Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

ΔH (kJ/mol)

Reaction enthalpy change.

ΔS (J/(mol·K))

Reaction entropy change.

Temperature (K)

Absolute temperature; must be greater than zero.

Compute the Gibbs free energy change as ΔG = ΔH − T·ΔS. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

ΔG (kJ/mol)

Gibbs free energy change.

• Thermodynamic quantities are state- and temperature-dependent and must use consistent reference states and sign conventions. Heat loss, phase changes, non-ideal mixing, path-dependent work, and heat-capacity variation may need separate treatment.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Cell Potential From Gibbs Calculator

  Convert Gibbs free energy change to cell potential via E° = −ΔG/(nF).

• Delta G From K

  Compute Gibbs free energy change in kJ per mole from the equilibrium constant as -R times T times ln(K).

• Gibbs Free Energy From Cell Potential Calculator

  Convert cell potential to Gibbs free energy via ΔG = −nFE with F = 96485 C/mol.