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Weaving calculator

Woven Fabric Grid Yarn Placement

Calculate independent thread placement indices and actual grid spacing for reinforcing warp and weft yarns, aligned with weave repeat constraints.

Suggested Warp Grid Thread Index
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Actual Warp Grid Distance
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Suggested Weft Grid Thread Index
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Actual Weft Grid Distance
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Directory

Method and formula

Index=Nearest multiple of repeat for (Density×Spacing)Actual Distance=Thread IndexDensity\begin{aligned} \text{Index} &= \text{Nearest multiple of repeat for } (\text{Density} \times \text{Spacing}) \\[0.5em] \text{Actual Distance} &= \frac{\text{Thread Index}}{\text{Density}} \end{aligned}

Input variables

VariableExpected entry
Ends Per Inch (EPI)Enter a positive measured value.
Picks Per Inch (PPI)Enter a positive measured value.
Target Warp Grid SpacingEnter a positive measured value.
Target Weft Grid SpacingEnter a positive measured value.
Warp Weave RepeatEnter a positive measured value.
Weft Weave RepeatEnter a positive measured value.
Spacing UnitChoose: Millimeter, Centimeter, Inch

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

  • Suggested Warp Grid Thread Index
  • Actual Warp Grid Distance
  • Suggested Weft Grid Thread Index
  • Actual Weft Grid Distance