Tools you might need next
Estimate fish weight from length and girth measurements using species-specific formulas when you do not have a scale on the water.
Calculate optimal trolling speed in mph and knots for target fish species, lure type, and desired lure running depth on lakes or oceans.
Compare fishing knot breaking strength as a percentage of line rating for Palomar, Uni, FG, and other popular terminal connections.
Line rating is break strength in lab conditions. Knots and abrasion reduce real-world strength 20% to 50%.
Set drag to a fraction of line test so fish runs do not snap the line at the knot.
recommended line test ≥ max drag setting / 0.25 to 0.33Leaders are often lighter or heavier than main line depending on visibility, abrasion, and shock needs.
Updated: July 2026
Choose 20 lb braid with 25 lb fluorocarbon leader for structure and clear water.
Select 4 to 6 lb mono for finicky bites in small streams.
Scale line test to expected fish weight and drag on lever-drag reels.
Knots fail below lab break strength. Leave margin and set drag lower.
Match leader to water clarity, cover, and mouth structure of the target fish.
Match line test to your quarry and tackle. Enter target species, technique, and reel drag to get recommended main line and leader strength.