AWG ↔ Metric Cross-Section
Convert between AWG, metric cross-section, conductor diameter, and resistance per kilometre, with a current-density ampacity estimate.
Key points
AWG ↔ Metric Cross-Section: Convert between AWG, metric cross-section, conductor diameter, and resistance per kilometre, with a current-density ampacity estimate. Formula: d = 0.127·92^((36−n)/39) ｜ S = πd²/4 ｜ R = ρ·1000/S. Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. AWG is a US gauge: smaller numbers mean thicker conductors. Below 0, 1/0, 2/0, 3/0, and 4/0 denote progressively thicker sizes. Metric cables are selected by nominal mm²; AWG is for comparison. For stranded conductors, use total cross-section for resistance and ampacity.
Inputs
d = 0.127·92^((36−n)/39) ｜ S = πd²/4 ｜ R = ρ·1000/SCalculation model (updates with parameters)
| AWG gauge | 12 AWG | n = 12 |
| Conductor diameter d | 2.053 mm | 单根实心导体Equivalent直径 |
| Metric cross-section S | 3.309 mm² | 按CircleArea πd²/4 Calculate |
| Copper resistance | 5.289 Ω/km | 20°C，ρ=0.0175 Ω·mm²/m |
| Aluminum resistance | 8.795 Ω/km | 20°C，ρ=0.0291 Ω·mm²/m |
| 参考载流量（铜，J=4.0） | 13.24 A | S×J 估算，未考虑敷设方式、并列根数andAmbient temperature |
| Selected-material resistance per km | 5.289 Ω/km | 用于voltage dropand短路热稳定初算 |
| Resistance per metre | 0.00529 Ω/m | R = ρ/S |
Engineering notes
- AWG is a US gauge: smaller numbers mean thicker conductors. Below 0, 1/0, 2/0, 3/0, and 4/0 denote progressively thicker sizes.
- Metric cables are selected by nominal mm²; AWG is for comparison. For stranded conductors, use total cross-section for resistance and ampacity.
- Ampacity depends strongly on installation, ambient temperature, grouping, and insulation. This tool uses current density; use manufacturer tables for final selection.
FAQ
- What is AWG ↔ Metric Cross-Section for?
- Convert between AWG, metric cross-section, conductor diameter, and resistance per kilometre, with a current-density ampacity estimate.
- What is the formula for AWG ↔ Metric Cross-Section?
- Core formula: d = 0.127·92^((36−n)/39) ｜ S = πd²/4 ｜ R = ρ·1000/S. The tool returns results instantly using this formula and the selected parameters.
- What engineering notes should I keep in mind when using AWG ↔ Metric Cross-Section?
- AWG is a US gauge: smaller numbers mean thicker conductors. Below 0, 1/0, 2/0, 3/0, and 4/0 denote progressively thicker sizes. Metric cables are selected by nominal mm²; AWG is for comparison. For stranded conductors, use total cross-section for resistance and ampacity. Ampacity depends strongly on installation, ambient temperature, grouping, and insulation. This tool uses current density; use manufacturer tables for final selection.