The Vapor Pressure Calculator computes the vapor pressure of a solution using Raoult’s Law, where the vapor pressure of the solvent in a mixture equals its mole fraction multiplied by the vapor pressure of the pure solvent: Pvapor=Xsolvent⋅Psolvent∘P_\text{vapor} = X_\text{solvent} \cdot P^\circ_\text{solvent}Pvapor​=Xsolvent​⋅Psolvent∘​. By inputting the mole fraction of the solvent and its pure vapor pressure, the calculator determines the vapor pressure of the solution and shows the formula substitution. This tool is useful for chemistry students studying solutions, colligative properties, and the effect of solute concentration on vapor pressure.