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Calcimator

Drafting Ratio Calculator

Draw ratio from fiber diameter and target yarn count.

Inputs

Results

Total draft ratio

490

Per-zone draft490
Singles yards/lb19,600
Finished yarn yards/lb9,800
Roving per yard singles (g)0.02
Attenuation Factor490
TechniqueExtreme long draw — consider pre-drafting roving
How to Use This Calculator
  1. Enter the yards per pound of your roving or top (check the label or weigh a known length).
  2. Enter the target WPI (wraps per inch) of your desired finished yarn.
  3. Set the number of plies you plan to spin and ply together.
  4. Enter the number of drafting zones on your wheel or frame (1 for hand spinning).
  5. Read the total draft ratio — this tells you how far to attenuate the fiber from roving to singles.
  6. Use the singles yards per pound and finished yarn yards per pound outputs to plan your fiber purchase.
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