Densities and viscosities for diethyl carbonate (DEC) with toluene, methanol, and 2-propanol were determined over several temperatures and at atmospheric pressure. The measurements were carried out over the whole mole fraction, using a vibrating-tube densimeter and an Ubbelohde viscometer. Density and viscosity measurements were used to compute the excess molar volumes, V-E, and viscosity deviations, Delta eta. The excess molar volumes, V-E, and viscosity deviations, Delta eta, have been fitted to Redlich-Kister equation.