Pound test

Also called lb test, breaking strain, line strength

What is pound test?

The rated strength of a line, meaning roughly the straight pull in pounds it should hold before breaking.

Panfish and trout: 4 to 8 lb
General bass: 10 to 12 lb
Heavy cover, catfish, pike: 20 lb and up
Strength lost to a knot: 20% to 40%; Even a well-tied one

What does the pound test number actually measure?

The number on the spool is a manufacturer's rating for a straight, steady pull on new line under lab conditions. Real fishing is not that. A knot takes 20 to 40 percent of the strength away, a nick from a rock takes more, sunlight degrades nylon over a season, and a sudden shock load is nothing like a steady pull.

Treat it as a comparison between spools rather than a promise about the fish you will land. The line rated 12 is stronger than the line rated 8 from the same maker; neither will hold 12 or 8 pounds hanging off a knot after a season in the sun.

Is heavier line always better?

No, and this is the mistake that costs beginners the most bites. Thicker line casts shorter, is more visible, and puts more drag in the water, which changes how a lure runs and how deep a crankbait gets. It also means that when you snag, something has to give, and if the line is stronger than your rod you will find out which part that is.

Match the line to the rod's line rating and to the cover you are fishing, not to the biggest fish you can imagine hooking.

Why is braid rated differently?

Braid ratings confuse things further, because braid is usually underrated and is sold against a mono-diameter equivalent rather than its own thickness. A line sold as 30 pound braid frequently tests well above that, and has roughly the diameter of 8 pound mono, which is part of why people spool such heavy braid without thinking about it.

This is why diameter, where it is printed, is the more useful number when you are comparing two spools of different types.

In practice

Six to eight pound for panfish and trout, ten to twelve for general bass fishing, twenty and up for heavy cover, catfish and pike.

What this means when you’re choosing

The rod's line rating first. A rod marked 6 to 15 lb is telling you the band where the blank protects the line and the line protects the blank.
Stated diameter in millimetres or thousandths alongside the pound test, which is the only way to compare a braid against a mono honestly.
IGFA class line if you ever intend to submit a record. Class line is tested to break at or below its stated rating, which is the opposite of how ordinary line is built.

The common mistake

Buying the heaviest line the reel will hold

Heavier line feels like insurance and mostly costs you bites. It casts shorter, is easier to see, keeps crankbaits from reaching their rated depth, and turns every snag into a choice between losing a lure and damaging the rod tip. Fish the lightest line the cover allows, and let the drag do the work the extra pounds were supposed to do.

Common questions

What pound test line should a beginner use?

Eight pound covers most freshwater beginner fishing. Drop to four or six for panfish and stocked trout, and go to twelve or heavier only when you are fishing wood, grass or catfish.

Does a knot weaken fishing line?

Yes. Even a correctly tied knot costs roughly 20 to 40 percent of the line's rated strength, which is why line almost always breaks at the knot rather than in the middle of a cast.

Where this is defined

IGFA World Record Requirements: line class regulations, International Game Fish Association

Where this comes up

The guides that use pound test and show it on real gear.

Last reviewed August 22, 2026. Pound test is one of 222 terms in the fishing glossary.