How to Choose the Correct Wire Gauge for Your Extension Cord

Picking the correct Wire Gauge for your Extension Cord

Locate the required wattage of the electronic device normally located at the bottom or back. wattage requirements electronic device

Calculating the correct gauge

  1. Calculate the total wattage of all your devices.
  2. Divide by 110 (the standard household voltage )
  3. Round 10.9 down to the nearest whole number

Result is the Gauge.

Total wattage = 1200W / 110 = 10.9
Round down = 10 Gauge.


Most devices will do fine with 12G(gauge) extension cords. Power hungry devices such as lawnmowers, heavy machines, require a lower gauge such as 10G. Keep in mind, the lower the gauge means the thicker the cord.