Wire Size Calculator
Select Voltage
120V 208V 240V 277V 480V
Select Wire Type
  Copper Aluminum
Select Phase
  Single Phase Three Phase
Input Amperage Input One Way Distance (in feet)
Minimum Size Required
This Calculator will determine the minimum size conductor needed based on a 3% Voltage Drop. It does not take into consideration other factors such as minimum ampacity based on the National Electrical Code Table 310-16. (Allowable ampacities of conductors). Consult The NEC for further details.

Disclaimer: The information included on this table and the results of any calculations are not guaranteed to be correct and as such are not meant to replace consultation with the appropriate authorities.  Atkins & Stang Inc. does not assume responsibility for any false or misleading information associated with the links provided on this page.