Table shows frequencies of music notes in twelve-tone equal tempered system (12-TET). Both basic tone and up to three harmonic frequencies are presented.

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Note frequencies#

MIDI number	Note [US]	Note [PL/DE]	Basic tone [Hz]	1-st harmonic [Hz]	2-nd harmonic [Hz]	3-rd harmonic [Hz]
0	C_-1	C_-1	8.18	16.35	24.53	32.7
1	C♯_-1 / D♭_-1	C♯_-1 / D♭_-1	8.66	17.32	25.99	34.65
2	D_-1	D_-1	9.18	18.35	27.53	36.71
3	D♯_-1 / E♭_-1	D♯_-1 / E♭_-1	9.72	19.45	29.17	38.89
4	E_-1	E_-1	10.3	20.6	30.9	41.2
5	F_-1	F_-1	10.91	21.83	32.74	43.65
6	F♯_-1 / G♭_-1	F♯_-1 / G♭_-1	11.56	23.12	34.69	46.25
7	G_-1	G_-1	12.25	24.5	36.75	49
8	G♯_-1 / A♭_-1	G♯_-1 / A♭_-1	12.98	25.96	38.93	51.91
9	A_-1	A_-1	13.75	27.5	41.25	55
10	A♯_-1 / B♭_-1	B_-1	14.57	29.14	43.7	58.27
11	B_-1	H_-1	15.43	30.87	46.3	61.74
12	C₀	C₀	16.35	32.7	49.05	65.41
13	C♯₀ / D♭₀	C♯₀ / D♭₀	17.32	34.65	51.97	69.3
14	D₀	D₀	18.35	36.71	55.06	73.42
15	D♯₀ / E♭₀	D♯₀ / E♭₀	19.45	38.89	58.34	77.78
16	E₀	E₀	20.6	41.2	61.81	82.41
17	F₀	F₀	21.83	43.65	65.48	87.31
18	F♯₀ / G♭₀	F♯₀ / G♭₀	23.12	46.25	69.37	92.5
19	G₀	G₀	24.5	49	73.5	98
20	G♯₀ / A♭₀	G♯₀ / A♭₀	25.96	51.91	77.87	103.83
21	A₀	A₀	27.5	55	82.5	110
22	A♯₀ / B♭₀	B₀	29.14	58.27	87.41	116.54
23	B₀	H₀	30.87	61.74	92.6	123.47
24	C₁	C₁	32.7	65.41	98.11	130.81
25	C♯₁ / D♭₁	C♯₁ / D♭₁	34.65	69.3	103.94	138.59
26	D₁	D₁	36.71	73.42	110.12	146.83
27	D♯₁ / E♭₁	D♯₁ / E♭₁	38.89	77.78	116.67	155.56
28	E₁	E₁	41.2	82.41	123.61	164.81
29	F₁	F₁	43.65	87.31	130.96	174.61
30	F♯₁ / G♭₁	F♯₁ / G♭₁	46.25	92.5	138.75	185
31	G₁	G₁	49	98	147	196
32	G♯₁ / A♭₁	G♯₁ / A♭₁	51.91	103.83	155.74	207.65
33	A₁	A₁	55	110	165	220
34	A♯₁ / B♭₁	B₁	58.27	116.54	174.81	233.08
35	B₁	H₁	61.74	123.47	185.21	246.94
36	C₂	C₂	65.41	130.81	196.22	261.63
37	C♯₂ / D♭₂	C♯₂ / D♭₂	69.3	138.59	207.89	277.18
38	D₂	D₂	73.42	146.83	220.25	293.66
39	D♯₂ / E♭₂	D♯₂ / E♭₂	77.78	155.56	233.35	311.13
40	E₂	E₂	82.41	164.81	247.22	329.63
41	F₂	F₂	87.31	174.61	261.92	349.23
42	F♯₂ / G♭₂	F♯₂ / G♭₂	92.5	185	277.5	369.99
43	G₂	G₂	98	196	294	392
44	G♯₂ / A♭₂	G♯₂ / A♭₂	103.83	207.65	311.48	415.3
45	A₂	A₂	110	220	330	440
46	A♯₂ / B♭₂	B₂	116.54	233.08	349.62	466.16
47	B₂	H₂	123.47	246.94	370.41	493.88
48	C₃	C₃	130.81	261.63	392.44	523.25
49	C♯₃ / D♭₃	C♯₃ / D♭₃	138.59	277.18	415.77	554.37
50	D₃	D₃	146.83	293.66	440.5	587.33
51	D♯₃ / E♭₃	D♯₃ / E♭₃	155.56	311.13	466.69	622.25
52	E₃	E₃	164.81	329.63	494.44	659.26
53	F₃	F₃	174.61	349.23	523.84	698.46
54	F♯₃ / G♭₃	F♯₃ / G♭₃	185	369.99	554.99	739.99
55	G₃	G₃	196	392	587.99	783.99
56	G♯₃ / A♭₃	G♯₃ / A♭₃	207.65	415.3	622.96	830.61
57	A₃	A₃	220	440	660	880
58	A♯₃ / B♭₃	B₃	233.08	466.16	699.25	932.33
59	B₃	H₃	246.94	493.88	740.82	987.77
60	C₄	C₄	261.63	523.25	784.88	1046.5
61	C♯₄ / D♭₄	C♯₄ / D♭₄	277.18	554.37	831.55	1108.73
62	D₄	D₄	293.66	587.33	880.99	1174.66
63	D♯₄ / E♭₄	D♯₄ / E♭₄	311.13	622.25	933.38	1244.51
64	E₄	E₄	329.63	659.26	988.88	1318.51
