Millisiemens per Metre to Siemens per Metre (mS/m to S/m)
1 millisiemens per metre (mS/m) = 0.001 siemens per metre (S/m). 1 S/m = 1000 mS/m. Example: 15 mS/m = 15 × 0.001 = 0.015 S/m.
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1 mS/m = 0.001 S/m
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millisiemens per metre to siemens per metre converter to paste a column from Excel.
How to Convert Millisiemens per Metre to Siemens per Metre
- 1 mS/m = 0.001 S/m
- 1 S/m = 1000 mS/m
- Example: convert 15 mS/m to S/m: 15 mS/m = 15 × 0.001 S/m = 0.015 S/m
Formula
S/m = mS/m ÷ 1000
Derivation from SI units:
- 1 mS/m = 10⁻³ S/m = 10 µS/cm
- The SI unit of electrical conductivity σ = 1/ρ
Both units are defined exactly, so the factor is exact. Millisiemens per Metre definition: millisiemens per metre; Siemens per Metre definition: siemens per metre.
Worked examples
- A reading of 10 mS/m converts to 0.01 S/m.
10 mS/m × 0.001 = 0.01 S/m - A value of 100 mS/m is 0.1 S/m.
100 mS/m × 0.001 = 0.1 S/m
Millisiemens per Metre to Siemens per Metre conversion table
| Millisiemens per Metre (mS/m) | Siemens per Metre (S/m) |
|---|---|
| 0.1 mS/m | 0.0001 S/m |
| 1 mS/m | 0.001 S/m |
| 5 mS/m | 0.005 S/m |
| 10 mS/m | 0.01 S/m |
| 20 mS/m | 0.02 S/m |
| 50 mS/m | 0.05 S/m |
| 100 mS/m | 0.1 S/m |
| 200 mS/m | 0.2 S/m |
| 500 mS/m | 0.5 S/m |
| 1000 mS/m | 1 S/m |
Where it's used
Millisiemens per Metre are used for drinking-water regulations (for example in the EU), while siemens per metre appear in conductor and alloy properties. Both measure electrical conductivity, so the conversion is a fixed factor.
Millisiemens per Metre to other electrical conductivity units
| Conversion | 1 mS/m equals |
|---|---|
| millisiemens per metre to siemens per metre | 0.001 S/m |
| millisiemens per metre to percent IACS | 1.724137931 × 10⁻⁹ %IACS |
| millisiemens per metre to millisiemens per centimetre | 0.01 mS/cm |
| millisiemens per metre to microsiemens per centimetre | 10 µS/cm |
| millisiemens per metre to megasiemens per metre | 1 × 10⁻⁹ MS/m |
| millisiemens per metre to decisiemens per metre | 0.01 dS/m |
| millisiemens per metre to siemens per centimetre | 0.00001 S/cm |
Frequently asked questions
How many siemens per metre are in 1 millisiemens per metre?
1 mS/m = 0.001 S/m.
How do I convert millisiemens per metre to siemens per metre?
Multiply the value in mS/m by 0.001, or divide it by 1000. For example, 15 mS/m × 0.001 = 0.015 S/m.
Is the mS/m to S/m conversion exact?
Yes. Both units are defined exactly, and 1 mS/m is exactly 0.001 S/m.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Millisiemens per Metre to Siemens per Metre (mS/m to S/m). Retrieved October 25, 2026, from https://scientificconverters.com/electrical-conductivity/millisiemens-per-meter-to-siemens-per-meter/
IEEE
Scientific Converters, "Millisiemens per Metre to Siemens per Metre (mS/m to S/m)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/electrical-conductivity/millisiemens-per-meter-to-siemens-per-meter/