OhMyCalc

Line Strength Calculator

Calculate the recommended fishing line strength (lb test) and diameter based on target fish weight.

How to Use the Line Strength Calculator

  1. Enter the expected weight of the fish you are targeting.
  2. Select the fishing type (freshwater, saltwater, or fly).
  3. Click Calculate to see the recommended lb test and line diameter.
  4. Choose a line that meets or exceeds the recommended strength.

Casos de Uso

Fórmula

Recommended lb test = Fish weight (kg) × 2.205 × multiplier. Multiplier: freshwater ×2.0, saltwater ×2.5, fly ×1.5. Diameter ≈ √(lb test) × 0.055 mm.

Perguntas Frequentes

What lb test should I use?
As a rule of thumb use 2× the fish's weight in pounds for freshwater, 2.5× for saltwater.
Does fishing type affect line choice?
Yes. Saltwater fish are often stronger fighters and corrosion is a factor, requiring heavier line.
Is it free?
Yes, all calculators on OhMyCalc are completely free.