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MIDI 1.0 supports 128 note numbers representing pitches in a 12-tone, equal temperament system.

Since it's hard to remember the association between a note number and its name its common to accept a human-readable name of the form: note(accidental)octave: eg. C3, F#5.

There are multiple conventions for converting between note names and pitches. Here we enumerate the C4 octave convention wherein C4 is Middle-C (which is always MIDI note 60). Note that the C4 convention is the one employed by Scientific Pitch Notation. Keep in mind that your favorite DAW may employ a different convention from C4. Also note that some musical instruments notate music according to a standard for transposing notes to better fit on a musical staff.

Octave C C#/Db D D#/Eb E F F#/Gb G G#/Ab A A#/Bb B
-1 0 1 2 3 4 5 6 7 8 9 10 11
0 12 13 14 15 16 17 18 19 20 21 22 23
1 24 25 26 27 28 29 30 31 32 33 34 35
2 36 37 38 39 40 41 42 43 44 45 46 47
3 48 49 50 51 52 53 54 55 56 57 58 59
4 60 61 62 63 64 65 66 67 68 69 70 71
5 72 73 74 75 76 77 78 79 80 81 82 83
6 84 85 86 87 88 89 90 91 92 93 94 95
7 96 97 98 99 100 101 102 103 104 105 106 107
8 108 109 110 111 112 113 114 115 116 117 118 119
9 120 121 122 123 124 125 126 127 n/a n/a n/a n/a
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