Microsiemens (µS)
The microsiemens (µS) equals 10⁻⁶ siemens — the common unit on water-quality and conductivity (EC) meters.
Microsiemens measure dissolved-ion conductivity in aquariums, hydroponics, boiler water, and environmental monitoring.
Microsiemens to Millisiemens
Convert microsiemens to millisiemens instantly. Type in either field — results update live.
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electric-conductance Microsiemens Millisiemens
1 microsiemens = 0.001 millisiemenss
Unit
Unit
Conversion table
Selected µS values converted to mS using the exact factor from this tool.
| µS | mS |
|---|---|
| 0.01 | 0.00001 |
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 1,000 | 1 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 µS = 0.001 mS
1 mS = 1000 µS
To convert microsiemens to millisiemens, multiply by 0.001.
To convert millisiemens to microsiemens, multiply by 1000.
Example: convert 10 µS to mS
10 × 0.001 = 0.01 mS
About these units
Short background on the units used in this conversion.
Millisiemens (mS)
The millisiemens (mS) equals 0.001 siemens — used for higher-conductivity solutions and industrial process water.
Millisiemens appear when EC readings exceed the microsiemens range, such as seawater and concentrated brines.
Frequently asked questions
How many millisiemenss are in one microsiemens?
One microsiemens equals 0.001 millisiemenss. Multiply your microsiemenss value by 0.001 to convert to millisiemenss.
What is the conversion formula?
mS = µS × 0.001The reverse is
µS = mS × 1,000, using the same exact factors as this converter.Is this Microsiemens to Millisiemens converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.