A parent walks into a guitar shop, faces a wall of guitars in four different sizes, and picks... the cheapest one. Understandable, but that's how a kid ends up fighting an instrument that's bigger than they are. This is the cheat-sheet version of sizing a guitar for a child; for the full story on buying vs. renting and acoustic vs. electric, read Buying a guitar for kids — Which size is the right one? → first.
The size chart
Most beginner guitars for children are sold in four fractional sizes. Based on the age/height ranges published by guitar teaching resources Groove Academy and Kids Guitar Dojo, a rough starting point looks like this:
| Guitar size | Age (approx.) | Height |
|---|---|---|
| 1/4 size | 4–6 years | up to about 115–120 cm |
| 1/2 size | 5–8 years | about 110–140 cm |
| 3/4 size | 8–11 years | about 127–152 cm |
| Full size (4/4) | 11/12 years and up | above about 150 cm |
These ranges overlap on purpose — both sources agree that height, arm length and comfort matter more than the birthday on the calendar, so treat the numbers as a starting point, not a rulebook.
The 10-second arm test
Skip the tape measure and try this instead: sit your kid with the guitar in playing position and have them reach for the first fret on the high E string. There should be a slight bend in the elbow. Arm stretched out straight with no bend at all? Size down. Elbow jammed against the body before the hand even reaches the neck? Size up.
Common mix-ups to avoid
- "Bigger is better value." A too-big guitar gets left in the corner because it's uncomfortable, which is a worse return on investment than renting or buying a properly sized one.
- Ignoring the middle sizes. A 1/2 or 3/4 is often the sweet spot — a kid can grow into it for a year or two instead of needing a new guitar every six months.
- Assuming electric = harder. An electric guitar's thinner neck and lighter strings can actually be easier on small hands than a steel-string acoustic — the trade-off is needing an amp and a cable a curious kid can unplug.
Want the reasoning behind acoustic vs. electric for beginners, plus buy-vs-rent options? Go read the full guide on buying a guitar for kids →. Once the guitar fits, the next question is usually "is my kid too old/young to start?" — spoiler: no, read Am I too old to learn to play the guitar? → — and the very first skill to learn on day one is how to tune the thing →.
If this saved you a confusing trip to the guitar shop, you can throw a coffee my way on Patreon — no pressure, purely for the riffs. Now go find a guitar that actually fits.