KCMIL is a quantity of measure units; KCMIL is 1000 CMILS. All wire sizes larger than 4 ought AWG are given as KCMIL sizes. KCMIL wire size is the equivalent cross sectional area in thousands of circular mils. A circular MIL (CMIL) is the area of a circle with a diameter of one thousandth (0.001) of an inch, often termed CMA. Be aware that the wire sizes in the KCMIL system increase as the numbers get larger, which is exactly opposite from the AWG system.