units conversion

Hi, all lammps user,

I am confused about units conversion in lammps. For example, in real units, energy units is Kcal/mol, while in metal units, energy units is eV. How could I conver Kcal/mol to eV. I am simulating the gold nanoparticle in water with metal units, however, potential of water are usually given in real units, So I have to conver that to metal units. Sadly, I failed. Does anyone could help me?