Scale length (string instruments)

For the musical (rather than instrumental) scale, see Pythagorean tuning.

String instruments produce sound through the vibration of their strings. The range of tones these strings can produce is determined by three primary factors: the mass of the string (related to its thickness as well as other aspects of its construction: density of the metal/alloy etc.), the tension placed upon it, and the instrument's scale length. When referring to stringed instruments, the scale length (often simply called the "scale") is considered to be the maximum vibrating length of the strings to produce sound, and determines the range of tones that string is capable of producing under a given tension. In the classical community, it may be called simply "string length" or less often "mensure." On instruments in which strings are not "stopped" or divided in length (typically by frets, the player's fingers, or other mechanism), such as the piano, it is the actual length of string between the nut and the bridge.

On many, but not all, instruments, the strings are at least roughly the same length, so the instrument's scale can be expressed as a single length measurement, as for example in the case of the violin or guitar. On other instruments, the strings are of different lengths according to their pitch, as for example in the case of the harp or piano.

On most modern fretted instruments, the actual string length is a bit longer than the scale length, to provide some compensation for the "sharp" effect caused by the string being slightly stretched when it is pressed against the fingerboard. This causes the pitch of the note to go slightly sharp (higher in pitch). Another factor in modern instrument design is that, at the same tension, thicker strings are more sensitive to this effect, which is why saddles on acoustic (and often electric) guitars are set on a slight diagonal. This gives the thicker strings slightly more length.

All other things being equal, increasing the scale length of an instrument requires an increase in string tension for a given pitch.

A musical string may be divided by the twelfth root of two $\scriptstyle {\sqrt[{12}]{2}}$, approximately 1.059463094 and the result taken as the string-length position at which the next semitone pitch (fret position) should be placed from the previous fret (or, in case this is the first calculation, the nut (instrumental) or zero fret) of the instrument. This quotient is then divided again by itself to locate the next semitone higher, and so on.

Alternatively, the string may be divided by $\scriptstyle {\frac {\sqrt[{12}]{2}}{{\sqrt[{12}]{2}}-1}}$, approximately 17.817, and the quotient taken as the location of the next semitone pitch from the nut of the instrument. The remainder is again divided by 17.817 to locate the next semitone pitch higher, and so on. For centuries the divisor 18 was used instead; this "Eighteen Rule" produced a sort of rough compensation. Actual fret spacing on the fretboard was often done by trial and error method (testing) over the ages. However, since the nineteenth century the availability of precision measuring instruments has allowed frets to be laid out with mathematical accuracy.

In many instruments, for example the violin, the scale of a full-sized instrument is very strictly standardised. Smaller scale instruments are still often used:

• By younger players.
• By smaller advanced players.
• To obtain a particular tone or effect.
• For convenience when travelling.

Larger scale instruments are rare, but may be used by experimental and avant-garde players, or specially made for soloists with particularly extended reach.

In other instruments, for example the viola and the electric guitar, the scale of a full-sized instrument varies a great deal.

Bowed strings

Violin family

The two most famous violin makers, Antonio Stradivari (1644–1737) and Giuseppe Guarneri del Gesù (1698–1744), both used an open string length of 12.8 in (327 mm) for their violins, which had already been established a generation before by Jacob Stainer (c. 1617–1683). Later makers have been unwilling to deviate from this.

Smaller scale instruments are used extensively to teach younger players. The size of these is described by a "conventional" fraction that has no mathematical significance. For example, a 7/8 violin has a scale of about 317 mm, a 3/4-size instrument a scale of 307 mm, a half-size one 287 mm, and a quarter-size one 267 mm. 1/8, 1/10, 1/16 and 1/32 and even 1/64 violins also exist, becoming progressively smaller, but again in no proportional relationship. (A full-size instrument is described as 4/4.)

Cellos exist in a smaller range of sizes than violins, with 4/4, 3/4, 1/2, 1/4, 1/8, and 1/10 being reasonably common. As with the violin, the Stradivarius scale is regarded as standard for orchestral work; This is about 27.4 in (695 mm).

Violas are commonly described in terms of their body length rather than by a conventional fraction. There are two reasons for this. Firstly, unlike that of the violin and the cello, the viola scale length has not standardised, but rather an advanced player will use whatever scale length best suits them. Secondly, student sizes are not as often required, as most viola players who start learning at a young age would start on the violin. Common sizes include 17 in (43 cm), 16.5 in (42 cm), 16 in (41 cm), 15.5 in (39 cm), 15 in (38 cm), 14 in (36 cm), and less commonly 12 in (30 cm), smaller than a standard violin; These measurements are nominal and approximate. At least one of the surviving Stradivarius violas has a scale length of 14.25 in (362 mm).

