Some 12 hole harmonica brands are available in a range of keys:
In Western music theory there are only 12 chromatic notes in an octave,
so there are four enharmonics which are not shown in these tables:
Key of C and C Tenor
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | C# | F | G# | C# | C# | F | G# | C# | C# | F | G# | C# |
| Blow, Slide Out | C | E | G | C | C | E | G | C | C | E | G | C |
| Draw, Slide Out | D | F | A | B | D | F | A | B | D | F | A | B |
| Draw, Slide In | D# | F# | A# | C | D# | F# | A# | C | D# | F# | A# | D |
Key of D
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | D# | G | A# | D# | D# | G | A# | D# | D# | G | A# | D# |
| Blow, Slide Out | D | F# | A | D | D | F# | A | D | D | F# | A | D |
| Draw, Slide Out | E | G | B | C# | E | G | B | C# | E | G | B | C# |
| Draw, Slide In | F | G# | C | D | F | G# | C | D | F | G# | C | E |
Key of Eb
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | E | Ab | B | E | E | Ab | B | E | E | Ab | B | E |
| Blow, Slide Out | Eb | G | Bb | Eb | Eb | G | Bb | Eb | Eb | G | Bb | Eb |
| Draw, Slide Out | F | Ab | C | D | F | Ab | C | D | F | Ab | C | D |
| Draw, Slide In | Gb | A | Db | Eb | Gb | A | Db | Eb | Gb | A | Db | F |
Key of E
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | F | A | C | F | F | A | C | F | F | A | C | F |
| Blow, Slide Out | E | G# | B | E | E | G# | B | E | E | G# | B | E |
| Draw, Slide Out | F# | A | C# | D# | F# | A | C# | D# | F# | A | C# | D# |
| Draw, Slide In | G | A# | D | E | G | A# | D | E | G | A# | D | F# |
Key of F
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | Gb | Bb | Db | Gb | Gb | Bb | Db | Gb | Gb | Bb | Db | Gb |
| Blow, Slide Out | F | A | C | F | F | A | C | F | F | A | C | F |
| Draw, Slide Out | G | Bb | D | E | G | Bb | D | E | G | Bb | D | E |
| Draw, Slide In | Ab | B | Eb | F | Ab | B | Eb | F | Ab | B | Eb | G |
Key of G
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | G# | C | D# | G# | G# | C | D# | G# | G# | C | D# | G# |
| Blow, Slide Out | G | B | D | G | G | B | D | G | G | B | D | G |
| Draw, Slide Out | A | C | E | F# | A | C | E | F# | A | C | E | F# |
| Draw, Slide In | A# | C# | F | G | A# | C# | F | G | A# | C# | F | A |
Key of A
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | A# | D | F | A# | A# | D | F | A# | A# | D | F | A# |
| Blow, Slide Out | A | C# | E | A | A | C# | E | A | A | C# | E | A |
| Draw, Slide Out | B | D | F# | G# | B | D | F# | G# | B | D | F# | G# |
| Draw, Slide In | C | D# | G | A | C | D# | G | A | C | D# | G | B |
Key of Bb
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | B | Eb | Gb | B | B | Eb | Gb | B | B | Eb | Gb | B |
| Blow, Slide Out | Bb | D | F | Bb | Bb | D | F | Bb | Bb | D | F | Bb |
| Draw, Slide Out | C | Eb | G | A | C | Eb | G | A | C | Eb | G | A |
| Draw, Slide In | Db | E | Ab | Bb | Db | E | Ab | Bb | Db | E | Ab | C |
Key of B
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | C | E | G | C | C | E | G | C | C | E | G | C |
| Blow, Slide Out | B | D# | F# | B | B | D# | F# | B | B | D# | F# | B |
| Draw, Slide Out | C# | E | G# | A# | C# | E | G# | A# | C# | E | G# | A# |
| Draw, Slide In | D | F | A | B | D | F | A | B | D | F | A | C# |
A 16 hole Chromatic Harmonica in key of C major has the following note layout
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Alternative | °1 | °2 | °3 | °4 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | C# | F | G# | C# | C# | F | G# | C# | C# | F | G# | C# | C# | F | G# | C# |
| Blow, Slide Out | C | E | G | C | C | E | G | C | C | E | G | C | C | E | G | C |
| Draw, Slide Out | D | F | A | B | D | F | A | B | D | F | A | B | D | F | A | B |
| Draw, Slide In | D# | F# | A# | C | D# | F# | A# | C | D# | F# | A# | C | D# | F# | A# | D |
Hole one blow is C below middle C, so the next set of C's are middle C. On some 16 hole harps the first octave holes are numbered 1 to 4 with dots above them, then the remaining holes are numbered 1 to 12. Other 16 hole chroms are numbered from 1 to 16. It depends on the make, model and production date.
A 14 hole Chromatic Harmonica in key of C major has the following note layout
| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Alternative | ° | °° | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Blow, Slide In | G# | C# | C# | F | G# | C# | C# | F | G# | C# | C# | F | G# | C# |
| Blow, Slide Out | G | C | C | E | G | C | C | E | G | C | C | E | G | C |
| Draw, Slide Out | A | B | D | F | A | B | D | F | A | B | D | F | A | B |
| Draw, Slide In | A# | C | D# | F# | A# | C | D# | F# | A# | C | D# | F# | A# | D |
Hole one blow is G below middle C, so the first set of C's are middle C. On some 14 hole harps the first two holes are not numbered at all, then the remaining holes are numbered 1 to 12. Other 14 hole chroms are numbered from 1 to 14. It depends on the make & model.
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