pH Calculator

Calculate pH from acid/base concentration, mass and volume, or ion values ([H+], [OH-], pOH).

This calculator supports multiple pH workflows: concentration of an acid or base, mass plus volume with substance selection, and direct ion-based inputs.

It reports pH and [H+] and also gives related values like pOH and [OH-]. For weak acids/bases, it uses Ka/Kb-based equilibrium approximation.