Double bass

There is some variation in the scale length of an orchestral double bass, generally in the range 41.3 – 43.3 inches (105 – 110 cm). There are also smaller versions of this "full scale" double bass with the same scale length but with a smaller sound box, intended for other musical idioms. Smaller scale instruments are also quite commonly used by full-sized players in jazz, folk music and similar ensembles.

The system of conventional fractions is taken to its logical conclusion with string bass sizes, in that a full-size (4/4) bass is uncommon. Most basses are 3/4 or 7/8, and younger players can use 1/2 or even 1/4 size instruments.

Classical guitar

Like that of the violin, the scale of the classical guitar was standardized by the work of its most famous maker. Antonio De Torres (1817–1892) used a scale length of 25.6 in (650 mm), and later makers have followed suit. However, from the mid- 20th Century luthiers seeking increased volume have moved to a 26 in (660mm) scale, which is now the standard for such leading makers as Ramirez.

Unlike Stradivarius, Torres had no strong tradition on which to build regarding scale length, so the 25.6 in figure can be attributed to him with confidence.

Steel-string acoustic guitar

The steel-string acoustic guitar typically has a scale slightly shorter than the classical instrument, the most common scales ranging between 24.6 in and 25.4 in.

Electric guitar

The scale length of an electric guitar affects both its playability and its tone. Regarding playability, a shorter scale length allows more compact fingering and favors shorter fingers and hand-span. A longer scale allows more expanded finger and favors longer fingers and hand-span. With regard to tone, a longer scale (e.g. Fender Telecasters with 25.5 inch (648 mm) scale length) favors "brightness" or cleaner overtones and more separated harmonics versus a shorter scale (e.g. Gibson Les Paul with 24.75 in (629 mm) scale length) which favors "warmth" or more muddy overtones. According to Dave Hunter's "Tone Manual" (2011), each scale length has its characteristic sound and tone, which is individual from other sounds in the tone chain: strings, pickups, pedals, amplifiers, speakers, and cabinets.

History

Most Fender electric guitars, including the Stratocaster, Telecaster, Esquire, and Jazzmaster use a scale length of 25.5 in (648 mm). A few Fender models such as the Jaguar use a scale length of 24 in (610 mm). Fender has also built some 3/4-size student guitars with a scale length of 22.5 in (572 mm) or shorter.

Gibson uses a scale length of 24.75 in (629 mm) on many of its electric guitars, including the Les Paul, Flying V, Explorer, SG, and ES-335. Gibson has used other scale lengths on various models through the years.

Summary

Single Scale

• 20.7 in (527 mm):
  • Rickenbacker Electro (student model) Es-16, Rickenbacker 1996, 320 and 325, notably John Lennon's most famous guitar
  • Squier Bullet Mini

• 22.2 in (564 mm)
  • Ibanez Mikro GRGM21

• 22.5 in (572 mm), known as "3/4 scale" in Fender sales literature:
  • Fender Duosonic
  • Fender Musicmaster
  • Fender Mustang
  • Fender Some Musicmaster II and Duosonic II

• 22.72 in (577 mm):
  • Fender Stratocaster Junior

• 22.75 in (578 mm):
  • Gibson 3/4 scale Les Paul Junior and Gibson Melody Maker
  • Ibanez Mikro RGM55
  • Squier Mini

• 23.5 in (597 mm):
  • Gibson Byrdland

• 24 in (610 mm), confusingly called "full scale" in Fender sales literature:
  • Brian May Red Special
  • DGW (Durango Guitar Works) All models
  • Fender Bronco
  • Fender Jag-Stang
  • Fender Jaguar
  • Fender Mustang most models, including current production
  • Fender Most Musicmaster II and Duosonic II
  • Ibanez ORM1

• 24.5 in (622 mm):
  • Mosrite guitars
  • Paul Reed Smith 245 series guitars
  • Paul Reed Smith Santana Signature series

