Gibbs Free Energy Calculator


About Gibbs Free Energy Calculator (Formula)

A Gibbs Free Energy Calculator is a tool used to calculate the change in Gibbs free energy during a chemical reaction or a physical process. Gibbs free energy is a thermodynamic concept that indicates whether a reaction is spontaneous (can occur without external influence) and if it can perform useful work.

Formula for Gibbs Free Energy Calculation:

The formula for calculating Gibbs free energy change (∆G) is:

∆G = ∆H – T∆S


  • ∆G: Change in Gibbs free energy.
  • ∆H: Change in enthalpy (heat content) of the system.
  • T: Temperature in Kelvin.
  • ∆S: Change in entropy (disorder) of the system.

The sign of ∆G determines the spontaneity and direction of a process:

  • If ∆G is negative, the process is spontaneous and can occur without external influence (exergonic).
  • If ∆G is positive, the process is non-spontaneous and requires external influence (endergonic).
  • If ∆G is zero, the system is at equilibrium.


  1. Chemical Reactions: Chemists use the Gibbs Free Energy Calculator to predict the spontaneity and direction of chemical reactions.
  2. Thermodynamic Analysis: Engineers use Gibbs free energy calculations to analyze and optimize energy conversion processes.
  3. Biochemistry: The calculator is used to understand biological processes and enzyme-catalyzed reactions.
  4. Phase Transitions: Gibbs free energy calculations help in understanding phase transitions like melting and vaporization.
  5. Equilibrium Studies: Scientists use Gibbs free energy to determine equilibrium conditions in chemical systems.
  6. Environmental Chemistry: The calculator aids in understanding natural processes involving energy changes.

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