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Gibbs Free Energy from Equilibrium Constant Calculator

ΔG° = −R · T · ln(K) — links K to spontaneity.

Compute the standard Gibbs free-energy change ΔG° of a reaction from its thermodynamic equilibrium constant K and temperature T: ΔG° = −R · T · ln K, with R = 8.314 J·K⁻¹·mol⁻¹. K > 1 ⇒ ΔG° < 0 (products favoured); K < 1 ⇒ ΔG° > 0 (reactants favoured).

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

Inputs

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

ΔG° = −R · T · ln K.

In depth

Compute the standard Gibbs free-energy change ΔG° of a reaction from its thermodynamic equilibrium constant K and temperature T: ΔG° = −R · T · ln K, with R = 8.314 J·K⁻¹·mol⁻¹. K > 1 ⇒ ΔG° < 0 (products favoured); K < 1 ⇒ ΔG° > 0 (reactants favoured).