Guitar Size Guide: The Right Size for Kids and Adults
A guitar that is too big makes every chord a stretch. Use this chart to find the right size for a child or adult, then check the fit with a quick test.
Guitar size chart
Use age as a starting point, but height and arm length matter more. When a child is between sizes, the smaller one is usually more comfortable.
| Guitar size | Approx. age | Player height | Total length |
|---|---|---|---|
| 1/4 | 4–6 years | under 120 cm (3'11") | about 76–80 cm |
| 1/2 | 6–8 years | 120–135 cm (3'11"–4'5") | about 86 cm |
| 3/4 | 8–12 years | 135–150 cm (4'5"–4'11") | about 91–94 cm |
| 7/8 | 12+ / small adults | 150–160 cm (4'11"–5'3") | about 97 cm |
| Full size (4/4) | Teens and adults | 160 cm+ (5'3"+) | about 99–104 cm |
Classical (nylon-string) guitars in 1/2 and 3/4 sizes are ideal for young children: the strings are soft on small fingers. From about age 10, a 3/4 steel-string acoustic or a short-scale electric also works well.
How to check the fit
- Sit down with the guitar resting on the right thigh (left thigh for classical position).
- Reach the left hand to the first fret. The arm should be comfortably bent at the elbow — not fully straight.
- The player should be able to see over the top of the body without hunching.
- The fretting hand should reach the first and fourth frets without strain when fingers are spread.
- Standing with a strap, the body should not hang below the hips for a child.
Size options for adults
Many adults with smaller hands or shorter arms do not need a child-size guitar — instead look for:
- Concert or parlor body shapes, which are narrower than a dreadnought and easier to wrap your arm around.
- Short-scale guitars (around 24"–24.75" scale length) where frets are slightly closer together.
- Slim neck profiles on electric guitars.
- Travel guitars — handy but usually quieter and less full-sounding.
Should a child start on acoustic or electric?
For children under 8, a small classical guitar is the usual recommendation. Older children who love rock music often practise more on a short-scale electric with headphones. Motivation matters more than the "correct" instrument. See acoustic vs classical vs electric for a full comparison.
Frequently asked questions
What size guitar does a 10-year-old need?
Usually a 3/4 size. If the child is tall for their age (over about 150 cm), try a 7/8 or full size.
Can an adult play a 3/4 guitar?
Yes. Many adults use 3/4 guitars for travel. The sound is smaller, and larger hands may feel cramped higher up the neck.
What is scale length?
Scale length is the vibrating length of the string, from the nut to the saddle. Shorter scales mean slightly closer frets and slightly lower string tension.
