AWG 25 Wire
Diameter 0.0179″
Millimeters 0.455 mm
Cross-section 320 cmil
mm² 0.1624
Nominal bare-conductor dimensions per ASTM B258. AWG is geometric: d = 0.005 × 92(36−n)/39 in with n = 25; area is derived from the diameter. Ampacity depends on insulation, bundling, and the electrical code in force — it is a property of the installation, not the gauge.
Neighboring gauges
| AWG | Diameter | mm | vs AWG 25 |
|---|---|---|---|
| 23 | 0.0226″ | 0.574 | +0.0047″ |
| 24 | 0.0201″ | 0.511 | +0.0022″ |
| 25 | 0.0179″ | 0.455 | — |
| 26 | 0.0159″ | 0.404 | −0.0020″ |
| 27 | 0.0142″ | 0.361 | −0.0037″ |
Measuring sheet metal, not wire? Sheet uses a different gauge scale — see 25 gauge sheet (steel: 0.0209″).