How do calculate yarn length, count & weight

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Pls find below some rules for calculate yarn length, count & weight.

Length (in yards) = Count *840 *weight of yarn in pound

Count = Length / weight of yarn in pounds*840

Weight of yarn = length/count *840

Note: as per definition count is a relationship between length and weight of yarn. English count is defined as number of hanks in one pound. Hank means a certain length. It is different for different fibers. For details see tables given in the end of book. For explanation purpose we will use English count of cotton. For cotton length of hank is 840 yards. For other fibers use relevant length of hank.

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