How to calculate exciton binding energy using TDDFT?

Does Qchem support to calculate exciton binding energies with TDDFT .out files?

The exciton binding energy is the difference between the fundamental gap (IE - EA) and the optical gap (lowest excitation energy, e.g., from TDDFT). You would need to compute the IE and the EA separately. See this paper for some definitions and some benchmarking:

Thank you for the information.