Guitar Sizing Guide: Choosing the Right Size Guitar for Your Child

Why Guitar Size Matters

Handing a child a full-size guitar is a bit like asking them to play tennis with an adult racquet — they might manage, but it'll be uncomfortable, they'll develop bad habits, and they're far more likely to give up. A guitar that's too big forces children to overextend their arms, strain their wrists, and struggle to fret notes cleanly. A guitar that's too small will feel cramped and won't produce the sound they need to progress.

The good news is that children's guitars come in several well-defined sizes, and finding the right one is straightforward once you know what to look for. No musical knowledge required — just a tape measure.

Guitar Size Chart

Guitars are sized in fractions, just like violins and cellos. Here's the standard sizing chart with age and height correspondences:

Important: These are guidelines, not rules. Children of the same age vary enormously in size. A tall eight-year-old might be ready for a 3/4, while a smaller ten-year-old might still be more comfortable on a 1/2. Always measure rather than guessing from age alone.

How to Measure Your Child for a Guitar

The most reliable way to size a guitar is to consider your child's height and arm length together. Here's a simple method:

The Height Method

Measure your child's height in centimetres (shoes off, standing straight) and use the chart above. This gives you a good starting point for most children.

The Sitting Test

If you have access to a guitar (at a music shop, a friend's house, or the school), the sitting test is even more reliable:

1. Have your child sit upright in a chair with their feet flat on the floor.
2. Place the guitar on their right thigh (for a right-handed player) with the body resting naturally against them.
3. Check that they can reach around the body of the guitar comfortably with their right arm without hunching their shoulder.
4. With their left hand on the fretboard near the nut (the top end), check that their arm has a comfortable bend at the elbow — not fully extended, not sharply bent.
5. Can they press down on the strings at the first fret without straining? If their fingers can't reach around the neck comfortably, the guitar is too big.

Tip: If your child is between sizes, go with the smaller one. A slightly smaller guitar that's comfortable to play will always serve them better than one they're struggling to hold. They'll size up naturally as they grow.

Classical vs Acoustic: Which Is Better for Beginners?

This is one of the most common questions parents ask, and it's a good one. There are meaningful differences between classical and acoustic guitars that affect how easy they are for a child to play.

Classical Guitar (Nylon Strings)

• Softer strings — Nylon strings are significantly easier on small fingers. New players will experience less finger soreness and can practise for longer before their fingertips toughen up.
• Wider neck — The fretboard is broader, which gives small fingers more room to place notes without accidentally muting neighbouring strings.
• Lighter and smaller body — Generally more manageable for younger children.
• Used in most school programmes — If your child is learning guitar at school in New Zealand, chances are they'll be using a classical guitar.

Acoustic Guitar (Steel Strings)

• Brighter, louder sound — Steel strings produce the sound most people associate with "guitar" from pop and rock music.
• Narrower neck — Can be easier for some chord shapes but leaves less room for error with finger placement.
• Harder on fingers — Steel strings require more pressure and will cause more initial soreness. Calluses develop within a few weeks of regular practice.
• Better suited to older beginners — A twelve-year-old who wants to play Ed Sheeran songs will be happier on a steel-string acoustic than a classical guitar.

Our Recommendation

For children under ten, a classical guitar is almost always the better starting point. The nylon strings are kinder on developing fingers, the wider neck accommodates smaller hands, and the technique learned on a classical guitar transfers perfectly to acoustic or electric guitar later on.

For older beginners — especially teenagers who are motivated by wanting to play specific songs — an acoustic guitar can work well from the start, provided the guitar is properly sized and set up with a low action (the distance between the strings and the fretboard). A high action makes any guitar significantly harder to play.

What About Electric Guitar?

Electric guitars are available in smaller sizes too, and they have one major advantage for beginners: the strings are lighter gauge and easier to press down than acoustic steel strings. However, an electric guitar also requires an amplifier, a lead, and potentially headphones — which adds to the cost and complexity.

Most guitar teachers recommend starting on an acoustic or classical guitar to build fundamental technique before moving to electric. That said, if your child's burning ambition is to play electric guitar and that's what's going to keep them motivated, there's no harm in starting there. Enthusiasm trumps convention every time.

Common Sizing Mistakes

Buying a full-size guitar "to grow into"

This is the most common mistake, and it's the same trap parents fall into with violins. A full-size guitar in the hands of a seven-year-old is uncomfortable at best and harmful at worst. They'll struggle to reach the frets, their wrist will be at an awkward angle, and they'll develop poor technique that's hard to unlearn later. Get the right size now and swap when they grow.

Ignoring the action

The "action" is the height of the strings above the fretboard. On a cheap or poorly set-up guitar, the action can be very high, which makes the strings harder to press down. This is one of the top reasons children give up guitar — they think they can't do it, when actually the instrument is fighting them. A properly set-up guitar with appropriate action makes an enormous difference. Every instrument from Prelude is professionally set up before it reaches you.

Choosing by looks alone

Children are drawn to cool-looking guitars, which is perfectly natural. But a guitar that looks great but is the wrong size or type will be frustrating to play. Let them have a say in colour and style, but make sure the size and playability come first.

When to Size Up

Children typically stay on each guitar size for two to three years, though growth spurts can change that. Signs it's time to move up:

• Their fretting arm looks cramped, with the elbow sharply bent when playing at the lower frets.
• They're reaching the end of the fretboard easily and the guitar feels small against their body.
• Their teacher suggests it — teachers can spot sizing issues before they become problems.

This is where renting really shines. Rather than selling a 1/2 size guitar and buying a 3/4, you simply swap. No hassle, no financial loss, no gap between instruments. Browse our guitar range to see what's available across all sizes and tiers.

Ready to Find the Right Guitar?

Measure your child's height, check the size chart, and if possible have them sit with a guitar to confirm the fit. If you're still unsure, their guitar teacher will be able to advise — or you can get in touch with us and we'll help you find the right match.

A properly sized guitar is comfortable, inviting, and fun to play. That's exactly what your child needs to build the confidence and enthusiasm that will keep them practising.