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Langelier Saturation Index Online Calculator

Langelier saturation index (LSI) is the value obtained by subtracting the saturated pH (pHs) from the measured pH of the water sample. The calcium carbonate present in the water is used to determine whether scale will separate out from the water, helping you to predict the structure or corrosion tendencies of your water and allowing you to intervene in advance.

Please fill in:
pH:
TDS:
mg/L
Temperature:
°C
  • °C
  • °F
Ca2+:
mg Ca2+/L
  • mg Ca2+/L
  • mg CaCO3/L
Total alkalinity(HCO3-):
mg CaCO3/L
Result:
pHs:
LSI:
Trends: 1

Please note that the LSI is not a reliable method of evaluating corrosion or scaling potential and is only intended to be used as an evaluation guide.