Siemens per Metre to Millisiemens per Metre (S/m to mS/m)
1 siemens per metre (S/m) = 1000 millisiemens per metre (mS/m). 1 mS/m = 0.001 S/m. Example: 15 S/m = 15 × 1000 = 15000 mS/m.
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1 S/m = 1000 mS/m
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk siemens per metre to millisiemens per metre converter to paste a column from Excel.
How to Convert Siemens per Metre to Millisiemens per Metre
- 1 S/m = 1000 mS/m
- 1 mS/m = 0.001 S/m
- Example: convert 15 S/m to mS/m: 15 S/m = 15 × 1000 mS/m = 15000 mS/m
Formula
mS/m = S/m × 1000
Derivation from SI units:
- The SI unit of electrical conductivity σ = 1/ρ
- 1 mS/m = 10⁻³ S/m = 10 µS/cm
Both units are defined exactly, so the factor is exact. Siemens per Metre definition: siemens per metre; Millisiemens per Metre definition: millisiemens per metre.
Worked examples
- A reading of 0.5 S/m converts to 500 mS/m.
0.5 S/m × 1000 = 500 mS/m - A value of 1000000 S/m is 1000000000 mS/m.
1000000 S/m × 1000 = 1000000000 mS/m
Siemens per Metre to Millisiemens per Metre conversion table
| Siemens per Metre (S/m) | Millisiemens per Metre (mS/m) |
|---|---|
| 0.0000055 S/m | 0.0055 mS/m |
| 0.005 S/m | 5 mS/m |
| 0.05 S/m | 50 mS/m |
| 0.5 S/m | 500 mS/m |
| 5 S/m | 5000 mS/m |
| 1000 S/m | 1000000 mS/m |
| 1000000 S/m | 1000000000 mS/m |
| 35000000 S/m | 35000000000 mS/m |
| 58000000 S/m | 58000000000 mS/m |
| 63000000 S/m | 63000000000 mS/m |
Where it's used
Siemens per Metre are used for conductor and alloy properties, while millisiemens per metre appear in drinking-water regulations (for example in the EU). Both measure electrical conductivity, so the conversion is a fixed factor.
Siemens per Metre to other electrical conductivity units
| Conversion | 1 S/m equals |
|---|---|
| siemens per metre to millisiemens per metre | 1000 mS/m |
| siemens per metre to percent IACS | 0.000001724137931 %IACS |
| siemens per metre to millisiemens per centimetre | 10 mS/cm |
| siemens per metre to microsiemens per centimetre | 10000 µS/cm |
| siemens per metre to megasiemens per metre | 0.000001 MS/m |
| siemens per metre to decisiemens per metre | 10 dS/m |
| siemens per metre to siemens per centimetre | 0.01 S/cm |
Frequently asked questions
How many millisiemens per metre are in 1 siemens per metre?
1 S/m = 1000 mS/m.
How do I convert siemens per metre to millisiemens per metre?
Multiply the value in S/m by 1000. For example, 15 S/m × 1000 = 15000 mS/m.
Is the S/m to mS/m conversion exact?
Yes. Both units are defined exactly, and 1 S/m is exactly 1000 mS/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). Siemens per Metre to Millisiemens per Metre (S/m to mS/m). Retrieved October 25, 2026, from https://scientificconverters.com/electrical-conductivity/siemens-per-meter-to-millisiemens-per-meter/
IEEE
Scientific Converters, "Siemens per Metre to Millisiemens per Metre (S/m to mS/m)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/electrical-conductivity/siemens-per-meter-to-millisiemens-per-meter/