# Gibbs Free Energy Calculator

Gibbs Free Energy Calculator is a free online application for calculating the Gibbs free energy of chemical reactions at constant pressure and temperature.

Enthalpy change (ΔH):
Entropy change (ΔS):
Temperature (T):
Gibbs free energy (ΔG):

## What is Gibbs free energy?

Gibbs free energy is a thermodynamic quantity that measures the potential of a system to do work. It is equal to the enthalpy of the system minus the product of the temperature and the entropy of the system.

## Gibbs free energy equation

The Gibbs free energy equation is G = H - TS, where G is the Gibbs free energy, H is the enthalpy, T is the temperature, and S is the entropy.

Yes, a negative Gibbs free energy indicates that a reaction is spontaneous.
Gibbs free energy can be calculated by subtracting the product of the temperature and the entropy of the system from the enthalpy of the system.
Gibbs free energy tells us the potential of a system to do work and whether a reaction is spontaneous or not.
Gibbs free energy predicts spontaneity by measuring the potential of a system to do work. A negative Gibbs free energy indicates that a reaction is spontaneous.
Gibbs free energy of a reaction can be calculated by subtracting the product of the temperature and the entropy of the reaction from the enthalpy of the reaction.
The units of Gibbs free energy are joules per mole (J/mol).