Yarn Twist (TPI & TPM)

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Twists per inch and per metre from the twist multiplier and count, or from spindle speed and delivery

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Enter the values

What to work out

Count (Ne)

Twist multiplier (TM)

Use your mill's value for the yarn type and end use

Result

Twists per inch (TPI)

21.909

Twists per metre (TPM)

862.55

Working

Formulas

Assumptions

Ring spinning; traveller slip and contraction are ignored, so measured twist can be slightly lower.

Sources: W. Klein, The Technology of Short-staple Spinning; J. E. Booth, Principles of Textile Testing

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