JDM PE Line and Leader Ratings: Gou to Pounds, Explained

If you’ve started buying Japanese tackle, you’ve run into a wall the spec sheet never warns you about. Your new reel says it holds “PE 1.5 / 200m.” The braid on the shelf is labeled “0.8号.” The leader spool reads “3号 / 12lb.” None of those numbers is a pound test, and that trips up almost every angler coming from the US or Australia. The good news is that the Japanese system is actually more logical than the one you grew up with, once you know what it’s measuring.

This guide breaks down the gou (号) rating used for both braid and leader, shows why there’s no single “PE to lb” number that works everywhere, and gives you practical charts plus real pairings for tairaba, light jigging, shore jigging, and eging. If you’ve already read our explainer on JDM reel size numbering, this is the line-and-leader companion to it.

A quick word on where I’m coming from. I fish tairaba and light jigging from a small boat here in Japan, so gou is just the language on every spool I own. What I can’t do is promise the exact breaking strain of your specific line, and by the end of this you’ll understand why nobody honestly can. What I can do is show you how to read the numbers and rig with confidence.

What “Gou” Actually Measures

Gou (号 / ごう) is a Japanese sizing unit built around diameter, not strength. The system goes back to 1947, when Toray set 1号 equal to a monofilament diameter of 0.165mm. The Japan Fishing Tackle Manufacturers Association (JAFTMA) later formalized it, and in 2010 it published a common standard covering nylon, fluorocarbon, and polyester lines. Every step up the scale is a thicker line: 2号 is roughly twice the cross-section of 1号, and so on.

That’s the key mental switch. A gou number tells you how thick a line is, the same way a pound test tells an American angler how strong it is. Thickness matters enormously in Japanese styles: it sets how far a light jig casts, how little a tairaba rig gets pushed around by current, and how much line a small counter reel can pack onto a shallow spool. Japanese anglers optimize for diameter first and treat strength as a consequence.

Why There’s No Fixed PE-to-Pound Conversion

Here’s where the internet’s conversion charts quietly mislead you. PE braid is also labeled in gou, but braid strength depends on the fiber, the number of strands, and how tightly it’s woven. Two spools can both read “PE 1.0” and break at very different weights. A budget 4-strand might hold 16lb while a premium 8-strand of the same 1.0号 diameter tests past 20lb. Same number on the label, different pound test in your hand.

The rule of thumb you’ll see quoted is that braid breaks at roughly ten times its PE number, so PE 2.0 lands somewhere near 20lb and PE 5.0 near 50lb. Treat that as a rough floor rather than a promise. Modern Japanese 8-strand lines frequently beat it, and cheaper lines can fall short. This is exactly why the honest answer to “what’s PE 1.5 in pounds?” is a range, not a single figure. Always read the actual breaking strain the maker prints on the box.

Leader is more predictable because mono and fluorocarbon are single strands. For those, gou converts to pounds at roughly four times the number: a 3号 leader is about 12lb, a 5号 about 20lb. Fluorocarbon usually tests a touch below that four-times figure, since it’s a little weaker than nylon at the same diameter, but it’s close enough to rig by.

PE Braid: A Working Gou-to-Pound Chart

Use the table below as a starting reference for typical Japanese 8-strand braid. Diameters follow the JAFTMA nominal figures and are consistent between brands. The pound ranges are deliberately wide because, as above, strength varies by construction. Confirm the printed rating before you commit to a fish.

Notice how the diameter climbs slowly while the strength climbs fast. That’s the whole appeal of good braid: you get more pulling power without the thickness penalty that a thicker mono would cost you in casting distance and current resistance.

Leader Ratings: Fluorocarbon and Nylon in Gou

Japanese leader material is sold in gou too, and here the four-times rule holds up well. Because leader is a solid strand, the diameter and strength track together far more tightly than braid does. One thing to watch: a fluorocarbon leader and a braid can share the same gou number and still differ in diameter, which is why a reel’s stated line capacity in gou refers to a specific line type. Don’t assume “3号” on your braid and “3号” on your leader are the same thickness.

Fluorocarbon is the default leader for most Japanese boat styles because it sinks, resists abrasion on a fish’s teeth and gill plates, and disappears in clear water. Nylon shows up where a little stretch and buoyancy help, such as topwater work. For tairaba, light jigging, and eging, assume fluoro unless a guide tells you otherwise.

Matching PE to Leader (and to Your Target Fish)

A balanced rig pairs a leader that’s a bit stronger than your braid, so the knot and the abrasion zone can take a hit before the main line does. In practice, Japanese anglers set the leader’s pound rating at roughly the same as, or a little above, the braid’s real breaking strain. Start from the technique, not from a formula. Here’s how the numbers land for the styles this site covers.

