We present densities of pure 2-butanol and tert-butanol from 283.15 to 363.15 K and 303.15 to 363.15 K at pressures up to 66 MPa. We have measured the densities using a vibrating tube densimeter, and the calibration of the apparatus uses the forced path calibration method (FPMC). This calibration method depends upon the mechanical properties of the cell and allows us to have a standard uncertainty in the density less than 0.0004 g/cm3. The new experimental densities of agree within 0.1% with densities in the literature.