Gibbs Free Energy Calculator

Calculate the standard change in Gibbs free energy (ΔG) to determine reaction spontaneity.

Thermodynamic Parameters

Enthalpy Change (ΔH)

kJ/mol

Entropy Change (ΔS)

J/mol·K

Temperature (T)

Calculation Results

Enter thermodynamic values to determine spontaneity

About this calculator

Overview

Gibbs Free Energy (ΔG) combines enthalpy and entropy to predict the direction of a chemical reaction at constant temperature and pressure.

💡

Pro Tips

Fun Facts

"Josiah Willard Gibbs was awarded the first American doctorate in engineering."
"A negative ΔG means a reaction can proceed without external energy input (exergonic)."
"ATP hydrolysis drives cellular processes because it has a highly negative ΔG."
"ΔG = 0 at equilibrium; the reaction is neither spontaneous nor non-spontaneous."
"Gibbs free energy determines the maximum work a system can perform."
"The relationship ΔG = ΔH - TΔS explains why some endothermic reactions are spontaneous."
"Gibbs energy is named after Josiah Gibbs, who also invented vector analysis."

Formula: ΔG = ΔH - TΔS