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Langelier Saturation Index Calculator

03 / 08

Calculate LSI from pH, temperature, total dissolved solids, calcium hardness, and total alkalinity using the saturation-pH equation.

FormulaLSI = measured pH − pHs

Enter your values

Calculated result

Result—Enter valid values

A

How the calculation works

Saturation pH is calculated from temperature, total dissolved solids, calcium hardness as CaCO3, and total alkalinity as CaCO3. A result near zero indicates approximate calcium carbonate equilibrium under the assumptions of the model.

B

Limits and responsible use

LSI is an equilibrium tendency indicator, not a direct corrosion-rate measurement. It does not represent every material, disinfectant system, inhibitor, dissolved gas condition, or water treatment objective. Use adjusted alkalinity where the applicable method requires it.

Formula reference

The calculation and interpretation are presented with their assumptions so the result can be independently checked.

View U.S. EPA corrosion and calcium carbonate saturation index reference ↗
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