AquaVerify

Hardness and alkalinity calculator

Calculate hardness from Ca and Mg, CaCO3 equivalents or alkalinity from titration.

Hardness and alkalinity calculator

Formula

Hardness as CaCO3 = Ca x 2.497 + Mg x 4.118

Variables and units

  • Ca mg/L
  • Mg mg/L
  • meq/L
  • mL sample
  • N acid
  • mg/L as CaCO3

Worked example

Example: Ca 40 mg/L and Mg 12 mg/L gives 149.296 mg/L as CaCO3.

149.296 mg/L as CaCO3.

How to read the result

Reports as mg/L as CaCO3 without regulatory classification.

Validation rules

Inputs must be finite, compatible and within calculation limits. Denominators cannot be zero.

Warnings

This calculator is an educational and workflow aid. It does not replace a validated method, SOP, accreditation decision or regulatory interpretation.

Private by design

Inputs and results stay in your browser. AquaTools Free does not send calculation values to AquaVerify servers.

Sources

Related calculators

Industries

Glossary

Resources

AquaVerify Cloud

Move from a one-off calculation to controlled sample, method and report workflows in AquaVerify Cloud.

FAQ

Are my inputs stored?

Inputs and results stay in your browser. AquaTools Free does not send calculation values to AquaVerify servers.

Can I use this as an official method record?

This calculator is an educational and workflow aid. It does not replace a validated method, SOP, accreditation decision or regulatory interpretation.

Where do saved calculations live?

AquaVerify Cloud keeps the governed workflows: saved calculations, history, traceability, ELN, LIMS review, reports and collaboration.