An phenomenological equation-of-state model has been developed for simple, monatomic metals to cover the temperature and pressure ranges of 0-1 eV and 0-1 TPa. The normalization of the model to extensive experimental data on Pb is discussed as an example. The resultant equation-of-state in a mixed tabular-analytic form should be useful in technical applications where the temperature and pressure dependence of the compressibility is important. The physical basis of the model is outlined.