Electric Conductance Converter

Electric conductance measures how easily current flows through a component or material — the mathematical inverse of resistance. Where resistance describes opposition to current, conductance describes the ease of flow, and the two are always related by conductance = 1 ÷ resistance.

Our Electric Conductance converter supports the SI unit, siemens (S), along with its full metric prefix range from megasiemens down to microsiemens. Ampere/volt is dimensionally identical to siemens, since conductance equals current divided by voltage. The mho — literally "ohm" spelled backward — is the older, pre-1971 name for the siemens, and remains numerically identical to it; gemmho and micromho are older scaled variants still occasionally seen in water quality and soil science references. The CGS abmho and statmho are historical units from two different unit systems, and the quantized Hall conductance (about 3.874 × 10⁻⁵ siemens) is a fundamental physical constant related to the quantum Hall effect.

To use the converter, select your starting and target units from the dropdown lists and enter a value — the result is calculated instantly to up to 12 significant digits. For example, converting a resistance-equivalent conductance of 0.25 siemens (corresponding to 4 ohms of resistance) to millisiemens gives 250 mS, useful when comparing sensor or instrument readings that use different scale conventions.

Conductance conversions are useful in parallel circuit analysis, where total conductance is simply the sum of individual branch conductances (unlike resistances, which require a reciprocal-sum formula) — making conductance the more convenient quantity for certain circuit calculations. Water quality testing measures electrical conductivity (closely related to conductance) to estimate dissolved ion concentration, and semiconductor engineers use transconductance (a related quantity) to characterize transistor amplification behavior.

All conversion factors used in this tool are drawn from standard, internationally recognized unit definitions, so results are dependable for circuit analysis, water quality testing, and physics coursework. The converter is free, requires no account, and works equally well on desktop and mobile devices.