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Gibbs-Helmholtz Free Energy Calculator

ΔG = ΔH − T·ΔS — spontaneity from enthalpy and entropy.

Calculates Gibbs free energy change ΔG from enthalpy ΔH, temperature T, and entropy change ΔS, indicating reaction spontaneity.

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

Inputs

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

In depth

Calculates Gibbs free energy change ΔG from enthalpy ΔH, temperature T, and entropy change ΔS, indicating reaction spontaneity.