Recommended by some members at the August LINT meeting,
StringForce is a free App for Smart phone and tablets. It calculates adapted string diameters for alternative tunings in order to keep a balanced force distribution over the strings, reduce the risk of string breakage or poor tone, volume or intonation, and maintain the correct factory-recommended force on the guitar's neck.
The App loads well and seems to work as advertised. Hopes this helps in your calculations. Let us know if it works for you.
Luthiers Interactive of North Texas is a club of like-minded individuals, located in the North Texas area, sharing the joy and craft of building stringed instruments.
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