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Calculate total alkalinity as CaCO3 from acid titration volume, normality, sample volume, and blank correction.
FormulaAlkalinity (mg/L as CaCO₃) = (A − B) × N × 50,000 ÷ sample mL
Calculated result
Result—Enter valid values
A
How the calculation works
Enter the acid volume used to reach the selected titration endpoint. Subtract any blank correction, then apply the titrant normality and sample volume. The result is reported as milligrams per litre as calcium carbonate, the standard reporting basis for alkalinity.
B
Limits and responsible use
The endpoint and titrant must match the analytical method used by your laboratory. This calculator does not select an endpoint, validate standardization, or correct for interferences.
Formula reference
The calculation and interpretation are presented with their assumptions so the result can be independently checked.
View U.S. EPA methods for chemical analysis of water and wastes ↗