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TDS ↔ Conductivity Converter

Convert between total dissolved solids (TDS, mg/L) and electrical conductivity (EC, µS/cm) using the linear correlation TDS = k × EC. Pick the correlation factor for your water type, or use the default 0.65.

Convert

Result

Approx. salinity (g/L)
TDS (mg/L) = k × EC (µS/cm). Typical k: 0.55 for NaCl-dominated water, ~0.65 for mixed natural waters, 0.7–0.8 for sulfate-rich or hard waters. The factor is empirical — measure a sample to calibrate k for accurate work. Salinity (g/L) ≈ TDS ÷ 1000.