Approximate values
Fishing Line Diameter Chart
A field approximation by pound test, plus the JAFTMA standard diameter for Japanese gou size.
Reference chart
Approximate diameter by material
| Test | Mono mm | Fluoro mm | Braid mm | Typical PE |
|---|---|---|---|---|
| 6 lb | 0.23 | 0.22 | 0.13 | 0.6–0.8 |
| 8 lb | 0.27 | 0.25 | 0.15 | 0.8–1.0 |
| 10 lb | 0.30 | 0.28 | 0.17 | 1.0–1.2 |
| 15 lb | 0.36 | 0.33 | 0.21 | 1.5 |
| 20 lb | 0.41 | 0.37 | 0.24 | 2.0 |
| 30 lb | 0.50 | 0.45 | 0.29 | 2.5–3.0 |
The pound-test table is a field approximation. The United States does not publish one diameter for each pound test. Approximate only. Check the spool label before you match a leader or fill a reel.
JAFTMA standard diameter
JAFS-D1051100 standard diameter for nylon, fluorocarbon, and polyester, in Japanese gou. Strength is left to each maker. The full table is in the PDF.
| Gou | Standard mm |
|---|---|
| 0.6 | 0.128 |
| 0.8 | 0.148 |
| 1 | 0.165 |
| 1.2 | 0.185 |
| 1.5 | 0.205 |
| 1.75 | 0.220 |
| 2 | 0.235 |
| 2.5 | 0.260 |
| 3 | 0.285 |
| 4 | 0.330 |
| 5 | 0.370 |
| 6 | 0.405 |
| 8 | 0.470 |
Sources: JAFTMA nylon, fluoro, and polyester diameters · JAFTMA PE size in denier
Lithvox line and leaders