Electric Conductivity Converter
ScienceConvert electric conductivity between siemens per metre, millisiemens per centimetre, and microsiemens per centimetre — used for water quality testing.
From
To
All conversionsfor 1 Millisiemens per Centimetre (mS/cm)
| Siemens per Metre (S/m) | 0.1 |
| Siemens per Centimetre (S/cm) | 0.001 |
| Millisiemens per Centimetre (mS/cm) | 1 |
| Microsiemens per Centimetre (µS/cm) | 1000 |
What is a Electric Conductivity?
The Electric Conductivity Converter converts electric conductivity between siemens per metre (SI base unit), siemens per centimetre, and the water-quality-industry-standard millisiemens and microsiemens per centimetre. Conductivity is an intrinsic material or solution property measuring how easily current flows through it — most commonly encountered in water quality testing, where it serves as a proxy for dissolved mineral and salt content.
Enter a value in any supported unit and the converter calculates the equivalent instantly. For the reciprocal quantity, see the Electric Resistivity Converter.
How to use this Electric Conductivity calculator
- Choose your starting unit from the source dropdown — for example, "Millisiemens per Centimetre (mS/cm)".
- Enter the numeric value you want to convert in the input field.
- Choose your target unit from the destination dropdown — for example, "Siemens per Metre (S/m)".
- Read the converted result, which updates instantly as you type or change units.
- Use the swap (⇅) button if you need to reverse the conversion direction.
- Use the copy button to grab the result for a water quality report or scientific calculation.
Formula & Methodology
The converter's base unit is siemens per metre (S/m). Every supported unit has a fixed multiplier: - 1 siemens per centimetre (S/cm) = 100 S/m - 1 millisiemens per centimetre (mS/cm) = 0.1 S/m - 1 microsiemens per centimetre (µS/cm) = 0.0001 S/m Any conversion follows: Result = Input × (toBase of source unit ÷ toBase of target unit) Worked example — converting seawater's typical conductivity of 50 mS/cm to S/m: Result = 50 × 0.1 = 5 S/m This confirms how the water-quality-industry scale relates to the SI base unit for a highly conductive saline sample.
Frequently Asked Questions
Electric conductivity is an intrinsic material property measuring how easily a material or solution conducts electric current, independent of its specific shape or size — expressed in siemens per metre for general materials, or the more practical millisiemens/microsiemens per centimetre for water quality testing.
Multiply the mS/cm value by 0.1, since one millisiemens per centimetre equals 0.1 siemens per metre. Enter your value with 'Millisiemens per Centimetre (mS/cm)' as the source and 'Siemens per Metre (S/m)' as the target to apply this automatically.
Water conductivity sensors and probes are conventionally calibrated and reported in mS/cm (or µS/cm for very pure water) because this scale produces conveniently-sized numbers for typical water samples, from ultra-pure water (near 0 µS/cm) to seawater (around 50 mS/cm).
Water conductivity correlates with the concentration of dissolved ions (salts, minerals) in the water — higher conductivity generally indicates more dissolved solids, making it a quick, widely used proxy measurement for water purity, salinity, and mineral content, though it doesn't identify which specific ions are present.
Conductivity is the mathematical reciprocal of resistivity (conductivity = 1 ÷ resistivity) — a material with high conductivity has low resistivity, and vice versa. See the [Electric Resistivity Converter](/electric-resistivity-converter/) for that inversely related quantity.
Drinking water typically ranges from about 50 to 800 µS/cm, while seawater is dramatically higher at roughly 50,000 µS/cm (50 mS/cm), reflecting its much higher dissolved salt content — this wide range is why water testing equipment often needs to cover both µS/cm and mS/cm scales.
A conductivity meter applies a small voltage between two electrodes immersed in the water sample and measures the resulting current, calculating conductivity from the known electrode geometry — this is the standard method used in water quality, aquarium, hydroponics, and environmental testing.
Yes — conductivity increases with temperature for most solutions, which is why quality conductivity meters apply temperature compensation to standardise readings to a reference temperature (commonly 25°C) for consistent comparison across measurements taken at different times.
TDS is often estimated from conductivity using an approximate conversion factor (commonly around 0.5 to 0.7, varying by the specific ions present), making conductivity measurement a practical proxy for TDS estimation in water quality monitoring, though it's not a direct, universal conversion.
Water treatment and municipal utilities, environmental monitoring, aquaculture and hydroponics, and materials science (characterising conductive materials and solutions) all routinely work with conductivity data, often needing conversion between the SI base unit and the practical water-quality scale units.
Also known as