What does knot efficiency mean?

Knot efficiency is the percentage of the line's straight-pull breaking strength that the knot retains. Every knot weakens the line where it bends and grips, so an 85 percent efficient knot on 20 lb line breaks at roughly 17 lb at the knot.

Which knot is strongest?

For terminal connections, the Palomar is famous for retaining close to full line strength when tied correctly. Line-to-line, the FG knot and Bimini Twist can approach or exceed 90 to 100 percent because they distribute load over many wraps. Exact results depend heavily on tying technique and lubrication.

Why does line type change the result?

Slick braided line and stiff fluorocarbon hold knots differently than supple monofilament, so the same knot can sit at a different efficiency on each. The tool applies a small adjustment per line type, but real performance varies by brand, diameter, and how well you cinch and wet the knot.

How accurate are these percentages?

They are representative averages from angler testing, not guarantees. A sloppily tied knot, a nicked line, or a dry cinch can drop efficiency dramatically. Always wet your knots before tightening and test important rigs by hand before trusting them to a big fish.

Should I size my knot strength to my target fish?

Yes. Estimate the knot break strength, then compare it to the drag setting and the likely fight load. A knot that retains most of your line test gives you margin for sudden runs and headshakes; a weak knot becomes the failure point long before the line itself.

Fishing Knot Strength Calculator

Every knot is weaker than the line it is tied in, and that weakness is where most break-offs happen. This tool estimates the breaking strength of your finished connection by applying a knot’s typical efficiency to your line’s rated test, so you can pick a strong knot and know roughly how much pull it will hold.

How it works

Each knot has a representative efficiency — the fraction of the line’s straight breaking strength it retains. The estimate is simply:

knot break strength = line test × knot efficiency × line-type factor

Line-type factors nudge the base efficiency up or down a little for braid, monofilament, or fluorocarbon, since slick or stiff lines hold knots differently. The result is an estimate of the load at which the knot, rather than the open line, gives way.

Example and tips

A Palomar knot at about 95 percent efficiency on 20 lb braid yields an estimated break strength near 20 × 0.95 = 19 lb. Choose a high-efficiency knot when you are fishing close to your line’s limit, and always wet the knot before cinching it down — friction heat from a dry pull can weaken even a well-formed knot. Treat these figures as guidance and hand-test critical rigs before the cast.