• 24.6 in (625 mm):
  • Gretsch most electric guitars

• 24.75 in (629 mm):
  • Epiphone most electric guitars (including Casino, G-310, G-400)
  • ESP Maverick now it calls ESP MV
  • Fender Cyclone
  • Fender Stratosonic
  • Fender Tele-Sonic
  • Gibson most electric guitars (including Les Paul, most Les Paul Juniors, Flying V, Explorer, SG, Firebird, ES-175, ES-330, ES-335)
  • Gibson ES-150 (original version)
  • Gibson L-20 Acoustic
  • Godin most electric guitars
  • Guild most electric guitars
  • Ibanez Artcore series
  • Rickenbacker most electric guitars (including 330, 340, 350, 360, 370, 380, 620, 650, 660)

• 25 in (635 mm)
  • Danelectro guitars
  • Dobro resonator guitars
  • Patrick Eggle most electric guitars
  • Paul Reed Smith most electric guitars

• 25.125 in (638 mm):
  • Vox Virage II
  • Vox Virage Series 77, 55, 33, 22

• 25.2 in (640 mm):
  • Selmer Maccaferri Grande Bouche Model

• 25.5 in (648 mm), closest to the classical guitar scale:
  • Fender most electric guitars (including Esquire, Telecaster, most Stratocasters, Jazzmaster)
  • Fender Stagemaster 24 Fret Guitars
  • Gibson L-5
  • Gibson Super 400
  • Gibson Johnny Smith Model
  • Gibson J-30
  • Gretsch some models
  • Ibanez most electric guitars
  • Jackson most electric guitars
  • Kramer Striker
  • Schecter 6-string electric guitars
  • Squier most electric guitars
  • Steinberger most electric guitars

• 26.38 in (670 mm):
  • Selmer Petit Bouche Model and most Mirecourt-era Gypsy Jazz guitars

• 26.5 in (673.2 mm)
  • Chapman Guitars ML-7 (both models)
  • Jackson Several 7 and 8 string models including DKA7, DKA8, SLATTXMGQ3-7, and SLATFXQMG 3-8
  • Schecter 7-string electric guitars

• 27 in (686 mm)
  • Agile All models ending in 27. First number is string count. So 627, 727 .. 1027.
  • Carvin DC7X 7-string and DC800 8-string guitar
  • ESP Stephen Carpenter baritone models
  • Fender Jaguar Baritone Special HH (tuned B-B)
  • Gibson Buckethead Signature Les Paul (24 fret oversized Les Paul opposed to traditional 22 fret)
  • Ibanez RG2228 8-string guitar (tuned F#-B-E-A-D-G-B-E)
  • Jackson B7 7-string and B8 8-string guitars
  • Jim Soloway guitars

• 28 in (711 mm)
  • Schecter 8-string electric guitars

• 28.625 in (727 mm)
  • Agile All models ending in 28. First number is string count. So 628, 728 .. 1028.

• 29.25 in (743 mm)
  • Gretsch G6144 Spectra Sonic Baritone

• 29.4 in (749 mm)
  • Ibanez Meshuggah signature 8-string guitars M8M and M80M

• 30 in (762 mm)
  • Agile All models ending in 30. First number is string count. So 630, 730 .. 1030.
  • Legator All 9 string models.

Multi-Scale

• 24.5 in (622 mm) to 27 in (686 mm)
  • Agile All models ending in 2427. First number is string count. So 62427, 72427 .. 102427.

• 24.72 in (629 mm) to 26.5 in (673.2 mm)
  • Partridge Guitars Multiscale

• 25.5 in (648 mm) to 27 in (686 mm)
  • Agile All models ending in 2527. First number is string count. So 62527, 72527 .. 102527.

• 27 in (686 mm) to 28.625 in (727 mm)
  • Agile All models ending in 2728. First number is string count. So 62728, 72728 .. 102728.

• 27 in (686 mm) to 30 in (762 mm)
  • Agile All models ending in 2730. First number is string count. So 62730, 72730 .. 102730.

Electric bass

History

The first electric basses were upright electric basses built in the 1930s by fitting an otherwise normal double bass with electric pickups, and so had a scale length of about 43" (109 cm).

In 1951 the Fender Precision Bass shortened this to 34" (86 cm). This is still often regarded as the standard length for a bass guitar.

On a modern bass guitar, 30" (76 cm) or less is considered short scale, standard (also called long) scale is 34" (86 cm) for a 4-string and 35" (89 cm) for a B-E-A-D-G 5-string, and extra-long scale basses of 36" (91 cm) also exist.

Quite an uncommon scale construction using the Novax Fanned-Fret system that "fan outward" for the ability to play in tune with the unequal scale lengths of each string that is used to find the optimal equal tonal response and equal string tension from string-to-string for easier playing is represented by Dingwall Basses, who uses a 37" to 34" span on their Prima, Z1, Z2, and Afterburner original designs and a shorter 34.25" to 32" span for their "Super J" Jazz Bass design.

