Fly line weight conversion chart
Leader to line-test conversion chart
Tippet size to hook size
Parts of a leader
Fishing knots
Preparing, using and maintaining the line



Fly line weight--grains to grams to ounces
Total weight of first 30 feet of line AFTM (Association of Fishing Tackle Manufacturers) standard, +/- variation in weight possible with any line rating.
Line------Grains------Grams------Ounces
2....................80..................5.18..................0.182
3..................100..................6.48..................0.228
4..................120..................7.78..................0.274
5..................140..................9.07..................0.320
6..................160..................10.42................0.366
7..................185..................11.99................0.422
8..................210..................13.61................0.480
9..................240..................15.55................0.550
10................280..................18.14................0.640
11................330..................21.38................0.750
12................380..................24.62................0.860

Leader to Line-Test Conversion Chart
Due to differences in leader and tippet material from suppliers, all measurements are an approximate diameter/test. Some diameters may test higher or lower than found on this chart.

Leader__________Diameter__________Line-Test
XXX........................0.028........................55
XXX........................0.026........................50
010X.......................0.021.......................40
08X.........................0.020.......................38
07X.........................0.019.......................35
06X.........................0.018.......................30
05X.........................0.017.......................25
04X.........................0.016.......................20
03X.........................0.015.......................18
02X.........................0.014.......................17
01X.........................0.013.......................16
00X.........................0.012.......................15
0X...........................0.011.......................14
1X...........................0.010.......................12
2X...........................0.009.......................10
3X...........................0.008.........................8
4X...........................0.007.........................6
5X...........................0.006.........................4
6X...........................0.005.........................3
7X...........................0.004.........................2
8X...........................0.003.........................1

Tippet Size to Hook Size

Tippet is the final section of line connected to the leader. Use the proper tippet size to enable proper turnover of the fly. Using a small fly with a heavy tippet will ruin a delicate presentation. Using a light tippet with a heavy fly prevents proper turnover on the forward cast and will result in a horrible tangle.
Tippet Size
----------Hook Size
05x.........................5/0, 4/0, 3/0, 2/0
04x.........................3/0, 2/0, 1/0, 2, 4
03x.........................1/0, 2, 4
02x.........................1/0, 2, 4, 6, 8
01x.........................1/0, 2, 4, 6, 8, 12
0x...........................2, 4, 6
1x...........................4, 6, 8
2x...........................6, 8, 10
3x...........................10, 12, 14
4x...........................12, 14, 16
5x...........................14, 16, 18, 20
6x...........................16, 18, 20, 22, 24
7x...........................18, 20, 22, 24, 26, 28
8x...........................22, 24, 26, 28

Parts of a leader

Basic formula for a tapered leader is 50 percent of the total length should be for the butt section, 25 percent for the tapered body and the final 25 percent for the tippet. So for a standard 9 feet long leader, about 3 to 4 feet would be a butt section, followed by a gradual taper down to your tippet section, usually about 18-inches to 3 feet of tippet.

Butt: This section is attached to your fly line, either directly or loop-to-loop. This section is made up of the heaviest line and transfers energy from your cast to the leader. The butt section should be neither too limp or too stiff.

Middle: The line diameter tapers down in size to transfer energy from the fly line.

Tippet: This is the lowest breaking strength line in your setup. Generally tippet lengths should be between 16 to 24 inches long.

SUGGESTIONS
Generally the leader should be equal to or a bit shorter than the length of your rod. However for fishing very still water or very spooky fish (or both) you need to lengthen your leader and tippet out to 12-14 feet (sometimes longer).
Use short leaders on sinking lines. Sometimes a straight length of 3-5 feet of straight leader will work.
In strong wind, use a short leader.
In dirty water use a short leader.
If you're using a shooting head, use a short leader with a slight taper.

Generic leader formulas
These are examples of a 'normal' trout leader and a heavy leader for large freshwater or saltwater species. Note that the trout leader has a very graduated taper. You can control the turnover and presentation of your fly by adjusting the taper (center portion) of the leader and lengthening or shortening the tippet (but no shorter than 18 inches). Do not mix leader material. If you start with one brand the whole leader and tippet should be made from the same type of line. Do not mix line manufacturers. Some examples are given below (and please note that these are examples and not a 'you-gotta-tie-it-this-way' recommendation).

9' Tapered generic trout leader, general purpose
40 lb.-36inches 35 lb.-16 inches 25 lb.-12 inches 18 lb.-6 inches 16 lb.-6 inches 14 lb.-6 inches 10 lb.-6 inches 6 lb.-20 inches (tippet)

9' Heavy generic fresh/salt leader for large, heavy flies
40 lb.-36 inches 30 lb.-24 inches 25 lb. 12 inches 20 lb.- 12 inches 15 lb.- 24 inches (tippet)

Fishing Knots
Go to Animated Knots by Grog for an excellent animated tutorial on how to tie common knots you'll use when fishing. This is a great site to also learn boating and climbing knots too!

Preparing, using and maintaining the line
Before spooling on your fly line make sure you don't have too much backing on your reel, especially if you are using a dual taper line. Some people wind the fly line on first then the backing so you get the correct yardage on the reel. The only drawback to this method, although accurate, is taking everything off and reversing the procedure. Some high end fly reels often have a maximum backing mark on the reel which takes the guess work out of everything. However after the backing and fly line are on the reel, there should be enough space so that the line does not bind on any part of the reel when you rotate the spool.

After loading the fly line on the reel, pull the line off the spool and using your thumb and forefinger, lightly hold the line and walk out towards the end and allow any coils to unwind. Do this several times then reel up the line.

When you fish the line, pull off whatever length you intend to cast and gently give it a light stretch to remove the coils. Do not grasp a section and jerk on it. Don't step on one end and pull on it. The stretching relieves a set that the line took on the reel spool. This is especially important when fishing on a cold day.

After a few hours of fishing you line will develop a twist. Every time you cast and don't fire out all of the line you removed from the spool, you're introducing twist. Twist cannot be removed by stretching the line. Remove the fly and make a long cast and get all the line you initially removed out the tip of the rod. Slowly wind the line in while applying a light pinch on the line with your thumb and forefinger. The line will roll as you retrieve and all the twists will unwind but you must remove the fly so the leader can roll. Another way to remove line twist is to grasp the rod at the first stripping guide (large guide above the handle) and by the reel seat butt and quickly rotate the rod counterclockwise (if you cast right handed) about ten to 15 times. If it added more twist, reverse your direction a few times until the line is straight.

Do not handle your fly line if you've applied bug repellent that contains DEET, sunscreen, any solvents or gasoline. Do not leave your fly line on the dashboard of your car or in your trunk during summer.

Clean and lubricate your line on a regular basis. How often is regular? I tend to clean my lines after every fishing session, especially if it's in salt water. Minute dirt particles or salt work their way into the pores of the line as you fish and will affect the way the line floats and casts. If you see the tip of your floating line begin to sink or if the line doesn't shoot easily, then it needs cleaning.
Neatly (I use a line-winder) pull your line off the reel and use a few drops of mild detergent or Ivory soap to wash the line under warm or cool water. Pat dry. Use a good quality line cleaner followed by a line dressing. Do not slather the dressing all over the line. Less is best. All you need are a few drops on a clean cloth or pad.