Acoustic Guitar Minimum Back & Sides sizes:

Length x Width x Thickness (Millimetres  |  Inches)

Dreadnought:

Backs minimum sizing:

559mm x 210mm x 3.9mm | 22" x 8-1/2" x 0.155"

Sides minimum sizing:

813mm x 127mm x 3.3mm | 32" x 5" x 0.130"

Classical/OM:

Backs minimum sizing:

533mm x 197mm x 3.9mm | 21" x 7-3/4" x 0.155"

Sides minimum sizing:

762mm x 114mm x 3.3mm | 30" x 4-1/2" x 0.130"

Parlor:

Backs minimum sizing:

495mm x 172mm x 3.9mm | 19-1/2" x 6-3/4" x 0.155"

Sides minimum sizing:

711mm x 114mm x 3.3mm | 28" x 4-1/2" x 0.130"  

Soprano Ukulele

Back minimum dimensions:

267mm x 102mm | 10-1/2" x 4"  

Sides minimum dimensions:

394mm x 89mm | 15-1/2" x 3-1/2" 

Tenor Ukulele:

Back minimum dimensions:

311mm x 114mm | 12-1/4" x 4-1/2"  

Sides minimum dimensions:

508mm x 76mm |  20" x 3"