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Gibbs Free Energy Calculator

Gibbs Free Energy Calculator

Precisely figure out the Gibbs free energy to determine the nature of the chemical reaction with the Gibbs free energy calculator.

Enthalpy change (ΔH) :


Entropy change (ΔS) :


Temperature (T) :



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Estimate the Gibbs free energy of a chemical reaction through this calculator and determine whether it can happen spontaneously or not.

When you are able to know the nature of the chemical reaction by the utilization of a Gibbs free energy calculator, you can manage the environmental factors relatively for the happening of a process. 

Understanding What Is Gibbs Free Energy?

This is a term of physics that is used in thermodynamics to define the maximum amount of reversible work that can be performed on a system under constant pressure and temperature. 

It is represented by G or ΔG (delta G). ΔG also helps in predicting the direction of the chemical reaction. 

Gibbs Free Energy Units:

The SI units that are used for Gibbs Energy are joules and kilojoules. 

Why Do We Calculate Gibbs Free Energy?

Gibbs energy allows you to relate the enthalpy change and entropy of a system to understand whether a process is spontaneous or nonspontaneous. 

Delta g spontaneous: 

If  ΔG < 0, then it means that the process is spontaneous and the direction is forward. Meanwhile, it will not require external energy to happen. When this happens the system goes towards the lower energy state.


If  ΔG > 0, then it shows that the process is non-spontaneous but in the forward direction. It will require inputting the external energy for the happening of the process.  


When ΔG = 0, it means the system is in equilibrium state. Meanwhile, the forward and reverse processes are happening at the same rate and same time. 

Gibbs Free Energy Equation:

Let’s take a look at the following delta g formula:



  • ΔG represents the free energy change
  • ΔH shows the change in enthalpy (total heat) at constant pressure
  • T is the representative of absolute temperature
  • ΔS is the variance in the entropy

How To Calculate Gibbs Free Energy?

Below we have outlined the steps to find out Gibbs Energy:

  • First of all, you must have the change in enthalpy
  • Determine the temperature change
  • Now according to the delta g equation, multiply the temperature by the entropy and subtract it from the enthalpy of the system

If you don’t want to use Gibbs free energy equation to perform the calculation then get the help of an online Gibbs free energy calculator. It will let you calculate the Gibbs Energy instantly. 

Practical Example:

Suppose the Enthalpy change (ΔH) is 50 KJ, Entropy change (ΔS) is 45 KJ, and Temperature (T) is 30 K in a reaction. Then how to find delta g.


Given that:

Enthalpy change (ΔH) = 50 KJ

Entropy change (ΔS) = 45 KJ

Temperature (T) = 30 K

Now put these values in the Gibbs free energy formula:


ΔG  = 50 – 30 x 45

ΔG = -1300 KJ

How Does Our Gibbs Free Energy Calculator Work?

This delta g calculator displays the Gibbs energy associated with a chemical reaction in no time by just taking a couple of simple inputs. 

What Do You Need To Enter?

  • Enthalpy change (ΔH)
  • Entropy change (ΔS)
  • Temperature (T)

This Is What You Will Get!

  • Gibbs free energy (ΔG)
  • Step-by-step calculation
  • Informs about whether the process is spontaneous, non-spontaneous, or equilibrium. 


What Is The Relationship Between Entropy And Gibbs Free Energy?

Gibbs energy and entropy are related through the Gibbs-Helmholtz equation and allow us to understand the happening of a process.  The direction of the processes depends upon the enthalpy and the entropy change.

What Is The Difference Between Entropy And Enthalpy?

Enthalpy is the amount of energy stored in a compound, while entropy is the disorder within the compound. Entropy is the measure of disorder. 

What Happens To Gibbs Free Energy As Entropy Increases?

When the entropy increases the Gibbs energy decreases. Gibbs energy and Entropy are inversely proportional to each other.

What Is Free Energy?

This is an energy-like state of the system in which the system is in thermodynamic equilibrium. Its value is known by the state of the system. Use a Gibbs free energy calculator to calculate it seamlessly. 


From the source of Gibbs free energy

From the source of An introduction to Gibbs free energy.