65	F₄	F₄	349.23	698.46	1047.68	1396.91
66	F♯₄ / G♭₄	F♯₄ / G♭₄	369.99	739.99	1109.98	1479.98
67	G₄	G₄	392	783.99	1175.99	1567.98
68	G♯₄ / A♭₄	G♯₄ / A♭₄	415.3	830.61	1245.91	1661.22
69	A₄	A₄	440	880	1320	1760
70	A♯₄ / B♭₄	B₄	466.16	932.33	1398.49	1864.66
71	B₄	H₄	493.88	987.77	1481.65	1975.53
72	C₅	C₅	523.25	1046.5	1569.75	2093
73	C♯₅ / D♭₅	C♯₅ / D♭₅	554.37	1108.73	1663.1	2217.46
74	D₅	D₅	587.33	1174.66	1761.99	2349.32
75	D♯₅ / E♭₅	D♯₅ / E♭₅	622.25	1244.51	1866.76	2489.02
76	E₅	E₅	659.26	1318.51	1977.77	2637.02
77	F₅	F₅	698.46	1396.91	2095.37	2793.83
78	F♯₅ / G♭₅	F♯₅ / G♭₅	739.99	1479.98	2219.97	2959.96
79	G₅	G₅	783.99	1567.98	2351.97	3135.96
80	G♯₅ / A♭₅	G♯₅ / A♭₅	830.61	1661.22	2491.83	3322.44
81	A₅	A₅	880	1760	2640	3520
82	A♯₅ / B♭₅	B₅	932.33	1864.66	2796.98	3729.31
83	B₅	H₅	987.77	1975.53	2963.3	3951.07
84	C₆	C₆	1046.5	2093	3139.51	4186.01
85	C♯₆ / D♭₆	C♯₆ / D♭₆	1108.73	2217.46	3326.19	4434.92
86	D₆	D₆	1174.66	2349.32	3523.98	4698.64
87	D♯₆ / E♭₆	D♯₆ / E♭₆	1244.51	2489.02	3733.52	4978.03
88	E₆	E₆	1318.51	2637.02	3955.53	5274.04
89	F₆	F₆	1396.91	2793.83	4190.74	5587.65
90	F♯₆ / G♭₆	F♯₆ / G♭₆	1479.98	2959.96	4439.93	5919.91
91	G₆	G₆	1567.98	3135.96	4703.95	6271.93
92	G♯₆ / A♭₆	G♯₆ / A♭₆	1661.22	3322.44	4983.66	6644.88
93	A₆	A₆	1760	3520	5280	7040
94	A♯₆ / B♭₆	B₆	1864.66	3729.31	5593.97	7458.62
95	B₆	H₆	1975.53	3951.07	5926.6	7902.13
96	C₇	C₇	2093	4186.01	6279.01	8372.02
97	C♯₇ / D♭₇	C♯₇ / D♭₇	2217.46	4434.92	6652.38	8869.84
98	D₇	D₇	2349.32	4698.64	7047.95	9397.27
99	D♯₇ / E♭₇	D♯₇ / E♭₇	2489.02	4978.03	7467.05	9956.06
100	E₇	E₇	2637.02	5274.04	7911.06	10548.08
101	F₇	F₇	2793.83	5587.65	8381.48	11175.3
102	F♯₇ / G♭₇	F♯₇ / G♭₇	2959.96	5919.91	8879.87	11839.82
103	G₇	G₇	3135.96	6271.93	9407.89	12543.85
104	G♯₇ / A♭₇	G♯₇ / A♭₇	3322.44	6644.88	9967.31	13289.75
105	A₇	A₇	3520	7040	10560	14080
106	A♯₇ / B♭₇	B₇	3729.31	7458.62	11187.93	14917.24
107	B₇	H₇	3951.07	7902.13	11853.2	15804.27
108	C₈	C₈	4186.01	8372.02	12558.03	16744.04
109	C♯₈ / D♭₈	C♯₈ / D♭₈	4434.92	8869.84	13304.77	17739.69
110	D₈	D₈	4698.64	9397.27	14095.91	18794.55
111	D♯₈ / E♭₈	D♯₈ / E♭₈	4978.03	9956.06	14934.1	19912.13
112	E₈	E₈	5274.04	10548.08	15822.12	21096.16
113	F₈	F₈	5587.65	11175.3	16762.96	22350.61
114	F♯₈ / G♭₈	F♯₈ / G♭₈	5919.91	11839.82	17759.73	23679.64
115	G₈	G₈	6271.93	12543.85	18815.78	25087.71
116	G♯₈ / A♭₈	G♯₈ / A♭₈	6644.88	13289.75	19934.63	26579.5
117	A₈	A₈	7040	14080	21120	28160
118	A♯₈ / B♭₈	B₈	7458.62	14917.24	22375.86	29834.48
119	B₈	H₈	7902.13	15804.27	23706.4	31608.53
120	C₉	C₉	8372.02	16744.04	25116.05	33488.07
121	C♯₉ / D♭₉	C♯₉ / D♭₉	8869.84	17739.69	26609.53	35479.38
122	D₉	D₉	9397.27	18794.55	28191.82	37589.09
123	D♯₉ / E♭₉	D♯₉ / E♭₉	9956.06	19912.13	29868.19	39824.25
124	E₉	E₉	10548.08	21096.16	31644.25	42192.33
125	F₉	F₉	11175.3	22350.61	33525.91	44701.21
126	F♯₉ / G♭₉	F♯₉ / G♭₉	11839.82	23679.64	35519.46	47359.29
127	G₉	G₉	12543.85	25087.71	37631.56	50175.42

