Wire Size Calculator
Estimate wire size from current, voltage, length, material, and allowable voltage drop. Returns approximate mm² and AWG recommendations.
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Calculated Minimum 2.92 mm²
Recommended Standard Size 4 mm²
Approx AWG 11 AWG
Frequently Asked Questions
- A simplified wire size calculator estimates the conductor area needed from current, voltage, run length, material, and allowable voltage drop.
- Wire size often refers to a single conductor, while cable size may describe a complete cable assembly. In practice, both calculators often use similar electrical sizing logic.
- AWG is an American wire gauge numbering system, while mm² measures the actual conductor cross-sectional area directly.
- Yes. Longer runs increase resistance and voltage drop, which usually requires a larger wire size.
- Yes, it can help with planning, especially for DC circuits, but you should still verify ampacity, insulation rating, and code or manufacturer guidance.
- Voltage drop is the loss of voltage along the wire due to resistance. Too much drop can reduce performance and create extra heat.
- Copper generally requires less cross-sectional area than aluminum for the same conditions because it has lower resistivity.
- No. It is a planning calculator only and does not replace code compliance, ampacity tables, temperature correction, conduit fill limits, or professional review.