Typical DFT calculations produce as output an electronic energy, which can be used to determine the relative stability of different structures or calculate reaction energies. If a vibrational frequency analysis has been performed, the zero-point energy, as well as the enthalpy, entropy, and their components (vibrational, rotational, and translational), can be obtained; from this, one can calculate the molecular Gibbs free energy, which is often a more natural thermodynamic potential, particularly for comparison to experiments at constant temperature and pressure.