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Buffer pH Calculator

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Calculate pH of a buffer solution using the Henderson-Hasselbalch equation.

Dr. Lena FischerVerified

PhD Chemistry (Analytical), MRSC

Analytical chemist with 12 years in pharmaceutical QA, spectroscopy, and solution chemistry. Passionate about making chemistry accessible.

pKa of weak acid

Concentration of conjugate base (mol/L)

Concentration of weak acid (mol/L)

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About the Buffer pH Calculator

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

How it works

pH = pK_a + \log\left(\frac{[A^-]}{[HA]}\right)

Tips to improve your result

1.
A buffer works best when the pH is within ±1 unit of the pKa.
2.
Equal concentrations of acid and conjugate base give pH = pKa.

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