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Both calculators run independently — change the inputs on either side to compare results.

Thermodynamics and Enthalpy Calculator

Calculate Gibbs free energy and enthalpy changes for chemical reactions. Use this when predicting reaction spontaneity or thermodynamic feasibility at a given temperature and pressure.

Enthalpy Change (ΔH) (kJ/mol)

Entropy Change (ΔS) (J/(mol·K))

Temperature (K)

Pressure Correction

Fill in the required fields to see your result.

Chemistry

Equilibrium Constant Calculator

Calculates the equilibrium constant Kc from product and reactant concentrations for a simplified 1:1 stoichiometry reaction. Use it in general chemistry to predict reaction favorability.

Product 1 Concentration (M)

Product 2 Concentration (M)

Reactant 1 Concentration (M)

Reactant 2 Concentration (M)

Temperature (K)

Fill in the required fields to see your result.

Key differences

	Thermodynamics and Enthalpy Calculator	Equilibrium Constant Calculator
Category	Chemistry	Chemistry
Inputs required	4	5
Result	Gibbs Free Energy (ΔG) (kJ/mol)	Equilibrium Constant (Keq)
What it does	Calculate Gibbs free energy and enthalpy changes for chemical reactions. Use this when predicting reaction spontaneity or thermodynamic feasibility at a given temperature and pressure.	Calculates the equilibrium constant Kc from product and reactant concentrations for a simplified 1:1 stoichiometry reaction. Use it in general chemistry to predict reaction favorability.