The densities of the mixtures (hexane or cyclohexane + propan-2-ol or butan-2-ol) at the temperatures (288.15 and 298.15) K have been measured using a vibrating-tube densitometer. Excess molar volumes V-m(E) were calculated. The results were described by means of the ERAS model. All mixtures exhibit positive V-m(E) values over the entire composition range at both temperatures.