Spinning Wheel Ratio Calculator

Drive ratio from whorl and drive wheel diameters.

Drive wheel diameter (in)

Whorl diameter (in)

Treadle speed (RPM)

Target TPI

Tab to move between fields

Drive ratio

Flyer RPM660

Twists per minute660

Drafting speed (ft/min)9.2

Yarn output (yd/hr)183.3

Yarn Weight CategoryWorsted / Aran

How to Use This Calculator

Measure and enter your spinning wheel's drive wheel diameter in inches.
Measure the whorl (pulley) diameter in inches for the whorl you are currently using.
Enter your comfortable treadling speed in RPM (a relaxed pace is typically 50–80 RPM).
Enter your target TPI for the singles yarn.
Read the drive ratio and flyer RPM to understand how fast your flyer is spinning.
Use the drafting speed in ft/min output to calibrate how fast to draft fiber for your target TPI.

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