This is the only study to date that provides full documentation of the metric dimensions within the Temple of Jupiter at Pompeii. These dimensions constitute an important class of evidence in their own right and must be considered when discussing the temple as a whole and its architectural history. The utility of such a study is that metric dimensions can be converted easily to Oscan or Roman feet.

The first goal of the article is to provide raw data that allow us to address the question of whether the temple was designed in Oscan or Roman feet. The second is to assess the evidence that reveals the ubiquitous use of the Roman foot that, in turn, argues for a post-89 BCE Roman date for the temple. In the process of our documentation we discovered that the columns in the pronaos are no longer in their ancient locations, and that a correct placement reveals that the Temple of Jupiter conforms to the Vitruvian pycnostyle type of Roman temple (Tables 9-11). The Pompeii Forum Project is abbreviated below as PFP.