basic

Gibbs Free Energy Calculator

ΔG = ΔH − T · ΔS.

Compute the change in Gibbs free energy ΔG from the change in enthalpy (kJ/mol), entropy (J/mol·K), and temperature (K), to predict whether a reaction is spontaneous.

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

Inputs

kJ/mol
J/(mol·K)
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 = ΔH − T · ΔS. With ΔH in kJ/mol and ΔS in J/(mol·K), divide TΔS by 1000 first.

In depth

Compute the change in Gibbs free energy ΔG from the change in enthalpy (kJ/mol), entropy (J/mol·K), and temperature (K), to predict whether a reaction is spontaneous.