

SubContra
Octave 
Contra
Octave 
Great
Octave 





A_{2}
 B_{2} 
C_{1}
 B_{1} 
_{ }C
 B_{ } 

AAA BBB 
CC  BB 
C  B 

A_{0}
 B_{0} 
C_{1}
 B_{1} 
C_{2}
 B_{2} 

A1  B1

C0  B0

C1  B1


A1  B1

C2  B2

C3  B3




Small Octave 
OneLine
Octave 
TwoLine
Octave 





c
 b^{ } 
c^{1}
 b^{1} 
c^{2}
 b^{2} 

c
 b^{ } 
c^{'}
 b^{'} 
c^{''}
 b^{''} 

C_{3}
 B_{3} 
C_{4}
 B_{4} 
C_{5}
 B_{5} 

C2  B2

C3  B3

C4  B4


C4  B4

C5  B5

C6  B6




ThreeLine
Octave 
FourLine
Octave 
FiveLine
Octave 





c^{3}
 b^{3} 
c^{4}
 b^{4} 
c^{5} 

c^{'''}
 b^{'''} 
c^{''''}
 b^{''''} 
C^{'''''} 

C_{6}
 B_{6} 
C_{7}
 B_{7} 
C_{8} 

C5  B5

C6  B6

C7  B7


C7  B7

C8  B8

C9  B9




Helmholtz System  
Alternate Helmholtz System  
Acoustical Society of America System  
MIDI Octave Designations  
Alternate MIDI Octave Designations 
Octave Designation Systems 

Octave designations are necessary to correctly identfy every possible note from the lowest to highest pitches. Unfortunately, there is no one standard system in place today that musicians use to designate octaves. As this table shows, there are several systems and often, several verisions within each system. It is for this reason that the professional musician needs to understand all of these systems. The common reference point that can be used to make sense of all of these systems is the designation for Middle C. Once you know where Middle C is in the system, everything else can be easily determined.


Early Octave Designation System  
The first system was created by Guido d'Arezzo in the 11th century called Gamut (from the lowest note in the scale "gamma ut"). This system was used through the 18th century.  
Modern Octave Designation Systems  






