Engineering

The wire gauge calculator computes results instantly by applying standard engineering formulas to the values entered into its input fields. No sign-up is required; results appear immediately as you type.

This wire gauge calculator uses standard engineering formulas that are taught in university-level courses and applied in professional practice. All formulas adhere to IEEE, NEMA, or other applicable industry standards.

This calculator provides accurate results based on standard formulas, making it suitable for professional engineering work when verified against project specifications and applicable codes. Licensed engineers should also apply appropriate safety factors.

This wire gauge calculator is completely free to use, with no sign-up required, and can be used as many times as needed. Results are calculated instantly in your browser, and your data is never stored or shared.

Wire gauge is a standardized way to specify a wire’s diameter and, by extension, its cross-sectional area. In systems like AWG, a smaller gauge number means a larger diameter and typically lower electrical resistance. Gauge selection affects current capacity, voltage drop, and heating.

Accuracy depends on the inputs and the assumptions used (material resistivity, temperature, installation conditions, and allowable voltage drop). Results are typically reliable for preliminary sizing when inputs match real-world conditions, but they are not a substitute for code-compliant ampacity tables and derating factors. Always verify against applicable standards (e.g., NEC/IEC) and manufacturer data for final designs.

AWG is a logarithmic gauge system primarily used in North America, while mm² expresses the conductor’s cross-sectional area directly in metric units. Two wires can be compared by converting AWG to an equivalent area in mm², but “equivalent” may vary slightly by standard tables and rounding. Ampacity and voltage drop depend on area, material, insulation, and installation—not the naming system alone.

Yes, it can help estimate conductor size based on current and allowable voltage drop for PV strings, combiner-to-inverter runs, or battery connections. Use the highest expected continuous current and the actual one-way or round-trip length as required by the calculator’s input definition. Confirm the final selection with PV-specific requirements such as continuous-current multipliers, temperature correction, and conduit/roof derating per your local electrical code.