How wire size is estimated
The calculator compares the design current with a simplified copper ampacity table and selects the first listed conductor that meets or exceeds the required current.
Design current = Load current × Continuous-load factor
Electrical safety
This is a planning estimate only. Final conductor size must follow applicable electrical codes, equipment ratings, conductor temperature ratings, voltage-drop limits and qualified professional guidance.
Frequently asked questions
Does larger AWG number mean larger wire?
No. For standard AWG sizes, a smaller gauge number generally means a larger conductor.
Is ampacity the only factor in wire sizing?
No. Voltage drop, temperature, insulation, bundling and code requirements can all affect conductor size.
Should I use this result for final installation?
No. Treat it as an estimate and verify the design against applicable electrical requirements.