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.
Effective Breaking Strength
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 | Strength | Best Use |
|---|---|---|
| Palomar | 95–100% | Hooks, lures — easiest strong knot |
| Uni Knot | 90–95% | Terminal tackle, joining lines |
| Improved Clinch | 85–90% | Hooks, swivels — most common |
| Trilene Knot | 90–95% | Similar to clinch but stronger |
| Blood Knot | 80–90% | Joining lines of similar diameter |
| FG Knot | 95–100% | Braid to fluorocarbon leader |
| Surgeon’s Knot | 85–90% | Quick line joining |
| Loop Knot (Rapala) | 90–95% | Lures requiring free movement |
| Snell Knot | 90–95% | Terminal tackle with eyeless hooks |
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.