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 |
|---|---|---|
| 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 |