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According to the paper by Gary Holian in Oerth Journal, Oerth's circumference is about 42,024 km, and its radius measures 6,714 km, about 1% more than that of Earth. There is no flattening of the planet sphere due to rotation, and divine power is again hinted at.
Only about one sixth of Oerth's surface, the Flanaess, is accurately detailed. Data on Aquaria and Hepnomaland are based on fanwork, and these continents are not officially supported by the game's publisher, TSR.
The name Oerth is similar to Aerth, the world of Jack Vance's novels, which in turn is an anagram of Earth.