Byzantine units of measurement

Byzantine units of measurement were a combination and modification of the ancient Greek and Roman units of measurement used in the Byzantine Empire.

Until the reign of Justinian I (527–565), no universal system of units of measurement existed in the Byzantine world, and each region used its traditional measures. Justinian began the process of standardization that resulted in a specifically Byzantine system, chiefly due to the need of such a system for the fiscal administration. Official measurement and weighing was performed subject to an array of charges including the mestikon, miniatikon, zygastikon, kambaniatikon, gomariatikon, and samariatikon. Despite the central government's insistence on the use of official measures, other systems continued to be used in parallel, whether due to local traditions or foreign influences, or in order to cover the necessities of specific trades or crafts. In addition, from the 12th century, foreign merchants such as the Venetians, Pisans, and Genovese operating within the Empire received the right to use their own systems.

The Byzantine Empire continued to employ the anthropometric units used by the Greeks and Romans.

Weights and measures acts were sometimes undertaken by the emperors as forms of tax reform. An 11th-century guide to Byzantine tax collection contains emendations concerning the Emperor Michael's addition of a palm to the fathom used in computing the schoinion, an act which reduced the holders' taxable area by about 5%.

The ordinary units used for land measurement were Greek.

The ordinary units used for liquid measurement were mostly Roman:

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