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Free pH
Calculator

Advanced free pH calculator for strong and weak acids/bases, buffers, buffer design and strong acid-base mixing with water autoionization, exact equilibrium solving and local-only processing.

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About Free pH Calculator

Go beyond “−log concentration.” Solve strong and weak acid/base systems, exact monoprotic buffers, strong-acid/base mixing, or reverse-design a buffer — with water autoionization and transparent assumptions.

Workspace options

  • pKw
  • Neutral pH under this setting
  • Type
  • Analytical concentration
  • Fully dissociated acid/base equivalents per formula unit

Available actions

  • ☼ / ◐
  • Strong acid / base
  • Weak acid / base
  • Buffer pH
  • Strong acid + base mix
  • Buffer designer