basic

Equilibrium Constant from Gibbs Free Energy Calculator

K = exp(−ΔG° / (R·T)) — links thermodynamics to equilibrium.

Compute the thermodynamic equilibrium constant K from a reaction's standard Gibbs free energy change ΔG° (kJ/mol) at temperature T using K = exp(−ΔG° / (R·T)). Negative ΔG° → K > 1 (products favoured); positive ΔG° → K < 1 (reactants favoured).

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

Inputs

kJ/mol
K

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 = exp(−ΔG° / (R·T)), R = 8.314 J·K⁻¹·mol⁻¹.

In depth

Compute the thermodynamic equilibrium constant K from a reaction's standard Gibbs free energy change ΔG° (kJ/mol) at temperature T using K = exp(−ΔG° / (R·T)). Negative ΔG° → K > 1 (products favoured); positive ΔG° → K < 1 (reactants favoured).