Finding the right gauge of guitar string can be a challenge when you venture out of standard tuning.
Fortunately, my folks @Stringjoy have provided an easy solution for selecting the perfect gauges for your guitar and preferred playing style when you drop tune your guitar.
Watch this short clip and then head to the Stringjoy String Tension calculator to play around with some different string gauge combinations and find exactly what you need.
Here is the link to the tension calculator!