Classical guitars come in a variety of sizes. There is the regular, full-size also known as 4/4 size or concert size. In addition, there are what are called fractional guitars. What size classical guitar should you buy?
- 4/4 size
- 7/8 size
- 3/4 size
- 1/2 size
- 1/4 size
Of these, the 7/8 size is for all practical purposes an almost 4/4 full-size guitar in terms of usage, pricing, build quality and adult customers. The other fractional sizes – 3/4 size, 1/2 size and 1/4 size – are children’s guitars.
The general guide is as follows:
- 1/4-Size – 4-6 years old
- 1/2-Size – 6-8 years old
- 3/4-Size – 8-11 years old
- 7/8-Size or 4/4-Size – 11-Adult
Keep in mind, though, there are children of various heights and hand lengths within any age band. A teacher’s guidance will always help in deciding on fractional guitars.
Although an occasional adult hobbyist or learner may take to the 3/4 size guitar for its easy playability, these guitars are normally something a child sooner or later outgrows. They are cheaper and less sturdier, just about adequate for a child to get through the learning years.
So far so good: the full size and 7/8 size guitars are ‘serious’ guitars, the rest are children’s guitars. In practice, what spoils the neat and promising system of fractional sizes is that various manufacturers have their own opinions on the actual dimensions!
A 3/4 size guitar from Yamaha, for instance, is different in its dimensions from a 3/4 size guitar from Cordoba. There is no industry standard laying down the dimensions. To make an informed decision, you must go past the fractions and learn about the actual physical dimensions and, more importantly, which dimensions really matter.
That’s what this guide is all about.
Good news: The full-size guitar is fairly standardized
Among all the sizes, the 4/4 size guitar is fairly well standardized. Two key dimensions that matter in the full-size guitar – or for that matter in any size guitar – are scale length and nut width.
Scale length is the effective length of a guitar string, the distance between the saddle on the bridge and the vertical nut near the tuning end. Standard, full-size classical guitars used to have a scale length of 26” (660 mm) but they have become less common. Today’s standard (unofficial but very common) is a scale length of 25.6” (650 mm).
Nut width is the vertical distance of the fingerboard measured at the nut. A nut width of around the 2” mark (52 mm) is fairly common among full-size guitars.
It’s easy to see why these two dimensions of all – scale length and nut width – matter. They have a direct bearing on playability, the ease with which your left hand can reach all the frets. A comfortable scale length makes for easy horizontal traversing of the left hand while the nut width determines the vertical traversing.
Take a look at the following table illustrating the key dimensions, along with other numbers like overall length and body depth, of some leading and popular brands of full size classical guitars.
Key dimensions of some popular full size classical guitarsTotal length Body length Scale length Nut width Body depth Cordoba C9 39”
990 mm19 1/4”
489 mm25.6”
650 mm2.04”
52 mm3.7-3.9”
94-99 mmCordoba C5 39.5”
1003 mm19 1/4”
489 mm25.6”
650 mm2”
50 mm3 3/4”
95-100 mmCordoba C1 39 1/4”
997 mm19 1/4”
489 mm25.6”
650 mm2.04”
52 mm3.7-3.9”
94-99 mmYamaha C40II – – 25.56”
650 mm2”
51 mm3.31”
84 mmYamaha CG142S – – 25.6”
650 mm2.05”
52 mm3.7-3.94”
94-100 mmYamaha GC22S – – 25.6”
650 mm2.04”
52 mm3.7-3.9”
94-100 mmAlhambra 7P – – 25.6″
650 mm2.04”
52 mm95-102 mm La Patrie Presentation – – 25.66”
650 mm2.04”
52 mm–
Notes: You will find the key dimensions especially are fairly close. So if you’re looking for full-size guitars you should generally be fine with regard to overall dimensions regardless of the price band you’re looking at. Secondly, the body depth often has a range of numbers rather than a single number because many guitar tops feature a slope from the lower bout to the upper bout causing variable depths along the way.
7/8 size guitars: You’re in luck again (mostly)
As mentioned, a 7/8 size classical guitar is considered a serious option by adults with small hands. Those with small hands find the 7/8 size easier to negotiate than a full-size guitar. Even luthiers make 7/8 size guitars – also known as the 630 mm scale guitars – without considering them as a compromise. A concert artiste (with small hands) will have no issues playing on a guitar of this size.
Its definition and dimensions according to most manufacturers are pretty much consistent. In fact, the scale length of these guitars is commonly pegged at 630 mm that they are even known as 630 mm guitars. I have a couple of articles on 630 mm guitars as well as small-scale guitars for adults that cover popular brands and reviews them for your benefit.
But then there is a notable exception in the Yamaha CS40, which the company terms a 7/8 guitar. Its scale length is 580 mm.
Barring that, however, almost every maker appears to adhere to the unofficial standard of the 630 mm scale length for their 7/8 offerings. Let’s look at a comparison of some popular 7/8 brands of classical guitar.
