Pressure-density-temperature data (10 655 data points) in the gas and liquid homogeneous phases and in the bulk zone are reported for 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea). The measurements have been performed with a vibrating tube densimeter over 12 isotherms at temperatures between 253 K and 403 K and pressures up to 20 MPa. The uncertainties of temperature and density measurements are less than 0.02 K and 0.1 kg m(-3), respectively. The uncertainty on the pressure values is less than 2 x 10(2) Pa in the vapor phase and less than 2 x 10(3) Pa in the compressed liquid phase. A correlation for saturated liquid density has been developed from the present data. Furthermore, a comparison is made between experimental data and a semipredictive density model.