Conversion method
Conductivity is the reciprocal of resistivity at the same conditions. It is not conductance of a particular object.
mS/cm = x × 10
10 S/m = 100 mS/cm.
| S/m | mS/cm |
|---|---|
| 1 | 10 |
| 5 | 50 |
| 10 | 100 |
| 25 | 250 |
| 50 | 500 |
| 100 | 1000 |
Unit definitions and sources
Conductivity is the reciprocal of resistivity at the same conditions. It is not conductance of a particular object.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Siemens per meter (S/m); si | Common units | Siemens per meter: base (s-m) = value × 1. Common use: Electrical Conductivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millisiemens per centimeter (mS/cm); si | Common units | Millisiemens per centimeter: base (s-m) = value × 0.1. Common use: Electrical Conductivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Microsiemens per centimeter (µS/cm); si | Specialist units | Microsiemens per centimeter: base (s-m) = value × 0.0001. Common use: Electrical Conductivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Siemens per centimeter (S/cm); si | Specialist units | Siemens per centimeter: base (s-m) = value × 100. Common use: Electrical Conductivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Picosiemens/meter (pS/(m)); other | Specialist units | picosiemens/meter = 1e-12 s-m, derived from the component SI/customary definitions. Common use: Electrical Conductivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of electrical conductivity conversions
All 5 electrical conductivity units convert through Siemens per meter (S/m). 5 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.