Electrical Wire Size Calculator

This should be used as a reference only. Please check with your electrical inspector or a licensed electrician for the proper wire size. There are many factors to consider before choosing the proper gauge.

Please don’t use this calculator for short service runs. 

Wire Size
Required Data Entry
Wire Type	Copper Aluminum
Circuit Phase	Single Phase Three Phase
Circuit Voltage	120 208 240 277 480
One Half The Total Circuit Length
Total Circuit Amperage
Calculated Results
Required Minimum Wire Size