Fly Line Weights In Grains

Standard fly line weight charts give us parameters for specific fly line sizes.

Fly line weights in grains.

We have listed the fly line weights as they relate to actual weight of the fly line in grains or grams. The table below provides the official measurements in both grains and grams. Here is a fly line wt chart that shows you the average grains of weight in the first 30 ft or head of your line. For instance a certain 5 weight line might have a 30 foot head weight remember fly lines are measured for grain weight in the first 30 feet of 160 grains which seemingly should make it a 6 weight line if following industry standards.

While most anglers simply use the general line weight measure when matching a line to a rod occasionally more detailed information is useful. The american fly fishing trade association affta provides standardized weights for fly lines which you can find below. A good friend of mine capt dave chouinard showed me this chart and it is a great example of how much there is to learn about fly lines.