AWG copper wire: diameter, area and resistance per km, the nearest AWG for an ar...

{ "method": "GET", "queryParams": { "awg": 18, "currentA": 2, "lengthM": 10, "supplyV": 12 }, "type": "http" }

{ "example": { "areaMm2": 0.82305, "asOf": "2026-10-11T08:33:13.563Z", "awg": 18, "basis": "solid annealed copper at 20 C (1.7241e-8 ohm metre)", "copperResistanceOhmPer1000ft": 6.3849, "copperResistanceOhmPerKm": 20.948, "degraded": false, "diameterInch": 0.040303, "diameterMm": 1.0237, "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.", "loopLengthM": 20, "loopResistanceOhm": 0.418956, "notChecked": [ "AMPACITY: this service does NOT say how much current a wire can safely carry. That depends on insulation, bundling, ambient temperature, and local electrical codes: use the code tables or a qualified …", "aluminium or other conductors (copper only)", "…2 more" ], "note": null, "powerLossW": 1.67582, "reasons": [ "Diameter = 0.127 mm x 92^((36 - n) / 39). Lower AWG numbers are thicker wire.", "Voltage drop uses the round-trip length (there and back). A common design target is under 3% drop.", "…1 more" ], "source": "computed locally", "summary": "AWG 18: 1.024 mm (0.0403 in), 0.823 mm2, 20.95 ohm/km. 10 m out and back at 2 A drops 0.8379 V (6.98% of 12 V), wasting 1.68 W.", "verdict": "COMPUTED", "voltageDropPct": 6.983, "voltageDropV": 0.837911 }, "type": "json" }