Work out string tension instantly with clear inputs, formula shown and shareable results.
The standard string tension formula is T = unit weight x (2 x scale length x frequency)^2 / 386.4, where 386.4 is gravitational acceleration in inches per second squared. Because tension rises with the square of both length and pitch, moving from a 25.5 inch to a 27 inch baritone scale at the same pitch adds over ten percent tension.
String tension
T (lb) = unit weight x (2 x L x f)^2 / 386.4
T (lb) = unit weight x (2 x L x f)^2 / 386.4. The standard string tension formula is T = unit weight x (2 x scale length x frequency)^2 / 386.4, where 386.4 is gravitational acceleration in inches per second squared.
Because tension rises with the square of both length and pitch, moving from a 25.5 inch to a 27 inch baritone scale at the same pitch adds over ten percent tension.
Enter scale length, string unit weight, pitch frequency. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.