave 3, in hertz
NoteHz
C3130.81
C♯3138.59
D3146.83
D♯3155.56
E3164.81
F3174.61
F♯3185
G3196
G♯3207.65
A3220
A♯3233.08
B3246.94

Octave 4

Note frequencies in octave 4, in hertz
NoteHz
C4 · middle C261.63
C♯4277.18
D4293.66
D♯4311.13
E4329.63
F4349.23
F♯4369.99
G4392
G♯4415.3
A4 · A440440
A♯4466.16
B4493.88

Octave 5

Note frequencies in octave 5, in hertz
NoteHz
C5523.25
C♯5554.37
D5587.33
D♯5622.25
E5659.26
F5698.46
F♯5739.99
G5783.99
G♯5830.61
A5880
A♯5932.33
B5987.77

Octave 6

Note frequencies in octave 6, in hertz
NoteHz
C61046.5
C♯61108.73
D61174.66
D♯61244.51
E61318.51
F61396.91
F♯61479.98
G61567.98
G♯61661.22
A61760
A♯61864.66
B61975.53

Octave 7

Note frequencies in octave 7, in hertz
NoteHz
C72093
C♯72217.46
D72349.32
D♯72489.02
E72637.02
F72793.83
F♯72959.96
G73135.96
G♯73322.44
A73520
A♯73729.31
B73951.07

Octave 8

Note frequencies in octave 8, in hertz
NoteHz
C84186.01
C♯84434.92
D84698.64
D♯84978.03
E85274.04
F85587.65
F♯85919.91
G86271.93
G♯86644.88
A87040
A♯87458.62
B87902.13

How to work out a note’s frequency

Every number in the chart comes from one note and one ratio.

Start from A4 = 440 Hz

The A above middle C is the note every other is worked out from, so a tuner and a piano agree.

Each semitone: × 1.0595

A semitone up multiplies the frequency by the twelfth root of 2, about 1.0595: A♯4 is 440 × 1.0595 = 466.16 Hz.

Each octave: × 2

Twelve semitones double it: A5 is 880 Hz and A3 is 220 Hz, the same note higher and lower.

Any note: 440 × 2^(n ÷ 12)

Where n is how many semitones the note is from A4, below as a minus. Middle C is 9 below: 440 × 2^(−9 ÷ 12) = 261.63 Hz.

Guitar and bass string frequencies

In standard tuning, from the lowest string. A bass’s four strings are an octave under the guitar’s lowest four.

Guitar

Guitar string frequencies in standard tuning
StringNoteFrequency
6E282.41 Hz
5A2110 Hz
4D3146.83 Hz
3G3196 Hz
2B3246.94 Hz
1E4329.63 Hz

Bass

Bass string frequencies in standard tuning
StringNoteFrequency
4E141.2 Hz
3A155 Hz
2D273.42 Hz
1G298 Hz

Middle C, A440 and 432 Hz

Middle C frequency

C4, 261.63 Hz: where it is, and why some apps call it C3 or C5.

A440: the 440 Hz tuning note

Why most music tunes A4 to 440 Hz, and who tunes higher.

432 Hz vs 440 Hz

Every note 31.77 cents lower: hear both, and what the claims say.

Questions about note frequencies

What is a note’s frequency?

How many times a second its sound wave repeats, in hertz (Hz). A4 repeats 440 times a second; the higher the frequency, the higher the note.

How do you work out a note’s frequency?

Count the semitones from A4, n, up or down, and work out 440 × 2^(n ÷ 12). Middle C is 9 semitones below: 440 × 2^(−9 ÷ 12) = 261.63 Hz.

Why does an octave double the frequency?

A note an octave up repeats exactly twice as often: A3 is 220 Hz, A4 440 and A5 880. That is why the two sound like the same note, higher.

What are the lowest and highest notes on a piano?

A0 at 27.5 Hz and C8 at 4,186.01 Hz, the 88 keys between them.

What are the guitar string frequencies?

In standard tuning, low to high: E2 82.41 Hz, A2 110 Hz, D3 146.83 Hz, G3 196 Hz, B3 246.94 Hz, E4 329.63 Hz.

What is a cent?

A hundredth of a semitone. A tuner shows how many cents sharp (high) or flat (low) a note is; a few cents off is hard to hear.

Play the notes in a beat

Open the free editor and every note is a key on its piano roll. Drums, bass, chords and a melody, each its own part.

Start a beatPiano chords

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