What is a Milliohm? The units of measure for resistances less than 1 Ohm are Milli- and Micro-Ohms. One milliohm (1m\u03a9) is equal to one thousandth of an ohm (0.001 \u03a9). One microohm (1ยต\u03a9) is equal to one millionth of an ohm (0.000001 \u03a9).