An empirical method is suggested which permits the prediction of vapor-liquid equilibrium data for binary hydrocarbon mixtures at various total pressures on the basis of equilibrium data at one constant pressure. This method has been tested with the vapor-liquid equilibrium data of six nonideal systems measured at twenty-one different experimental conditions. The total pressure range varies from 50 mm. of mercury to 4 atm. In all cases the predicted results are in good agreement with the experimental data.