Parents · Free
Instrument size advisor
Quick guidance before you rent or buy.
Strings
- Violin — arm length; elementary often 1/4–1/2; middle school 3/4–4/4.
- Viola / cello — teacher measurement beats guessing; rentals help growth spurts.
Winds & brass
Student models are usually full-size — focus on condition, not “1/2 trumpet.”
Guitar
1/2, 3/4, 4/4 by comfort; small hands often prefer 3/4.