All manufacturers are not exactly the same, but here are some general dimensions of different body styles to give you an idea of comparative sizes...

Body Size Length Depth Upper Bout Width Lower Bout Width
Concert 18  3/8" 4  1/4" 10" 13  1/2"
Grand Concert 18  7/8" 4  1/8" 10  7/8" 14  5/16"
Classical 19  1/8" over  4  1/8" 11" 14  1/2"
Auditorium 19  3/8" 4  1/8" 11  1/4" 15"
Grand Auditorium 20  1/8" 4  1/8" 11  11/16" 16"
Jumbo over 20  1/8" 4  7/8" over 11 11/16" over 16"
Dreadnought 20" 4  7/8" 11  1/2" 15  5/8"

 

 

 

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