Fishing Knot Strength Calculator
Compare fishing knot strength as a percentage of line breaking strength.
Find which knots retain the most line strength for your application.
A fishing knot is always the weakest point in your tackle system. Knot strength is expressed as a percentage of the unknotted line’s rated breaking strength. A “100% knot” retains the full rated breaking strength - virtually impossible in practice. Most good fishing knots achieve 85–98%.
Common knot strengths:
| Knot | Published range | This calculator uses | Best Use |
|---|---|---|---|
| FG Knot | 95–100% | 97% | Braid to fluorocarbon leader |
| Palomar | 95–100% | 95% | Hooks and lures, the easiest strong knot |
| Trilene Knot | 90–95% | 93% | Similar to the clinch but stronger |
| Uni Knot | 90–95% | 92% | Terminal tackle, joining lines |
| Loop Knot (Rapala) | 90–95% | 92% | Lures that need free movement |
| Snell Knot | 90–95% | 92% | Terminal tackle with eyeless hooks |
| Surgeon’s Knot | 85–90% | 88% | Quick line joining |
| Improved Clinch | 85–90% | 88% | Hooks and swivels, the most common knot |
| Blood Knot | 80–90% | 85% | Joining lines of similar diameter |
Published figures move around by several points depending on who ran the test and how, which is why the middle column is a range. The ordering is far more reliable than any single number in it. The same table drives the line strength calculator, so the two pages agree.
Why knots weaken line:
- Tight wraps create stress concentrations that cut into the line fiber
- Friction heat during tightening can weaken monofilament and fluorocarbon
- Monofilament is most affected; braid retains more strength through knots
- Wet your knot with saliva or water before cinching to reduce heat
Practical tip: The knot you tie consistently and correctly is usually better than a theoretically superior knot tied poorly. Practice until you can tie your chosen knot in low light with cold fingers.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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