Electrical Conductance Converter — Siemens & Mho

Convert between siemens, millisiemens, microsiemens, kilosiemens, and mho.

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How this conversion works. Every unit is converted through the siemens (Ω⁻¹); the mho is an exact synonym per NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Kilosiemens (kS) or Siemens (S).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Statmho (stat℧) included.

Frequently asked questions

How do I convert microsiemens to millisiemens?

1 microsiemens = 0.001 millisiemens. Choose "Microsiemens (µS)" as From and "Millisiemens (mS)" as To, type a value, and the result updates instantly.

Is a mho the same as a siemens?

Yes — mho ("ohm" backwards) is the pre-SI name. 1 ℧ = 1 S exactly. Older US schematics and tube datasheets still show µmhos.

What does µS/cm mean on a water meter?

That is conductivity (conductance × cell geometry), not plain conductance. Drinking water runs 50–800 µS/cm; deionized water is below 1 µS/cm. Convert the numeric prefix here; the /cm stays.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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