Persian carpet has been woven on the basis of designs and patterns for a long time. The weaving of carpet according to dimensions proportionate to the established principles in terms of context and design indicates such computational principles. Carpet experts use basic units or time scales to calculate carpet’s drawing anddetailedfactorssuch asfees for the workmen.Unfortunately, no comprehensive and systematic research has been done on the principles and bases of computationsfor drawing sheets.This researchwas conductedusing desk study and field study methods, where evolution ofcarpetdrawings, measurementunits andbasesfor drawing mapcalculations,drawing sheetsand workmenpayment have been studied. As a result of this study a special and detailed look into the carpet and its associated elements become clear, and the reason, thought and knowledge behind this applied art is revealed. This valuable knowledge and experience can possibly be conveyedto contribute the revival of this art.