• Tairaba (madai / red sea bream): PE 0.8–1.0 with a fluoro leader around 3–4号 (12–16 lb). Thin line keeps the rig ticking along the bottom in current. See the complete guide to tairaba fishing for the full setup.
• Light jigging from a boat: PE 1.0–1.5 with fluoro 4–6号 (16–25 lb) covers most amberjack, hardtail, and grouper down to moderate depth. Our light jigging guide and the matching JDM light jigging reels use exactly this range.
• Shore jigging (LSJ and up): PE 1.0–1.5 with fluoro 5–7号 (20–30 lb) for light shore work, stepping up to PE 2–3 and 8–10号 leader when kingfish or tuna are on the cards.
• Eging (squid): PE 0.6–0.8 with a fluoro leader of 2–2.5号 (8–10 lb). Squid don’t pull hard, so this is about casting the egi and feeling the jig, not brute strength.

These are starting points, not laws. Heavier current, deeper water, or bigger fish all push you up a size. When in doubt, match what the reel spool and the technique guides recommend, then adjust after a trip or two.

How Gou Connects to Reel Line Capacity

This is where the diameter-first logic pays off. A JDM reel lists capacity as a gou number times a length, like “PE 1.0 / 300m” or “PE 2 / 200m.” Because gou is a fixed diameter, that spec tells you precisely how much of a given line thickness the spool holds, regardless of brand. It’s the same reasoning behind the size codes on the reel itself, which we cover in the JDM reel size numbering guide.

Two practical notes. First, capacity is quoted for braid at that gou, so your fluorocarbon leader (thicker per gou in practice) doesn’t map one-to-one. Second, “shallow” or “SH” spools are built around thin PE on purpose, which is why a small tairaba or light-jigging reel can still carry plenty of 0.8–1.0号. If a US-market version of the same reel lists capacity only in yards of pound-test mono, that’s your sign the spec was translated for a different market.

Buying JDM Line and Leader from Abroad

Most serious Japanese braid brands, YGK, Varivas, Sunline, and Duel among them, are the reason JDM anglers obsess over line at all. Some of their lines reach Amazon.com; many stay domestic. If you want to browse what ships internationally, this search for Japanese PE braid on Amazon.com is a fair starting point, and you can price a fluorocarbon leader on Amazon Japan for the JDM-only spools. Ships internationally from Amazon Japan: check availability and shipping cost at checkout.

One buying tip that saves grief: note both the gou and the printed pound test before you order. Because the pound rating varies by brand, the number on the box is the only figure you can trust across the whole shelf. For the shipping, customs, and proxy details, see our full walkthrough on how to buy JDM tackle overseas.

FAQ

What is PE 1.0 in pounds?

Roughly 10 to 20 lb, depending on the line. PE 1.0 is a diameter (about 0.165mm), not a strength, so the pound test moves with the fiber and strand count. A premium 8-strand at PE 1.0 often tests near 18–20 lb, while a basic line sits lower. Always check the breaking strain on the box.

How do I convert leader gou to pounds?

Multiply the gou number by about four. A 3号 leader is roughly 12 lb and a 5号 about 20 lb. Fluorocarbon usually tests a shade under that, since it’s slightly weaker than nylon at the same diameter, but it’s close enough for rigging.

Why do two PE 1.5 lines have different pound ratings?

Because gou fixes the diameter, not the strength. A tightly woven 8-strand line packs more working fiber into the same 1.5号 thickness than a cheaper 4-strand, so it breaks at a higher weight. That’s normal, and it’s why the label’s stated pound test matters more than the gou number when you’re picking line for a target fish.

Should my leader be stronger than my braid?

Usually yes, or at least equal. The leader takes the abrasion near the lure and absorbs shock, so setting it at roughly the same pound rating as your braid’s real strength, or a touch above, protects the main line. A common tairaba setup is PE 0.8 braid with a 3号 (about 12 lb) fluoro leader.

Wrap-Up

Once you stop reading gou as a pound test and start reading it as a diameter, the whole Japanese system clicks. Braid gou tells you thickness and casts a wide net on strength; leader gou converts cleanly at about four times the number; and the two don’t have to match. Pick your line by the technique, trust the printed breaking strain over any chart, and pair a slightly stronger leader on top.

From here, the natural next steps are the gear guides that use these exact line ratings. Start with the English top page and pick the technique you’re rigging for, whether that’s tairaba, light jigging, or shore jigging.

ちゃんま

なんでも釣り師

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マイボートで海に出るボートアングラー（釣り歴20年・ボート歴10年）。タイラバ・ひとつテンヤ・ライトジギングが主戦場で、エリアトラウトや堤防のライトゲームものんびり楽しむ雑食派。

実際に使った道具の「正直どうだったか」を、公式スペックと実釣の両面から書いています。

Boat angler based in Japan, sharing first-hand reviews of JDM tackle.