Compare AWG conductor geometry, copper/aluminum resistance at 20°C and an optional equal-outgoing/return DC voltage-drop estimate.
01 / PURPOSE-SPECIFIC INPUTS
AWG only, 0000 (4/0) through40. No certified ampacity, NEC compliance or installation safety is implied; insulation, temperature, installation and codes affect permissible current.
Voltage-drop-only estimates at 20°C, with equal outgoing and return conductors. These are not safe-wire-size, ampacity, NEC/code-compliance or installation recommendations. Temperature, connections and conductor construction can change actual resistance. Positive finite inputs are required; drop limit must be between 0% and 100%, excluding both endpoints. Source voltage supports 10⁻¹²–10¹² V, current up to 10⁹ A, and length up to 10⁹ selected units. Numerically unrepresentable results are rejected.
Voltage-drop-only estimates at 20°C, with equal outgoing and return conductors. These are not safe-wire-size, ampacity, NEC/code-compliance or installation recommendations. Temperature, connections and conductor construction can change actual resistance. Positive finite inputs are required; drop limit must be between 0% and 100%, excluding both endpoints. Source voltage supports 10⁻¹²–10¹² V, current up to 10⁹ A, and length up to 10⁹ selected units. Numerically unrepresentable results are rejected.
02 / RESULT & INTERACTIVE INSPECTION
No certified ampacity, NEC compliance or installation safety is implied. Insulation, temperature, installation conditions, conductor construction and applicable electrical codes affect permissible current.
AWG 10 at 100 m: R = 0.3277 Ω one way. Entered gauge at entered length: 0.3277 Ω; assumed-current outgoing/return drop 6.55407 V.
| AWG label | Index | Diameter mm | Area mm² | Ω/m | One-way Ω at entered length |
|---|---|---|---|---|---|
| 10 | 10 | 2.588187 | 5.261155 | 0.003277 | 0.327704 |
| 20 | 20 | 0.811821 | 0.517619 | 0.033308 | 3.330827 |
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
American Wire Gauge only, from 0000 (4/0) through 40. The equivalent numerical indices for 4/0, 3/0, 2/0 and 1/0 are −3, −2, −1 and 0. British Standard Wire Gauge is not interchangeable.
Compare AWG conductor geometry, copper/aluminum resistance at 20°C and an optional equal-outgoing/return DC voltage-drop estimate. Inspect actual calculated quantities with accessible controls and review the worked unit conversions and assumptions.
Wire Gauge Calculator calculates locally in browser memory. Entered circuit values, grades, temperatures and conductor measurements are not sent to a third-party processing service or stored as a personal profile. Ordinary page requests may still be logged. Clipboard access occurs only after choosing Copy Result.
American Wire Gauge only, from 0000 (4/0) through 40. The equivalent numerical indices for 4/0, 3/0, 2/0 and 1/0 are −3, −2, −1 and 0. British Standard Wire Gauge is not interchangeable.
Diameter in mm is 0.127×92^((36−AWG_index)/39). Area in mm² is π×diameter²/4. The two cross-sections share an actual millimeter scale, so area changes with the square of diameter.
At 20°C, copper resistivity is approximately 1.7241×10⁻⁸ Ω·m and aluminum 2.8264×10⁻⁸ Ω·m. One-way resistance is ρL/A with length in meters and area converted from mm² to m².
The model assumes equal outgoing and return conductors, each with the entered one-way length and resistance. Therefore loop resistance is 2×R_oneway and DC drop is 2×I×R_oneway. A percentage also requires a supplied positive source voltage.
The result is flagged as an inconsistent imposed-current load scenario rather than clipped or presented as a solved circuit. The tool does not solve source impedance or the load’s current-voltage behavior.
No. It provides solid-equivalent geometry and approximate DC resistance, not certified ampacity, NEC compliance or installation safety. Insulation, temperature, contacts, construction, installation conditions and applicable codes affect permissible current and real resistance.