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

Equilibrium constant K

Required number input.

Temperature (K)

Required number input.

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

Gibbs free energy (kJ/mol)

The resulting gibbs free energy returned as a number.

• 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).

• Gibbs-Helmholtz Calculator

  Compute the Gibbs free energy change as ΔG = ΔH − T·ΔS.

• Activation Energy Two-Temperature

  Compute activation energy in J/mol from rate constants at two temperatures as R times ln(k2/k1) over one over T1 minus one over T2.