Summary

• 25 in
  • Airline Supro pocket Bass

• 28.5 in (724 mm)
  • Fender Jaguar Bass VI Custom

• 30 in (762 mm)
  • Fender Mustang Bass, Fender Bronco Bass, Fender Musicmaster Bass
  • Fender Bass VI, Danelectro 6-strings Bass,Stagg AB203 Acoustic Bass

• 30.25 in (768 mm)
  • Hofner 500 Beatle Bass
  • Mosrite basses

• 30.5 in (775 mm)
  • Gibson EB-1, EB-0, EB-2, and Gibson SG bass(EB-3)
  • Hamer B8S 8-string bass

• 33.25 in (845 mm)
  • Rickenbacker 4000 Series basses

• 34 in (864 mm)
  • Fender Precision Bass, Jazz Bass, Jaguar Bass
  • Gibson Thunderbird Bass
  • Most Ibanez basses
  • Steinberger basses

• 34.5 in (876 mm)
  • Gibson EB-0L and other EB-xL basses

• 35 in (889 mm)
  • Ibanez BTB series basses
  • Yamaha TRB series
• 36 in (914.4 mm)
  • Overwater C Bass (1982) followed by various 5 and 6 string basses
• 39.55 in (1004.57 mm)
  • Knuckle Guitar Works Quake bass

• 42.3–43.3 in (1074.42–1100 mm) full-scale double bass (for comparison; see above about fractional sizes of bowed instruments).

Other chordophones

• Mandola: 20.2 in (51 cm)
• Mandolin: 14.1 in (36 cm)
  • Octave mandolin: 22.75 in (58 cm)
• Ukulele:
  • Soprano ukulele: 13.6 in (35 cm)
  • Concert ukulele: 14.75 in (37 cm)
  • Tenor ukulele: 17 in (43 cm)
  • Baritone ukulele: 20.1 in (51 cm)
  • UBass: 21" in

Piano

Main article: Piano acoustics

The scale length of a piano is quoted as the length of the longest string. As this is normally the lowest bass note, it will be a single string.

Grand piano

Concert grand pianos range in scale from about 7 ft 6 in (229 cm) to 9 ft (274 cm) or occasionally more. Notable concert grands include:

• The Steinway Model D, at 8 ft 11-3/4 in (272 cm).
• The Imperial Bösendorfer, at 9-1/2 feet (290 cm) with 97 keys.
• The Fazioli F308 at 10 ft 2 in (310 cm).

Smaller grand pianos vary in naming. The larger models, about 6 ft (183 cm) or more in scale length, may have the full grand piano action, and are used in smaller concert spaces. Others are intended for larger homes, and may have a simplified action lacking the repeat lever that is only useful for advanced players.

Baby grand pianos are the smallest, intended for homes, restaurants and similar applications where the grand style of piano is desired even at the expense of the longer scale and better sound that an upright format would permit in the available space.

Pythagorean scaling

For the musical (rather than instrumental) scale, see Pythagorean tuning.

Pythagorean scale refers to the relative lengths of strings within an instrument. This kind of scaling dictates that the ratio of string lengths should be equal to the harmonic ratio of their pitches. It is a logarithmic scale which doubles at each octave. This type of scaling was offered under the assumption that by keeping all other factors consistent (esp. string thickness and tension) and changing only length, the sound of the instrument would be homogeneous across its full range.

Because the length of strings increases so quickly in the bass register, it often would produce an instrument of such length as to be impractical. If pythagorean scaling were applied to the stringed instruments, the double bass would be extremely cumbersome. In pianos and harpsichords, generally less tension or thicker strings are used in the lower register to avoid the need for such large dimensions as demanded by a Pythagorean scale.

See also

• Fingerboard
• Multi-scale fingerboard

Additional reading

• "Lutherie Info – Measuring Scale Length of Stringed Instruments" by R.M. Mottola, on the Liutaio Mottola Lutherie Information Website.
• "Fender's 3/4 Scale Guitars", a two-part article by Tim Pershing in 20th Century Guitar magazine, December 1996 and January 1997.

External links

• Instrument plans index gives some scale lengths.
• scale lengths - discussion of the effect of scale length.
• Bass guitar buying guide discusses scale length.
• Vintage guitars with dimensions.
• Listing of some orchestral basses giving both body and scale lengths.
• Real Guitar Solo
• Road Toad Music's UBass Page