Low C bass clarinet · written pitch · treble clef · black = pressed or covered
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Low extension (below low E)C3–E♭3
C3concert B♭1Thumb hole, left hand 1-2-3, right hand 1-2-3 and low C keyBeing checked
C♯3 / D♭3concert B1Thumb hole, left hand 1-2-3, right hand 1-2-3 and low C♯ keyBeing checked
D3concert C2Thumb hole, left hand 1-2-3, right hand 1-2-3 and low D keyBeing checked
E♭3 / D♯3concert D♭2Thumb hole, left hand 1-2-3, right hand 1-2-3 and low E♭ keyBeing checked
Low (chalumeau) registerE3–F♯4
E3concert D2Thumb hole, left hand 1-2-3, right hand 1-2-3 and left pinky E/B keyAlt: Thumb hole, left hand 1-2-3, right hand 1-2-3 and right pinky E/B key
F3concert E♭2Thumb hole, left hand 1-2-3, right hand 1-2-3 and right pinky F/C keyAlt: Thumb hole, left hand 1-2-3, right hand 1-2-3 and left pinky F/C key
F♯3 / G♭3concert E2Thumb hole, left hand 1-2-3, right hand 1-2-3 and left pinky F♯/C♯ keyAlt: Thumb hole, left hand 1-2-3, right hand 1-2-3 and right pinky F♯/C♯ key
G3concert F2Thumb hole, left hand 1-2-3 and right hand 1-2-3
G♯3 / A♭3concert F♯2Thumb hole, left hand 1-2-3, right hand 1-2-3 and right pinky A♭/E♭ key
A3concert G2Thumb hole, left hand 1-2-3 and right hand 1-2
B♭3 / A♯3concert A♭2Thumb hole, left hand 1-2-3 and right hand 1Being checked
B3concert A2Thumb hole, left hand 1-2-3 and B/F♯ sliver keyBeing checked
C4concert B♭2Thumb hole and left hand 1-2-3
C♯4 / D♭4concert B2Thumb hole, left hand 1-2-3 and left pinky C♯/G♯ key
D4concert C3Thumb hole and left hand 1-2
E♭4 / D♯4concert D♭3Thumb hole, left hand 1 and E♭/B♭ sliver keyBeing checked
E4concert D3Thumb hole and left hand 1
F4concert E♭3Thumb hole
F♯4 / G♭4concert E3Left hand 1
Throat tonesG4–B♭4
G4concert F3Open: no keys or holes
G♯4 / A♭4concert F♯3G♯ key
A4concert G3A key
B♭4 / A♯4concert A♭3Register key and A key
Upper (clarion) registerB4–C6
B4concert A3Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and left pinky E/B keyAlt: Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and right pinky E/B key
C5concert B♭3Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and right pinky F/C keyAlt: Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and left pinky F/C key
C♯5 / D♭5concert B3Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and left pinky F♯/C♯ keyAlt: Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and right pinky F♯/C♯ key
D5concert C4Thumb hole, register key, left hand 1-2-3 and right hand 1-2-3
E♭5 / D♯5concert D♭4Thumb hole, register key, left hand 1-2-3, right hand 1-2-3 and right pinky A♭/E♭ key
E5concert D4Thumb hole, register key, left hand 1-2-3 and right hand 1-2
F5concert E♭4Thumb hole, register key, left hand 1-2-3 and right hand 1Being checked
F♯5 / G♭5concert E4Thumb hole, register key, left hand 1-2-3 and B/F♯ sliver keyBeing checked
G5concert F4Thumb hole, register key and left hand 1-2-3
G♯5 / A♭5concert F♯4Thumb hole, register key, left hand 1-2-3 and left pinky C♯/G♯ key
A5concert G4Thumb hole, register key and left hand 1-2
B♭5 / A♯5concert A♭4Thumb hole, register key, left hand 1 and E♭/B♭ sliver keyBeing checked
B5concert A4Thumb hole, register key and left hand 1