Buffer pH Calculator (Henderson–Hasselbalch)
pH of a buffer solution from pKa and the concentrations of conjugate base and acid.
How to use the Buffer pH Calculator
- Enter or select: pKa, [A⁻] conjugate base, [HA] acid.
- The results (pH, Ratio [A⁻]/[HA]) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- pH = pKa + log₁₀([A⁻]/[HA])