Fishing Knot Strength Calculator

Braided line is thin, round, and slick, so a knot that relies on friction to hold — like the Improved Clinch — can slip under load and retain far less of the line's rated strength than it would on textured monofilament. Fluorocarbon sits in between: it's stiffer than mono, which affects how tightly a knot cinches down.

Yes — effective strength is calculated as a fixed percentage of your line's rated test strength for the chosen knot and material, so it scales up and down linearly and directly with the test rating you enter. Doubling the rated strength doubles the effective strength at the knot.

The Palomar consistently retains the highest percentage of rated line strength across monofilament, fluorocarbon, and braided line alike, because its doubled-line loop and tight cinch distribute tension evenly rather than concentrating it at a single wrap, which is why it's frequently recommended as a default knot for most rigging situations.

The Blood Knot is a line-to-line joining knot rather than a terminal knot tied to a hook or lure, and its multiple twisted wraps create more friction points where the line can be nicked or weakened during tying, which is reflected in both its lower strength retention and its harder-to-tie ease score in this calculator's tables.

It applies a static lookup table of typical strength-retention percentages and cannot account for line age, sun and UV exposure, nicks from structure or fish teeth, or an imperfectly tied knot — any of these reduces real-world breaking strength below the estimate shown here, so treat the result as a best-case comparison, not a guarantee.