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Equilibrium Constant Calculator

K_c from concentrations of products and reactants.

Compute the equilibrium constant K_c from the concentrations of two products (with stoichiometric coefficients 1) divided by the concentrations of two reactants.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

M
M
M
M

Results

Enter values and click Calculate to see results.
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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

K_c = [C][D] / ([A][B]) for the reaction A + B ⇌ C + D.

In depth

Compute the equilibrium constant K_c from the concentrations of two products (with stoichiometric coefficients 1) divided by the concentrations of two reactants.