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Conductivity (EC) Calculator

Phreeqc-style

The purpose of this calculator is to determine what conductivity to expect when preparing a nutrient solution [from demineralized water].

Inputs in µeq/ℓ or µmol/ℓ; output in µS/cm. Includes temperature dependence and a toggle to interpret the HCO₃⁻ field either as DIC or free bicarbonate.

Input units:

Cations (µeq/ℓ)

NH₄⁺ H⁺ Na⁺ K⁺ Ca²⁺ Mg²⁺

Anions (µeq/ℓ)

NO₃⁻ H₂PO₄⁻ SO₄²⁻ Cl⁻ CO₃²⁻ HCO₃⁻

Interpretation:

Conditions

pH Temp (°C) Λ⁰ are adjusted for temperature via viscosity ratio scaling.

Result

EC: — µS/cm

Ionic strength I: — mol/ℓ

DIC split:

H₂CO₃*: —
HCO₃⁻: —
CO₃²⁻: —

Cation–anion balance (CBE):

—
—

Note: This is a simplified approximation. PhreeqcI provides more accurate results by calculating detailed speciation and activity coefficients.