Below is a chart to convert or compare fly line weight to grains.This applies to the first 30 feet of line, minus the level tip. Fly Line Weight Weight In Grains Grain Wt. Tolerance Fly Line Weight Specification 1 60 +/- 6 2 80 +/- 6 3 100 +/- 6 4 120 +/- 6 5 140 +/- 6 6 160 +/- 8 7 185 +/- 8 8 210 +/- 8 9 240 +/- 10 10 280 +/- 10 11 330 +/- 12 12 380 +/- 12 13 450 +/- 15 14 500 +/- 15 15 550 +/- 15
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