Is this tool completely free?

Yes, this tool is 100% free to use with no hidden costs, trials, or subscriptions required.

Do I need to register or sign up?

No registration or sign-up required. Simply use the tool directly in your browser.

No, all processing happens locally in your browser. Your data never leaves your device, ensuring complete privacy.

Yes, once loaded, many features work offline thanks to Progressive Web App technology.

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

Buffer preset

Select a common buffer to autofill pKa and molar masses.

Target pH pKa (conjugate pair) Total buffer concentration (M) Final volume (L) Acid molar mass (g/mol) Base molar mass (g/mol)

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

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.

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