How to size a violin for a child?

Violin comes in 8 different sizes: 4/4 (also called Full size), 3/4, 1/2,
1/4, 1/8, 1/10, 1/16. 4/4 size being the biggest and 1/16 size being the
smallest. All adults, regardless of their size, use the 4/4 violin. There is
another uncommon size, 7/8, usually used by female professional violinist who
wants a full-size violin sound but whose hand might be a little small for the
full size violin. So violin makers would make violins just a little smaller than
full size to accommodate these players.

How to measure arm length?

To measure what size violin best suits you, you need to know the length between your neck and the middle of your left-hand palm (when your hand is fully  extended and raised perpendicular to your body, just like holding a violin).  Some teachers prefer students to use the length from the neck to the wrist for  measurement instead of the neck to mid-palm approach. The violin size determined by the neck/wrist approach would be the size that is more comfortable for students to hold. The violin size determined by the neck/mid-palm approach would be the biggest size students should use.

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