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Classical Guitar String Tensions

This table shows the tensions that result from the different gauges available for the classical guitar. The string length is assumed to be about 64.75cm. There are two tables. One lists tensions at the pitch of a=415 and the other lists tensions at the pitch of a=440. If the string length on your instrument is a little longer, then the tension will be a little more. If the string length on your instrument is a little shorter, then the tension will be a little less.

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    Diameter Tension
Note   in mm in Kg
Guitar e-1 treble gut a=415
e Light .62 6.60
e Medium .64 7.00
e Heavy .66 7.40
Guitar b-2 treble gut a=415
b Light .82 6.40
b Medium .84 6.70
b Heavy .86 7.00
Guitar g-3 Lyon gut a=415
g Light 1.00 6.70
g Medium 1.02 7.00
g Heavy 1.04 7.30
Guitar D-4 Gut core wound strings a=415
D Light .80 5.68
D Medium .82 5.89
D Heavy .84 6.11
Guitar A-5 Gut core wound strings a=415
A Light 1.04 5.68
A Medium 1.06 5.89
A Heavy 1.08 6.11
Guitar E-6 Gut core wound strings a=415
E Light 1.36 5.68
E Medium 1.38 5.89
E Heavy 1.40 6.11

 

Guitar string tensions a-440

    Diameter Tension
Note   in mm in Kg
Guitar e-1 treble gut a=440
e Light .62 7.20
e Medium .64 7.70
e Heavy .66 7.80
Guitar b-2 treble gut a=440
b Light .82 7.20
b Medium .84 7.60
b Heavy .86 7.80
Guitar g-3 Lyon gut a=440
g Light 1.00 6.37
g Medium 1.02 7.00
g Heavy 1.04 7.30
Guitar D-4 Gut core wound strings a=440
D Light .76 6.37
D Medium .78 6.61
D Heavy .80 6.85
Guitar A-5 Gut core wound strings a=440
A Light .90 5.42
A Medium .92 6.57
A Heavy .94 6.77
Guitar E-6 Gut core wound strings a=440
E Light 1.06 5.42
E Medium 1.08 5.57
E Heavy 1.10 5.73