CalcLine is a free Android application developed by Sea Angler that helps calculate the amount of fishing line required to supply fishing reels. It is a small, simple and easy-to-use application that is designed to perform three main calculations.

The first calculation is to determine the amount of backing required to complete the spool. This calculation requires the capacity of the reel, which is usually printed on the body of the reel or spool.

The second calculation is to determine the amount of line that the spool can carry for several line diameters. This feature is particularly useful when switching from one type of line to another.

The third calculation is to determine the capacity of the spool when this information is unknown or is doubtful. This calculation requires the dimension of spool, including length, inner diameter and outer diameter.

Overall, CalcLine is a great application for anglers who want to ensure they have the right amount of fishing line for their reels. It is a simple and effective tool that is completely free and contains no ads.