Yarn Tool

Twist Multiplier and TPI Calculator

Calculate turns per inch (TPI) from the twist multiplier and yarn count. Typical multipliers: 3.0 to 3.8 for knitting, 3.8 to 4.5 for weaving warp.

Yarn count (Ne)Twist multiplier (TM)

Formula: TPI = TM times the square root of Ne. TPM = TPI times 39.37. Related: Yarn count converter.