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Gibbs Free Energy ΔG = ΔH − TΔS Calculator

ΔG = ΔH − TΔS — spontaneity of a reaction at temperature T.

Calculates Gibbs free energy change ΔG from enthalpy ΔH and entropy ΔS at any temperature to determine 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; ΔG < 0 → spontaneous

In depth

Calculates Gibbs free energy change ΔG from enthalpy ΔH and entropy ΔS at any temperature to determine reaction spontaneity.