Additional FFR calculators include: a

fly depth calculator to estimate fly depth at hangdown for various sink tips, lengths, and water conditions; a

tip length calculator to estimate length of sink tip required to deliver your fly to a given depth at hangdown; a

sink tip converter to convert multiple sink tips of your choosing to equivalent lengths of a standard sink tip of your choosing; and an

Archimedes diameter calculator to find the diameter, sink rate, rule number, and density of a fly line when the most accurate measurements are desired.