The city has an area of . The altitude varies from at the Dâmbovița bridge in Cățelu, southeastern Bucharest and at the Militari church. The city has a roughly round shape, with the centre situated in the cross-way of the main north–south/east-west axes at University Square. The milestone for Romania's Kilometre Zero is placed just south of University Square in front of the New St. George Church (Sfântul Gheorghe Nou) at St. George Square (Piața Sfântul Gheorghe). Bucharest's radius, from University Square to the city limits in all directions, varies from .
