basic

Henderson-Hasselbalch Buffer pH Calculator

pH = pKa + log([A⁻]/[HA]) — buffer pH calculation.

Calculates the pH of a buffer solution from pKa and the ratio of conjugate base to weak acid concentrations using the Henderson-Hasselbalch equation.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

pH = pKa + log₁₀([A⁻]/[HA])

In depth

Calculates the pH of a buffer solution from pKa and the ratio of conjugate base to weak acid concentrations using the Henderson-Hasselbalch equation.