Fishing Line Strength and Knot Calculator
Calculate effective fishing line strength after knot loss.
Most fishing knots reduce line strength by 15-30%.
Find the right line test for your target fish.
Effective Line Strength
Fishing line is rated by its breaking strength in pounds (lb test) or kilograms. However, knots reduce this strength significantly. Knowing effective strength after knotting helps match your tackle to your target fish.
Knot efficiency by type:
- Palomar knot: 95% efficiency (best for braided line)
- Improved clinch knot: 85–95%
- Uni knot / Duncan loop: 85–90%
- Blood knot: 80–85%
- Trilene knot: 90–95%
- Simple overhand knot: 50% (never use for terminal tackle)
Effective strength = Line test × (knot efficiency / 100)
General line selection guidelines:
- Panfish (bluegill, crappie): 4–6 lb test
- Bass: 8–17 lb test (fluorocarbon or mono)
- Walleye/pike: 10–20 lb test
- Salmon/steelhead: 15–30 lb test
- Offshore (tuna, mahi): 30–80 lb test
- Shark, billfish: 80–200 lb test
Always use the lightest line that will safely land your target fish — heavier line is more visible and reduces lure action. Braided line has nearly zero stretch, which improves sensitivity but requires shock leaders on hard-fighting fish.