electric conductivity converter
Instantly convert electrical conductivity between S/m, mS/cm, and µS/cm. Analyze liquid testing TDS values and calculate IACS metallurgy standards in real-time.
Unit ConvertersLiquid Testing & TDS
Conductivity changes by ~2% per °C from 25°C
How to Use the Electric Conductivity Converter
Step-by-step guide to measuring conductivity, calculating TDS, adjusting temperature, and checking metallurgy standards.
Enter Conductivity in Any Unit
Type a value into any input box: Siemens/meter (S/m), Millisiemens/cm (mS/cm), or Microsiemens/cm (µS/cm).
Automatic Unit Synchronization
All complementary units convert automatically in real time using exact physical relationships (1 S/m = 10 mS/cm = 10,000 µS/cm).
Evaluate Water TDS & Purity
Examine the dynamic TDS calculation in parts per million (ppm) and the visual water quality purity spectrum gauge.
Select TDS Conversion Factor
Choose between standard 0.5 (NaCl benchmark) and 0.7 (442 natural fresh water solution) based on your water source.
Adjust Thermal Compensation
Slide the temperature control (0°C to 100°C) to simulate temperature dependency normalized at the 25°C industry standard.
Check % IACS & Copy Test Results
Toggle the IACS metallurgy standard to compare copper purity, or click Copy Test Results to export a formatted summary.
Frequently Asked Questions
Everything you need to know about electrical conductivity, TDS calculations, thermal compensation, and IACS.
Q:What is electrical conductivity and how does it differ from conductance?
Electrical conductivity (σ or κ) is an intrinsic intensive material property measuring how easily a substance conducts electric current, expressed in S/m or µS/cm. In contrast, electrical conductance (G) is an extensive property that depends on the physical geometry (length and cross-sectional area) of the sample, measured in Siemens (S). They are related by G = σ · A / L.
Q:How do you convert between S/m, mS/cm, and µS/cm?
1 S/m equals 10 mS/cm or 10,000 µS/cm. Conversely, 1 mS/cm equals 0.1 S/m or 1,000 µS/cm, and 1 µS/cm equals 0.001 mS/cm or 0.0001 S/m. To convert µS/cm to S/m, divide by 10,000; to convert S/m to µS/cm, multiply by 10,000.
Q:How is conductivity converted into Total Dissolved Solids (TDS in ppm)?
TDS is estimated from electrical conductivity using the formula: TDS (ppm or mg/L) = Conductivity (µS/cm) × Factor. The conversion factor typically ranges between 0.5 (for pure sodium chloride NaCl solutions) and 0.7 (for the 442 natural water standard containing 40% sodium sulfate, 40% sodium bicarbonate, and 20% sodium chloride).
Q:Why does liquid temperature affect electrical conductivity so significantly?
In aqueous solutions, higher temperatures lower the viscosity of water, enabling dissolved ions to move more rapidly and increasing electrical conductivity by approximately 1.9% to 2.0% per degree Celsius. Standard laboratory and meter measurements normalize readings to a reference temperature of 25°C using automatic temperature compensation (ATC).
Q:What does % IACS mean in electrical engineering and metallurgy?
IACS stands for International Annealed Copper Standard. Established in 1913, 100% IACS corresponds to a conductivity of 5.80 × 10⁷ S/m (58 MS/m) at 20°C for commercially pure annealed copper. Materials with higher conductivity, such as pure silver, reach ~105-108% IACS, while electrical-grade aluminum reaches ~61% IACS.
Q:What are typical conductivity values for different types of water?
Ultra-pure / deionized water measures 0.055 to 0.1 µS/cm; distilled or RO water typically ranges from 0.5 to 5 µS/cm; municipal tap water ranges from 100 to 800 µS/cm; mineral water ranges from 500 to 1,500 µS/cm; brackish water measures 1,000 to 10,000 µS/cm; and ocean seawater reaches 45,000 to 55,000 µS/cm (45-55 mS/cm).
Q:What is the relationship between electrical conductivity and electrical resistivity?
Conductivity (σ) and resistivity (ρ) are exact mathematical reciprocals: ρ = 1 / σ. For liquid purity, ultra-pure water with a theoretical conductivity of 0.055 µS/cm corresponds to a maximum electrical resistivity of 18.2 MΩ·cm (Megaohm-centimeters) at 25°C.
- σ (Sigma): Electrical Conductivity (S/m).
- ρ (Rho): Electrical Resistivity (Ω·m).
- L: Length of the conductor.
- R: Electrical Resistance (Ω).
- A: Cross-sectional Area.
Electric conductivity converter Table
| Unit | S/m | S/cm | mS/m | mS/cm |
|---|---|---|---|---|
| 1 S/m | 1 | 0.01 | 1,000 | 10 |
| 1 S/cm | 100 | 1 | 100,000 | 1,000 |
| 1 mS/m | 0.001 | 0.00001 | 1 | 0.01 |
| 1 mS/cm | 0.1 | 0.001 | 100 | 1 |
What is electric conductivity converter?
| Interface Element | Scientific Function | Practical Application |
|---|---|---|
| IACS Metallurgy Standard | Material Benchmarking | Toggles the engine to compare the electrical conductivity of metals against the International Annealed Copper Standard. |
| Liquid Testing & TDS | Solute Estimation | Converts raw electrical conductivity into Total Dissolved Solids (ppm) to evaluate water purity. |
| Conversion Factor | Chemical Calibration | Adjusts the mathematical ratio (e.g., 0.5 for NaCl) depending on the dominant salts in the liquid. |
| Thermal Compensation | Temperature Correction | Adjusts conductivity readings by approximately 2% per °C to normalize measurements to 25°C. |