Density, speed of sound, and refractive index measurements were conducted for the systems of pentan-2-one + propan-2-ol/butan-2-ol in the temperature range 298.15-338.15 K and at atmospheric pressure (0.101 MPa). The excess molar volume, excess speed of sound, excess isentropic compressibility, excess thermal expansion, and excess refractive index were calculated from the measured data. A positive excess molar volume was observed for the temperature range measured here for the pentan-2-one + propan-2-ol and pentan-2-one + butan-2-ol systems with excess molar volume increasing with temperature. These behaviors, along with other calculated excess properties, were correlated by the Redlich Kister polynomial.