英国和美国使用线号标记法。线号又称线规(wire gauge),按0、1、2、3……数码顺序表示,数码越大,线材越细。现今常使用的是美国线规(AWG),伯明翰线规(BWG)和英帝国标准线规(SWG)。
| Calibre | SWG | B&S / AWG | ||
| inch | mm | inch | mm | |
| 7/0 | 0.5 | 12.7 | – | – |
| 6/0 | 0.464 | 11.79 | 0.58 | 14.73 |
| 5/0 | 0.432 | 10.97 | 0.5165 | 13.12 |
| 4/0 | 0.4 | 10.16 | 0.46 | 11.68 |
| 3/0 | 0.372 | 9.45 | 0.4095 | 10.4 |
| 2/0 | 0.348 | 8.84 | 0.365 | 9.27 |
| 0 | 0.324 | 8.23 | 0.325 | 8.26 |
| 1 | 0.3 | 7.62 | 0.2895 | 7.35 |
| 2 | 0.276 | 7.01 | 0.2575 | 6.54 |
| 3 | 0.252 | 6.4 | 0.2295 | 5.83 |
| 4 | 0.232 | 5.89 | 0.204 | 5.18 |
| 5 | 0.212 | 5.39 | 0.182 | 4.62 |
| 6 | 0.192 | 4.88 | 0.162 | 4.11 |
| 7 | 0.176 | 4.47 | 0.144 | 3.66 |
| 8 | 0.16 | 4.06 | 0.1285 | 3.26 |
| 9 | 0.144 | 3.66 | 0.114 | 2.9 |
| 10 | 0.128 | 3.25 | 0.102 | 2.59 |
| 11 | 0.116 | 2.95 | 0.091 | 2.31 |
| 12 | 0.104 | 2.64 | 0.0808 | 2.05 |
| 13 | 0.092 | 2.34 | 0.072 | 1.83 |
| 14 | 0.08 | 2.03 | 0.0642 | 1.63 |
| 15 | 0.072 | 1.83 | 0.0571 | 1.45 |
| 16 | 0.064 | 1.63 | 0.0508 | 1.29 |
| 17 | 0.056 | 1.42 | 0.0453 | 1.15 |
| 18 | 0.048 | 1.22 | 0.0403 | 1.02 |
| 19 | 0.04 | 1.02 | 0.036 | 0.914 |
| 20 | 0.036 | 0.914 | 0.032 | 0.813 |
| 21 | 0.032 | 0.813 | 0.0285 | 0.724 |
| 22 | 0.028 | 0.711 | 0.0253 | 0.643 |
| 23 | 0.024 | 0.61 | 0.0226 | 0.0574 |
| 24 | 0.022 | 0.559 | 0.02 | 0.508 |
| 25 | 0.02 | 0.508 | 0.018 | 0.457 |
| 26 | 0.018 | 0.457 | 0.01595 | 0.405 |
| 27 | 0.0164 | 0.417 | 0.0142 | 0.361 |
| 28 | 0.0148 | 0.376 | 0.01265 | 0.321 |
| 29 | 0.0136 | 0.345 | 0.0113 | 0.287 |
| 30 | 0.0124 | 0.312 | 0.01 | 0.254 |
| 31 | 0.0116 | 0.295 | 0.00895 | 0.227 |
| 32 | 0.0108 | 0.274 | 0.00795 | 0.202 |
| 33 | 0.01 | 0.254 | 0.0071 | 0.18 |
| 34 | 0.0092 | 0.234 | 0.0063 | 0.16 |
| 35 | 0.0084 | 0.213 | 0.0056 | 0.142 |
| 36 | 0.0076 | 0.193 | 0.005 | 0.127 |
| 37 | 0.0068 | 0.173 | 0.00445 | 0.113 |
| 38 | 0.006 | 0.152 | 0.00395 | 0.1 |
| 39 | 0.0052 | 0.132 | 0.00353 | 0.09 |
| 40 | 0.0048 | 0.122 | 0.00315 | 0.08 |
| 41 | 0.0044 | 0.112 | 0.0028 | 0.071 |
| 42 | 0.004 | 0.102 | 0.0025 | 0.064 |
| 43 | 0.0036 | 0.091 | 0.0022 | 0.056 |
| 44 | 0.0032 | 0.081 | 0.002 | 0.051 |
| 45 | 0.0028 | 0.071 | 0.0018 | 0.046 |
| 46 | 0.0024 | 0.061 | 0.0016 | 0.041 |
| 47 | 0.002 | 0.051 | 0.0014 | 0.036 |
| 48 | 0.0016 | 0.041 | 0.0012 | 0.03 |
| 49 | 0.0012 | 0.031 | 0.0011 | 0.028 |
| 50 | 0.001 | 0.025 | – | – |
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