The correct size is most accurately determined by the player’s height and age. It's also important to choose a guitar that will inspire you or your child to play. If they're into rock music, best to go for an electric guitar. Folk music is best played on a steel string acoustic.
A couple of things to consider when deciding on a first guitar:
1. Different guitar types are not uniform in size.
Electric Guitars are much smaller than Steel-String Acoustic Guitars and Nylon String Classical Guitars, they can basically be used by most people, but you do need to consider the extra weight. Acoustic Guitars are bigger but hollow, whereas Electric guitars are smaller but made of solid wood so can be a little heavier.
2. A Nylon or Classical guitar is much easier to play, particularly for a young player.
The steel strings of an acoustic guitar or electric guitar may cause some pain or discomfort when you start to play. Imagine pushing down on a butter knife. We find that children, in particular, are more inclined to persist if they play a nylon string guitar to begin with. The strings are much wider and easier on the fingers.
What Size Electric Guitar Should You Buy?
Age
Height
Guitar Size
5 - 10 years
80 - 125cm
3/4 Size
10+ years
125cm +
Full Size
Smaller in size than acoustic or classical
Good for rock, metal, pop and country music
Has steel strings which can be hard on young fingers
Can be heavy, depending on the model.
What Size Acoustic Guitar Should You Buy?
Age
Height
Guitar Size
5 - 12 years
100 - 120cm
3/4 Size
12 - 15 years
120 - 165cm
Small Body
15+ years
165cm +
Full Size
Good for folk, pop, country, slow rock music
Has steel strings which can be hard on young fingers
Sounds bright and loud, great for strumming chords
Lightweight but bulky
What Size Classical Guitar (Nylon String) Guitar Should You Buy?
Age
Height
Guitar Size
2 - 5 years
75 - 100cm
1/4 Size
5 - 8 years
100 - 125cm
1/2 Size
8 - 12 years
125 - 165cm
3/4 Size
12+ years
165cm +
Full Size*
* A full-size classical guitar has a wider neck than other guitars. If your child has small hands we recommend the CL44S slim neck classical guitar.