Things You'll Need

Instructions

1

Strip the insulation from around the wire using wire strippers if it is not already bare. The gauge of a wire is measured by the diameter of the conductor cable, not including the insulation.
2

Determine the diameter by wrapping the tape around the conductor wire. Record the measurement in millimeters.
3

Compare your measurement with a wire gauge sizing chart, such as the one found in the Resource section, to find the wire's gauge. For example, if your measurement is 1 mm, you have a 16-gauge wire.