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Calcimator

Yarn Quantity Calculator

Warp and weft yardage from project dimensions and sett.

Inputs

%
%
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Results

Warp yarn needed (yards)

772

Weft yarn needed (yards)

556

Total warp ends240
Total weft picks909
Total yarn (yards)1,327
Width on loom (inches)20
How to Use This Calculator
  1. Enter the desired finished length and width in inches after washing.
  2. Set EPI (warp sett) and PPI (weft sett) for your project.
  3. Enter the loom waste, take-up, shrinkage, and draw-in percentages for your fiber and weave structure.
  4. Read the warp yarn needed in yards and the weft yarn needed in yards.
  5. Add the warp and weft totals to get combined yardage for purchasing the same yarn for both.
  6. Use the width on loom output to confirm the project fits your loom before winding.

How the result changes with Finished width (inches)

Finished width (inches)Warp yarn needed (yards)Weft yarn needed (yards)
13556401
431,8431,327
783,3452,407
1084,6323,333

What each input means

Finished length (inches)
Desired finished length of the woven piece in inches.
Finished width (inches)
Desired finished width after washing and draw-in.
Ends per inch (EPI)
Warp sett — number of warp threads per inch.
Picks per inch (PPI)
Weft sett — number of weft rows per inch.
Loom waste (inches)
Unweavable warp at front and back of loom (typically 18-36 in).
Take-up %
Warp shortens as weft interlaces. Plain weave ~10%.
Shrinkage %
Length and width lost after wet-finishing.
Draw-in %
Width narrowing from weft tension. Typically 5-10%.

What each result means

Total warp ends
Total number of warp threads.
Warp yarn needed (yards)
Total warp yardage including waste and allowances.
Total weft picks
Total number of weft passes.
Weft yarn needed (yards)
Total weft yardage including interlacement allowance.
Total yarn (yards)
Combined warp and weft yardage.
Width on loom (inches)
Width to warp on the loom before draw-in.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Finished length (inches) = 72, Finished width (inches) = 18, Ends per inch (EPI) = 12, Picks per inch (PPI) = 12 = 8 input(s) provided
  2. Calculate Warp yarn needed
    Warp yarn needed = (totalEnds * warpLengthInches) / 36
    772 = 772
  3. Calculate Weft yarn needed
    Weft yarn needed = (totalPicks * weftPerPick) / 36
    556 = 556
  4. Calculate Total warp ends
    Total warp ends = round(widthOnLoom * epi)
    240 = 240
  5. Calculate Total weft picks
    Total weft picks = round(wovenLength * ppi)
    909 = 909

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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