Hangar Flying WireSize
Aircraft DC wire sizing
Aircraft electrical design aid
Choose wire size using voltage drop and ampacity.
Enter the circuit requirements below. The calculator selects the smallest listed copper AWG satisfying both device-voltage and 35°C temperature-rise limits.
Wire length definition
One-way wire length is the physical distance from the source or bus to the device. For a two-wire DC circuit, the calculator doubles this value internally to include the power conductor out and return conductor back.
Design aid only. Verify insulation rating, bundling, ambient temperature, terminal ratings, fault-current capability, equipment instructions, and applicable regulatory guidance before installation.