This tool will calculate the resistance and ampacity for copper wire based on the gauge. Both metric (mm) and American Wire Gauge (AWG) are supported. Note: Ampacity is based on a curve fit to MIL-STD-975.

Wire Size:
Optional Inputs:
Wire Temperature:
Wire Length:
Number of Wires in Bundle:
Results (per each wire)
Resistance: Ohms
Single Wire Ampacity: Amps
Wire Bundle Ampacity (per wire): Amps
Copper Diameter:
Copper Area:
Copper Weight:
Enter the values ​​and the fields will be updated in real time!