Conductivity and Resistivity Converter

Choose source and destination units; results update as you type. Conductivity and resistivity units can be selected in either direction. Negative values are not supported.

Enter a valid number. Use a non-negative conductivity or a strictly positive resistivity. 0; 10⁻¹⁸ ≤ x ≤ 10¹⁸

Temperature compensation estimate

Enter a valid number. −50 ≤ T, Tref ≤ 150 °C; 0 ≤ α ≤ 10%/°C; 1 + (α/100)(T − Tref) > 0

This optional linear approximation uses the conductivity above: σref = σT / [1 + α(T − Tref)], with α expressed per °C. The coefficient is solution-specific; 2%/°C is only an editable example. Use a validated coefficient over a limited temperature range. This is not nonlinear or ultrapure-water compensation and does not change the main results.

EC and estimated TDS

Enter a valid number. 0 ≤ x ≤ 10²⁴; 0 < f ≤ 10

TDS (mg/L) ≈ factor × EC (µS/cm). Factors 0.5 and 0.7 are common conventions, not universal constants. Composition changes the relationship. EC → TDS uses the main conductivity without the optional temperature correction; the reverse calculation is independent. Neither EC nor estimated TDS establishes drinking-water safety.

Batch conversion

Enter one value per line or separate values with semicolons, up to 100 values. A decimal point or comma is accepted; do not use thousands separators. The units above apply to every row.

Enter one value per line or separate values with semicolons, up to 100 values. A decimal point or comma is accepted; do not use thousands separators. The units above apply to every row.

Zero conductivity has no finite reciprocal. ∞ represents the ideal limiting resistivity, not a measured value.