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Henderson–Hasselbalch

Calculate Henderson–Hasselbalch instantly. Free online calculator with the exact formula, a worked example, and metric units. No signup required.

Henderson–Hasselbalch

pKa
[A−]
[HA]
Buffer pH
4.76
pH = pKa + log([A−]/[HA])Calculate Henderson–Hasselbalch instantly. Free online calculator with the exact formula, a worked example, and metric units. No signup required.

More about: Henderson–Hasselbalch

What it calculates

The “Henderson–Hasselbalch” calculator computes Buffer pH from 3 parameters: pka, [a−], [ha].

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters pKa = 4.76, [A−] = 0.1, [HA] = 0.1 the result is 4.76 (pH = pKa + log([A−]/[HA])).

How to use

  1. Enter pka, [a−] and [ha] — each field above is adjustable with a slider.
  2. Buffer pH is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is Henderson–Hasselbalch calculated?
The Henderson–Hasselbalch calculator computes Buffer pH from pka, [a−], [ha]. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Henderson–Hasselbalch calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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