VASPsol provides support for performing solvation calculations in VASP using an implicit solvation model that describes the effect of electrostatic screening by a polar solvent and the mobile ions in solution, interface formation, and dispersion interaction between the solute and solvent. It provides a computationally efficient means to calculate the effects of solvation on large periodic systems such as metal and semiconductor surfaces and is interoperable with VASP’s standard ultrasoft pseudopotential and projector-augmented wave potential libraries.