About calculation of single point energy

[saurabh_911]

Hello,

I am bit new to this. I have optimized the geometry of two structures using B3LYP functional program and def2-TZVP as basis set. I wanted to calculate single point energy of two structures and compare between the two, so using same sets I did the calculations. I have obtained the values of total energy as -1529.162040 and -1529.708705355. what would be the units of these values? if the units are hartree fock then it gives me a huge negative values. I want to compare them in kJ/mol and kCal/mol. Please guide me.

Thank you.

[christof.haettig]

If no other units are specified the results are in atomic units (au).
You find the conversion factors in the literature or the www (search for CODATA).

Christof