What does the buffer designer calculate?

It uses the Henderson–Hasselbalch equation to split total concentration into acid/base amounts for a target pH and pKa.

What are the required inputs?

Target pH, pKa, total buffer concentration, and final volume. Molar masses are optional but enable mass (g) estimates.

It converts required moles into volumes from your acid/base stock concentrations and estimates how much water to add.

Yes. Use the Buffer check section to compute pH from measured acid/base masses or moles.

No. All calculations run locally in your browser (offline-friendly).

Set a target pH, choose a conjugate pair, and estimate the acid/base split for your buffer.

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Buffer preset

Select a common buffer to autofill pKa and molar masses.

Target pH pKa (conjugate pair) Total buffer concentration (M) Final volume

Acid molar mass (g/mol) Base molar mass (g/mol)

Convert required moles into volumes from available acid/base stock solutions.

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Acid stock concentration (M) Base stock concentration (M) Acid required (mol) Base required (mol)

Verify the pH from measured acid/base masses or moles and adjust as needed.

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Acid mass (g) Base mass (g) Acid molar mass (g/mol) Base molar mass (g/mol) Final volume

pKa