MIDI notes numbers and Middle C

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MIDI note numbers and Middle C definition.

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 numberNote names (English)
127G8
120C8
60C3 (middle C)
24C0
0C-2

With middle C defined as C4 :

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

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

With middle C defined as C4

Source

MIDI note numberNote name
(english)
Frequency
equal tuning at 440 Hz
Key number
61 keys organ
Key number
88 keys piano
127G912543.85
126F#9/Gb911839.82
125F911175.30
124E910548.08
123D#9/Eb99956.06
122D99397.27
121C#9/Db98869.84
120C98372.02
119B87902.13
118A#8/Bb87458.62
117A87040.00
116G#8/Ab86644.88
115G86271.93
114F#8/Gb85919.91
113F85587.65
112E85274.04
111D#8/Eb84978.03
110D84698.64
109C#8/Db84434.92
MIDI note numberNote name
(english)
Frequency
equal tuning at 440 Hz
Key number
61 keys organ
Key number
88 keys piano
108C84186.0188
107B73951.0787
106A#7/Bb73729.3186
105A73520.0085
104G#7/Ab73322.4484
103G73135.9683
102F#7/Gb72959.9682
101F72793.8381
100E72637.0280
99D#7/Eb72489.0279
98D72349.3278
97C#7/Db72217.4677
96C72093.006176
95B61975.536075
94A#6/Bb61864.665974
93A61760.005873
92G#6/Ab61661.225772
91G61567.985671
90F#6/Gb61479.985570
89F61396.915469
88E61318.515368
87D#6/Eb61244.515267
86D61174.665166
85C#6/Db61108.735065
84C61046.504964
83B5987.774863
82A#5/Bb5932.334762
81A5880.004661
80G#5/Ab5830.614560
79G5783.994459
78F#5/Gb5739.994358
77F5698.464257
76E5659.264156
75D#5/Eb5622.254055
74D5587.333954
73C#5/Db5554.373853
72C5523.253752
MIDI note numberNote name
(english)
Frequency
equal tuning at 440 Hz
Key number
61 keys organ
Key number
88 keys piano
71B4493.883651
70A#4/Bb4466.163550
69A4 concert pitch440.003449
68G#4/Ab4415.303348
67G4392.003247
66F#4/Gb4369.993146
65F4349.233045
64E4329.632944
63D#4/Eb4311.132843
62D4293.662742
61C#4/Db4277.182641
60C4 (middle C)261.632540
59B3246.942439
58A#3/Bb3233.082338
57A3220.002237
56G#3/Ab3207.652136
55G3196.002035
54F#3/Gb3185.001934
53F3174.611833
52E3164.811732
51D#3/Eb3155.561631
50D3146.831530
49C#3/Db3138.591429
48C3130.811328
47B2123.471227
46A#2/Bb2116.541126
45A2110.001025
44G#2/Ab2103.83924
43G298.00823
42F#2/Gb292.50722
41F287.31621
40E282.41520
39D#2/Eb277.78419
38D273.42318
37C#2/Db269.30217
36C265.41116
MIDI note numberNote name
(english)
Frequency
equal tuning at 440 Hz
Key number
61 keys organ
Key number
88 keys piano
35B161.7415
34A#1/Bb158.2714
33A155.0013
32G#1/Ab151.9112
31G149.0011
30F#1/Gb146.2510
29F143.659
28E141.208
27D#1/Eb138.897
26D136.716
25C#1/Db134.655
24C132.704
23B030.873
22A#0/Bb029.142
21A027.501
20G#25.96
19G24.50
18F#23.12
17F21.83
16E20.60
15D#19.45
14D18.35
13C#17.32
12C016.35
11B15.43
10A#14.57
9A13.75
8G#12.98
7G12.25
6F#11.56
5F10.91
4E10.30
3D#9.72
2D9.18
1C#8.66
0C-18.18
MIDI note numberNote name
(english)
Frequency
equal tuning at 440 Hz
Key number
61 keys organ
Key number
88 keys piano
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