To use the Langelier Index calculator, simply enter values for pH, Temperature (in °C), TDS (mg/L), Ca, and Alkalinity (as CaCO3) in the boxes below and then click on the “Calculate Now” button. SIcalcite corresponds to the traditional Langelier Index value.

Sample ID:
Temperature (°C):
pH:
TDS (mg/L):
Ca (mg/L):
as Ca2+

as CaCO3
Alkalinity (mg/L as CaCO3):

Results


SIcalcite: SIaragonite: SIvaterite: SIavg:
Ionic Strength:
Activity Coef
eps:
pfm:
pHCO3:
pK2:
pKs: pKsa: pKsv: pKsavg:
pCa:
pHs: