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Jammed Knitted Fabric Geometry & Properties

Calculate loop length, courses per inch (CPI), wales per inch (WPI), and stitch density for fully jammed knitted structures based on yarn diameter.

Loop Length l (mm)
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Courses Per Inch (CPI)
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Wales Per Inch (WPI)
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Stitch Density (loops / sq. inch)
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Method and formula

c=12×d(Course spacing)w=4×d(Wale spacing)l=16.62×d(Loop length)C (course per unit length)=1c=4.8l,W (wales per unit length)=1w=4.15lStitch Density (loops per unit area)= C×W=20l×l\begin{aligned} c &= \sqrt{12} \times d \quad (\text{Course spacing}) \\[1em] w &= 4 \times d \quad (\text{Wale spacing}) \\[1em] l &= 16.62 \times d \quad (\text{Loop length}) \\[1em] \text{C (course per unit length)} &= \frac{1}{c} = \frac{4.8}{l}, \quad \text{W (wales per unit length)} = \frac{1}{w} = \frac{4.15}{l} \\[1em] \text{Stitch Density (loops per unit area)} &= \ C \times W = \frac{20}{l \times l}\end{aligned}

Input variables

VariableExpected entry
Yarn Diameter (d)Enter a positive measured value.
Diameter UnitChoose: Millimeter, Micron

Calculation workflow

  1. Enter the measurements in the displayed units.
  2. Check the selected yarn, fiber, weave, or trade unit where shown.
  3. Review each calculated output and its unit.
  4. Use Copy results to save the displayed values to recent history.

Outputs

  • Loop Length l (mm)
  • Courses Per Inch (CPI)
  • Wales Per Inch (WPI)
  • Stitch Density (loops / sq. inch)