How to Determine the Line Weight for Your Fly Rod

Fly line is referred to by the manufacturer in terms of its weight and is measured in grams. A number is assigned to the gram weight and ranges from 1 to 14. Size 1 fly line is the lightest and is best suited for casting tiny flies such as a midge. Size 14 line is suited for the heaviest bass or saltwater flies. Fly line must be matched to a rod for proper handling.

Things You'll Need

  • Fly line
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Instructions

    • 1

      Hold the fly rod sideways and locate the manufacturer's information printed on the side of the rod just above the handle.

    • 2

      Look for numerical markings followed by the word "weight" or abbreviated by "WT" or "#."

    • 3

      Identify the weight of the rod, such as a 5 weight (WT/#) or a 7 weight (WT/#).

    • 4

      Choose a fly line with a number that matches the number on the fly rod. Match a 5 weight fly line to a 5 weight rod, for example.

    • 5

      Select a fly line with properties that match your fishing style or level of expertise. Choose a weight forward (WF) fly line to help with casting, a level (L) line that has an even diameter the entire length or a double taper (DT) that becomes gradually smaller toward the tips.