Conductivity From Specific Conductance Calculator

Example Data Table

Formula Used

Specific conductance is commonly reported as electrical conductivity normalized by geometry. The calculator first converts the selected input unit into siemens per meter.

κ(S/m) = specific conductance × unit conversion factor

When temperature correction is enabled, the calculator estimates conductivity at the reference temperature. A linear correction is used.

κref = κmeasured ÷ [1 + α(Tsample - Tref)]

Here, κ is conductivity, α is the temperature coefficient as a decimal, Tsample is sample temperature, and Tref is reference temperature.

Resistivity = 1 ÷ κ(S/m)

TDS(mg/L) ≈ EC(µS/cm) × TDS factor

Λm = κ(S/m) ÷ concentration(mol/m³)

How to Use This Calculator

1. Enter the specific conductance value from your meter or report.
2. Select the input unit used by your measurement.
3. Choose the output unit you want for conductivity.
4. Enter sample temperature and reference temperature.
5. Use a temperature coefficient that matches your solution.
6. Add a TDS factor when you need a dissolved solids estimate.
7. Add concentration if molar conductivity is required.
8. Press Calculate, or download the result as CSV or PDF.

Understanding Conductivity From Specific Conductance

What the Measurement Means

Conductivity describes how easily a liquid carries electric current. It rises when dissolved ions increase. Specific conductance is often used for the same practical reading, because the meter already accounts for the cell geometry. This makes the value useful for water checks, laboratory solutions, hydroponic feeds, soil extracts, and industrial process streams.

Why Units Matter

Conductivity values may appear in µS/cm, mS/cm, S/cm, or S/m. These units can look similar, yet their sizes are very different. A wrong unit can move the result by hundreds or thousands of times. This calculator converts every input into S/m first. It then converts the final result into the unit you select.

Temperature Correction

Conductivity changes with temperature. Warm liquids usually show higher conductance because ions move faster. Many reports compare readings at 25 °C. A linear coefficient gives a practical correction for common field work. The default coefficient is 2 percent per degree Celsius. Use a known coefficient when your solution has special chemistry.

Extra Outputs

The calculator also gives resistivity, equivalent EC, estimated TDS, and uncertainty. Resistivity is the inverse of conductivity. TDS is only an estimate, because different salts produce different conductivity responses. Molar conductivity needs concentration. It helps compare electrolytes at equal chemical amount. These outputs make the tool useful beyond simple unit conversion.

Good Practice

Rinse the probe before measurement. Avoid bubbles on the cell plates. Let the sample reach a stable temperature. Calibrate the meter with a fresh standard. Record the unit, temperature, coefficient, and reference temperature. These small details make conductivity reports easier to audit and repeat.