basic

pKa ↔ pKb Conversion Calculator

pKa + pKb = 14 (at 25 °C, in water).

Convert between the acid dissociation constant exponent pKa and its conjugate-base counterpart pKb using the water relationship pKa + pKb = pKw, where pKw = 14.00 at 25 °C.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

pKa + pKb = pKw (= 14.00 at 25 °C)

In depth

Convert between the acid dissociation constant exponent pKa and its conjugate-base counterpart pKb using the water relationship pKa + pKb = pKw, where pKw = 14.00 at 25 °C.