Buffer pH Calculator

Use pKa and the conjugate-base to weak-acid ratio for an ideal-solution estimate, with limitations stated clearly.

pKa

Conjugate base amount or concentration

Weak acid amount or concentration

pH 4.76Henderson–Hasselbalch ideal-solution estimate: pH = pKa + log10(base/acid).

How to use this Buffer pH Calculator

Estimate buffer pH with the Henderson–Hasselbalch relationship. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.