Enter the warp cover factor and the warp count into the Calculator. The calculator will evaluate the Ends Per Inch. 

Ends Per Inch Formula



  • EPI is the Ends Per Inch (ends/in)
  • WCF is the warp cover factor
  • WC is the warp count

To calculate Ends Per Inch, multiply the warp cover factor by the square root of the warp count.

How to Calculate Ends Per Inch?

The following steps outline how to calculate the Ends Per Inch.

  1. First, determine the warp cover factor. 
  2. Next, determine the warp count. 
  3. Next, gather the formula from above = EPI = WCF * SQRT(WC).
  4. Finally, calculate the Ends Per Inch.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

warp cover factor = 3.4

warp count = 2