Note name
A
Octave
4 (1-line)
Frequency
440
Hz

This note frequency calculator is a convenient tool to determine the frequency of musical notes tuned in the twelve-tone equal temperament. In the text, you'll find the note frequency chart and a guide on how to use the note frequency converter.

We'll also cover the basics of the physics of sound - if you want to learn more about it, check out our relevant calculators:

The frequency of musical notes

Sound is a wave which travels through a medium, such as air or water. All sounds consist of sine waves with different frequencies and amplitudes. Amplitude determines volume, and frequency determines pitch.

Technically, frequency is the number of completed wave cycles per second, and is expressed in Hertz. For example the frequency of the musical note C4 is approximately 262 Hz. This means the sound wave has 262 cycles per second.

Picture of high and low frequency waves

Musical notes have determined frequencies. For example, in the twelve-tone equal temperament (the most common tuning system since the 18th century), note A4 has a frequency of 420 Hz.

If one note is double the frequency of another, they sound similar, so we designate them with the same letter. We then add a number to represent the octave - that is to say whether we mean a higher or lower D.

This way of representing musical notes if called the scientific pitch notation.

How to use the note frequency calculator

  1. Choose the name of the note. Note pairs like F♯ and G♭, or C♯ and D♭, are enharmonic equivalents, which means they denote the same sound.

  2. Choose an octave.

  3. By default, the calculator rounds the frequency of the musical note to one decimal place. You can change it in the advanced mode (below the note frequency calculator).

The note frequency chart

Below you can see a table with the rounded frequencies of musical notes in Hertz:

Octave / Note
0
1
2
3
4
5
6
7
8
C
16
33
65
131
262
523
1047
2093
4186
C♯
17
35
69
139
277
554
1109
2217
4435
D
18
37
73
147
294
587
1175
2349
4699
D♯
19
39
78
156
311
622
1245
2489
4978
E
21
41
82
165
330
659
1319
2637
5274
F
22
44
87
175
349
698
1397
2794
5588
F♯
23
46
93
185
370
740
1480
2960
5920
G
25
49
98
196
392
784
1568
3136
6272
G♯
26
52
104
208
415
831
1661
3322
6645
A
28
55
110
220
440
880
1760
3520
7040
A♯
29
58
117
233
466
932
1865
3729
7459
B
31
62
123
247
494
988
1976
3951
7902
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