Violin

Have your child extend their left arm out in front of them with their palm up and their fingers flat. Measure from the base of the neck to the center of the palm in inches.

Minimum Arm Length	Instrument Size
14 1/2″	1/16
16″	1/10
17 1/2″	1/8
19″	1/4
20 3/4″	1/2
22″	3/4
23 1/2″	4/4

Viola

Have your child extend their left arm out in front of them with their palm up and their fingers flat. Measure from the base of the neck to the center of the palm in inches.

Minimum Arm Length	Instrument Size
19″	11″
20 3/4″	12″
22″	13″
23 1/2″	14″
2 5″	15″
25 7 /8″	15-1/2″
26 3/8″	16″
27 1/8″	16-1/2″

Cello

Have your child extend their left arm out in front of them with their palm up and their fingers flat. Measure from the base of the neck to the center of the palm in inches.

Arm Length	Height	Instrument Size
16″	3′	1/10
16″ – 18″	3′ – 3’6″	1/8
18″ – 20″	4′	1/4
20″ – 22″	4′ – 4’6″	1/2
22″ – 24″	4’6″ – 5′	3/4
24″ and up	5′ and up	4/4

Finger Span

To measure finger span, have your child extend their fingers on their left hand. Measure from their index finger to their pinky finger in inches.

Finger Span	Instrument Size
2.5″ – 3″	1/10
3″	1/8
3″ – 4″	1/4
4″ – 5″	1/2
5″ – 6″	3/4
6″ and up	4/4