The International System of Units is best known for its measures of length, weight and volume, but it also specifies units of measure for such things as the force of electrical movement and electrical conductance and admittance. These two qualities are measured respectively in volts (V) and siemens (S). Milli refers to one one-thousandth of an item, while micro refers to one one-millionth.

Determine the volts and siemens of a particular item or current. Volts and siemens are converted in a 1-to-1 ratio, meaning that 1 volt equals 1 siemens.

Convert millivolts to millisiemens. Since volts and siemens convert on a 1-to-1 ratio, the number of millivolts is equal to the number of millisiemens. Both units are 1/1,000th of the base unit.

i.e.: 1 siemens = 1,000 millisiemens

Convert millisiemens to microsiemens. Milli refers to a unit that is 1/1,000th of its base while micro refers to a unit that is 1/1,000,000th of its base. For conversion, move the decimal point three spaces to the right.

i.e.: 1,000 millisiemens = 1,000,000 microsiemens. 4,500 millisiemens = 4,500,000 microsiemens. 4287.967 millisiemens = 4287967 microsiemens.