MIDI Notes

Middle C is MIDI Note Number 60.

This can be C3 or C4, or even C2 or C5. There is no defined standard or convention. The MIDI standard only says that the note number 60 is a C, it does not say of which octave.

Ref.: Complete MIDI 1.0 Detailed Specification :

Each note is assigned a numeric value, which is transmitted with any Note-On/Off message. Middle C has a reference value of 60. This is the middle C of an 88 note piano-style keyboard though it need not be physically located in the center of a keyboard.

Other refs :

Octaves range depending on the definition of middle C:

With middle C defined as C3 :

MIDI note number Note names (English)
127 G8
120 C8
60 C3 (middle C)
24 C0
0 C-2

With middle C defined as C4 :

MIDI note number Note names (English)
127 G9
120 C9
60 C4 (middle C)
12 C0
0 C-1

All note numbers alongside key numbers of 61 and 88 notes piano keyboards:

With middle C defined as C4

Source

MIDI note number Note name
(english)		 Frequency
equal tuning at 440 Hz		 Key number
61 keys organ		 Key number
88 keys piano
127 G9 12543.85
126 F#9/Gb9 11839.82
125 F9 11175.30
124 E9 10548.08
123 D#9/Eb9 9956.06
122 D9 9397.27
121 C#9/Db9 8869.84
120 C9 8372.02
119 B8 7902.13
118 A#8/Bb8 7458.62
117 A8 7040.00
116 G#8/Ab8 6644.88
115 G8 6271.93
114 F#8/Gb8 5919.91
113 F8 5587.65
112 E8 5274.04
111 D#8/Eb8 4978.03
110 D8 4698.64
109 C#8/Db8 4434.92
MIDI note number Note name
(english)		 Frequency
equal tuning at 440 Hz		 Key number
61 keys organ		 Key number
88 keys piano
108 C8 4186.01 88
107 B7 3951.07 87
106 A#7/Bb7 3729.31 86
105 A7 3520.00 85
104 G#7/Ab7 3322.44 84
103 G7 3135.96 83
102 F#7/Gb7 2959.96 82
101 F7 2793.83 81
100 E7 2637.02 80
99 D#7/Eb7 2489.02 79
98 D7 2349.32 78
97 C#7/Db7 2217.46 77
96 C7 2093.00 61 76
95 B6 1975.53 60 75
94 A#6/Bb6 1864.66 59 74
93 A6 1760.00 58 73
92 G#6/Ab6 1661.22 57 72
91 G6 1567.98 56 71
90 F#6/Gb6 1479.98 55 70
89 F6 1396.91 54 69
88 E6 1318.51 53 68
87 D#6/Eb6 1244.51 52 67
86 D6 1174.66 51 66
85 C#6/Db6 1108.73 50 65
84 C6 1046.50 49 64
83 B5 987.77 48 63
82 A#5/Bb5 932.33 47 62
81 A5 880.00 46 61
80 G#5/Ab5 830.61 45 60
79 G5 783.99 44 59
78 F#5/Gb5 739.99 43 58
77 F5 698.46 42 57
76 E5 659.26 41 56
75 D#5/Eb5 622.25 40 55
74 D5 587.33 39 54
73 C#5/Db5 554.37 38 53
72 C5 523.25 37 52
MIDI note number Note name
(english)		 Frequency
equal tuning at 440 Hz		 Key number
61 keys organ		 Key number
88 keys piano
71 B4 493.88 36 51
70 A#4/Bb4 466.16 35 50
69 A4 concert pitch 440.00 34 49
68 G#4/Ab4 415.30 33 48
67 G4 392.00 32 47
66 F#4/Gb4 369.99 31 46
65 F4 349.23 30 45
64 E4 329.63 29 44
63 D#4/Eb4 311.13 28 43
62 D4 293.66 27 42
61 C#4/Db4 277.18 26 41
60 C4 (middle C) 261.63 25 40
59 B3 246.94 24 39
58 A#3/Bb3 233.08 23 38
57 A3 220.00 22 37
56 G#3/Ab3 207.65 21 36
55 G3 196.00 20 35
54 F#3/Gb3 185.00 19 34
53 F3 174.61 18 33
52 E3 164.81 17 32
51 D#3/Eb3 155.56 16 31
50 D3 146.83 15 30
49 C#3/Db3 138.59 14 29
48 C3 130.81 13 28
47 B2 123.47 12 27
46 A#2/Bb2 116.54 11 26
45 A2 110.00 10 25
44 G#2/Ab2 103.83 9 24
43 G2 98.00 8 23
42 F#2/Gb2 92.50 7 22
41 F2 87.31 6 21
40 E2 82.41 5 20
39 D#2/Eb2 77.78 4 19
38 D2 73.42 3 18
37 C#2/Db2 69.30 2 17
36 C2 65.41 1 16
MIDI note number Note name
(english)		 Frequency
equal tuning at 440 Hz		 Key number
61 keys organ		 Key number
88 keys piano
35 B1 61.74 15
34 A#1/Bb1 58.27 14
33 A1 55.00 13
32 G#1/Ab1 51.91 12
31 G1 49.00 11
30 F#1/Gb1 46.25 10
29 F1 43.65 9
28 E1 41.20 8
27 D#1/Eb1 38.89 7
26 D1 36.71 6
25 C#1/Db1 34.65 5
24 C1 32.70 4
23 B0 30.87 3
22 A#0/Bb0 29.14 2
21 A0 27.50 1
20 G# 25.96
19 G 24.50
18 F# 23.12
17 F 21.83
16 E 20.60
15 D# 19.45
14 D 18.35
13 C# 17.32
12 C0 16.35
11 B 15.43
10 A# 14.57
9 A 13.75
8 G# 12.98
7 G 12.25
6 F# 11.56
5 F 10.91
4 E 10.30
3 D# 9.72
2 D 9.18
1 C# 8.66
0 C-1 8.18
MIDI note number Note name
(english)		 Frequency
equal tuning at 440 Hz		 Key number
61 keys organ		 Key number
88 keys piano