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Greece never had a king to tell it how long a foot was, and it shows. The Attic pous ran 30.8 cm; Samos used ~34; Pergamon ~33; the Olympic stadion measured 192.3 m while Athens’ ran ~185. Coin weights diverged even further: the Athenian drachma held 4.32 g of silver, Aegina’s 6.1 g, Corinth’s 2.9 g — three “drachmas” that were not the same money at all.
This was not chaos; it was sovereignty. A city’s measures were part of its laws, like its calendar and its gods — changing the foot was as unthinkable as changing the alphabet. The cost was friction, and the Greeks invented an institution to manage it: the money-changer’s table, the trapeza, where every foreign coin was weighed and discounted. “Bank” in half the languages of Europe descends from that table.
What unified the Greek world was not the standard but the system: 16 daktyloi to the foot, 6 obols to the drachma, 60 minae to the talent — the same elegant ratios from Sicily to the Black Sea, filled with different absolute values. Alexander’s conquests spread the pattern further east than any Greek army marched, and the Hellenistic kingdoms spent three centuries slowly converging on the Attic standard — the ancient world’s longest, least-planned standardization.
Convert with the Attic standards (and read the caveats) in the Greek length converter, weight converter, and volume converter.