Twist Per Inch Calculator

TPI from fiber type and desired yarn characteristics.

Target WPI

Twist multiplier

Number of plies

Staple length (in)

Tab to move between fields

TPI (calculated)

18.83

TPI (balanced rule)3.46

Twist angle (°)78.5

Singles TPI18.83

Plying TPI13.31

Twists per staple75.3

Approx yarn count (Ne)22.15

How to Use This Calculator

Enter the target WPI (wraps per inch) of your yarn.
Set the twist multiplier for your fiber: wool worsted 3.5–4.5, woolen 4.5–6, cotton 3.5–4.5, silk 2.5–3.5.
Enter the number of plies for the finished yarn.
Enter the staple length in inches of your fiber.
Read the calculated TPI and the balanced-rule TPI as two complementary starting points.
Check the twists per staple output — a value above 1 confirms sufficient twist for yarn integrity.

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