Spinning WPI Calculator

This will calculate the approximate size (in Wraps Per Inch) of singles you should spin in order to create a specific final yarn with the given number of plies.  Formula from  The Alden Amos Big Book of Handspinning: Being a Compendium of Information, Advice, and Opinion on the Noble Art and Craft

Size of final yarn in WPI:

Number of plies in final yarn:

Calculate!

WPI of singles yarn should be:

(will be populated here)