The article describes and implements a method for estimating the seating capacity of Roman amphitheaters that takes account of existing scholarship. The resulting total estimated capacity is approximately three million. Mapping the distribution of these seats emphasizes that a large share were in Italy, with many also in central North Africa. This observation adds to the well-known aspect of amphitheaters that they are not evenly distributed throughout Roman territory. While amphitheaters are an important phenomenon in the Roman world, the variability of access to them should be kept in mind.