Conductance is the flip side of resistance — where resistance says how hard a material fights current, conductance says how easily it lets current through — and its unit is the siemens (S). Older texts call the same unit the mho (℧), which is literally "ohm" spelled backwards, a wink from electrical history that still appears on vintage equipment labels. Type 0.005 into the Siemens (S) box and the readouts show 0.005 Mho (℧) — identical, by definition — plus 5,000 Microsiemens (µS) and 5 Millisiemens (mS). The prefixes do the heavy lifting: micro means ×1,000,000 and milli means ×1,000. Aquarium keepers, pool owners, and hydroponic growers live in microsiemens because water-quality meters report total dissolved solids via conductivity readings in the hundreds of µS. A reading of 500 µS is just 0.0005 S — same physics, friendlier number. Whether the datasheet says siemens, mhos, or microsiemens, this page keeps the decimal point in the right place.

With the pre-filled defaults — Siemens (S) 1 — the Electric Conductance Converter returns Mho (℧) 1.0000, Microsiemens (µS) 1,000,000.0, Millisiemens (mS) 1,000.00. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.