Source: MPUSTC String Tension Calculator
The McDonald Patent Universal String Tension Calculator (MPUSTC) is a handy calculator to figure string tensions in steel-string instruments. If you plug in your scale length, string gauges and tuning, it will give you a readout of the tension on each of the strings. This is useful when you’re trying to fine-tune a set of custom gauges, or when you’re working out how far you can push a drop tuning before it becomes unmanageable.
It has presets for a whole range of instruments, and you can alter gauges and tunings to your heart’s content.
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