Key dimensions of some popular 7/8 classical guitarsTotal length Body length Scale length Nut width Body depth Cordoba Dolce 7/8 Iberia Series 38”
965 mm19 1/4”
489 mm24.8”
630 mm1.96″
50 mm3.6”-3.7”
92mm-94mmYamaha CS40 39.5”
1003 mm19 1/4”
489 mm22 13/16”
580 mm1 7/8”
48 mm3 1/8-3 1/4”
80-84 mmCordoba C9 Parlor 38”
965 mm18 7/8”
479 mm24.8”
630 mm2”
50 mm3 1/2-3 3/4”
90-95 mmCordoba C10 Parlor 38”
965 mm18 7/8”
479 mm24.8”
630 mm2”
50 mm3 1/2-3 3/4”
90-95 mmCordoba Estudio 39 1/4”
997 mm19 1/4”
489 mm24 3/4”
629 mm2”
50 mm3 3/4-4”
95-100 mmKremona S62C 37.79”
960 mm18.50”
470 mm24.40”
620 mm1.97”
50 mm3.78-3.94”
96-100 mm
Notes: As already seen, Yamaha’s scale length and nut width are an exception. Kremona’s S62C also varies but is fairly close to the ‘standard’. Many other brands not shown here such as Ortega and Stagg use the 7/8 name to refer to their 630 mm scale length models. Thanks to Cordoba, the term Parlor is now becoming popular to signify the 7/8 size guitar with a scale length of 630 mm.
3/4 size, 1/2 size and 1/4 size classical guitars: It’s time to pull out your hair
Classical guitars for kids. The fun begins! There is no standard. Get used to it. It drives a potential buyer nuts when looking for a guitar either for themselves or for a child. These fractions are a general indication in terms of relative sizes, informing you that a 1/4 size guitar is smaller than a 1/2 size guitar, for example. By how much? Oh well, it depends. On what? On which brands we are talking about. Will you kindly stop pulling your hair?
OK, the only way to make an informed purchase is to look for and nail down the two dimensions that matter – scale length and nut width. As mentioned, they have a direct bearing on how easy a child will find negotiating their left hand on the fingerboard. So don’t go by the fractions. Ask what these fractions represent in terms of these two key dimensions. And you are well on your way to winning this battle.
You can start by scrutinising these tables.
Key dimensions of some popular 3/4 classical guitarsTotal length Body length Scale length Nut width Body depth Yamaha CGS103AII 36 1/4”
920 mm17 11/16”
450 mm23.23”
590 mm1 7/8”
48 mm3 5/16-3 7/16”
84-88 mmOrtega Guitars Family Series R121-3/4 – – 22 13/16”
580 mm1.77”
45 mm3.54”
90 mmCordoba Cadete 37.4”
950 mm– 24.2”
615 mm1.88”
48 mm3.4”
84 mmCordoba Protege C1-3/4 37.5”
952 mm18”
457 mm24.2”
615 mm1.875”
48 mm3.35”
85 mmPyle 36” Classical Acoustic Guitar-3/4 Junior Size 36”
914 mm17.3”
440 mm22.8”
579 mm– –
Notes: You will find some blanks in the information because not every maker at this level of guitars thinks it necessary to share all the dimensional data. Remember to write and ask about the missing data if you’re interested in the model.
Key dimensions of some popular 1/2 classical guitars
| Total length | Body length | Scale length | Nut width | Body depth | |
| ADM 1/2 size | 34” 864 mm | 15.6” 396 mm | – | 1.6” 41 mm | – |
| Yamaha CGS102A | 34” 864 mm | – | 21 1/6” 535 mm | 1.9” 48 mm | 3.15-3.3” 80-84 mm |
| Cordoba C1M 1/2 size | 35.25” 895 mm | 16.75” 425 mm | 22.83” 579 mm | 1.875” 48 mm | 3.5” 89 mm |
| Cordoba Requinto 1/2 (Iberia Series) | 35.5” 895 mm | – | 22.8” 579 mm | 1.85” 47mm | 3.4” 86 mm |
| Cordoba Mini II MH | 34 3/8” 873 mm | 15.87” 403 mm | 22.875” 580 mm | 1.875” 48 mm | – |
Notes: The ADM 1/2 Size guitar is an interesting option in that it has a combination of 3 nylon strings and 3 steel strings instead of all nylon. Cordoba Protege C1M is a variant of the Protege C1, which is a full gloss finish guitar. The M stands for Matte finish. Otherwise the guitar dimensions are the same. Yamaha believes its popular CGS102AII’s 21″ scale length provides a “comfortable platform and easy finger stretch for the entrant learner.”
Key dimensions of some popular 1/4 classical guitarsTotal length Body length Scale length Nut width Body depth Pyle PGACLS30 1/4 30”
762 mm14.4”
366 mm19.7”
500 mm– – Cordoba C1M 1/4 size 31.75”
806.45 mm– 18.9”
480 mm1.75”
45 mm3.15”
80 mmCordoba Requinto 520 1/4 size – – 20.47”
520 mm– 3.30-3.38”
84-86 mmKremona S44C 1/4 Scale 28.54”
725 mm13.39”
340 mm17.3”
440 mm1.73”
44 mm2.82-2.95”
72-75 mmYamaha Guitalele 27 1/2”
698 mm12 9/16”
319 mm17”
433 mm1 7/8”
48 mm2 3/4”
70 mm
Notes: The Yamaha Guitalele is a 433mm scale ukulele-style nylon string guitar easy to carry along.
My recommendations for children’s fractional guitars:
3/4 size guitar: I’d go with the Ortega Guitars Family Series R121-3/4 (Amazon link). Or the Cordoba C1M 3/4 (Sweetwater link).
1/2 size guitar: I recommend the popular Yamaha CGS102A (Amazon link). Or here at Sweetwater.
1/4 size guitar: The well made Kremona S44C 1/4 Scale is a great choice (Amazon link). Or the Cordoba C1M 1/4 Size (Sweetwater link).
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Read my article here on Is the 630 mm Classical Guitar a Serious Option? for more details specifically about the 7/8 guitar with its leading models. And 6 Options of the 3/4 Size Classical Guitar for Your Child is a related article to get some practical options to consider if you’re looking for them.
Happy strumming!
Attribution of graphic used on page: Music vector created by macrovector – www.freepik.com