Some facts#

In a twelve-tone equal tempered system, the octave is divided into 12 equal parts (degrees).
The transition by one octave up, corresponds to multiplying the frequency by two.
The transition by one scale step corresponds to multiplying the frequency by $\sqrt[12]{2}$ (the twelve-degree root of two).
The basis for determining the frequency of individual notes is the frequency 440 Hz, which was arbitrary assigned to the A4 note.
Frequency 440 Hz was selected as a valid standard in 1939. In the past, however, other reference frequencies have been used depending on the historical period and the region. Directly before 1939, the so-called Pythagorean tuning was used with 432 Hz frequency of A4 note.
The frequency of the basic tone of any note selected in the tempering system can be calculated using the following formula:

$f = 440 Hz \times 2^{\dfrac{n}{12}}$
where:
- f - frequency of base tone,
- n - the number of steps (halftones) to be overcome to go from the A4 note to the selected one.
ⓘ Example: The base frequency of C5 note is:
$f = 440 Hz \times 2^{\dfrac{3}{12}} = ~523.25 Hz$
In the MIDI standard, the note A4 is assigned to number 69 (called pitch). Increasing the MIDI number by 1 means increasing the note by 1 semitone and vice versa. The frequency assigned to any MIDI number is therefore:

$f = 440 Hz \times 2^{\dfrac{p - 69}{12}}$
where:
- f - frequency assigned to given MIDI number,
- p - MIDI number (pitch).
If we transform above formula we will get formula to convert note frequency into a MIDI number (pitch):

$p = 69 + 12 \times \log_2{\left(\dfrac{f}{440 Hz}\right)}$
Most of the world (including US, UK and most of Europe countries) use below names of whole tones:

C D E F G A B

Halftones are named by adding sharp (to increase by halftone) of flat (to decrease by halftone). Then we can create names of all notes from 12-TET chromatic scale:
- names created using sharp sign (increasing by halftone):
  
  C C♯ D D♯ E F F♯ G G♯ A A♯ B
- names created using flat sign (decreasing by halftone):
  
  C D♭ D E♭ E F G♭ G A♭ A B♭ B
In the Poland, Germany, Scandinavian countries the last note in chromatic scale (note B in "international" naming) is marked with letter H. So, the names of whole tones in these regions are as below:

C D E F G A H

Names of halftones are created in the same way as before, i.e. by adding a flat or a sharp signs, except the penultimate note (B♭ on the international scale), which is marked with the letter B. So, the names of the chromatic scale notes in these regions are as follows:
- names created using sharp sign (increasing by halftone):
  
  C C♯ D D♯ E F F♯ G G♯ A B H
- names created using flat sign (decreasing by halftone):
  
  C D♭ D E♭ E F G♭ G A♭ A B H
We read rote C♯ as c sharp, note D♯ as d sharp etc.
We read note D♭ as d flat, note E♭ as e flat etc.
In addition, sometimes the so-called solomization names of wholetones are used, when learning to sing:

do re mi fa sol la si do

Initially, the first and last degree (i.e. note C) was singed as ut, but over time this name was displaced by do. However, in some countries (for example in France) the original name is still used.

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