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Weaving Warp Length Calculator

Work out weaving warp length instantly with clear inputs, formula shown and shareable results.

About Weaving Warp Length Calculator

Each warp end must cover the finished length plus take-up and shrinkage plus loom waste, and the total yarn is that length multiplied by the number of ends. Loom waste is a fixed length regardless of project size, which is why short warps are so inefficient and weavers batch several projects on one warp.

Formulas

Warp length

per end = finished length x (1 + take-up) + loom waste

Total yarn

total = warp length x number of ends

Worked example

With the default values below, Weaving Warp Length Calculator returns Length of each warp end of 280.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number of warp endsminimum 1
400
Finished project lengthminimum 1 cm
200 cm
Loom wasteminimum 0 cm
60 cm
Take-up and shrinkage allowanceaccepts 0–50 %
10 %

Results

Length of each warp end
280.0 cm
Total warp yarn needed
1,120.0 m
Length lost to take-up
20.0 cm
Total warp in yards
1,224.8 yd

Step by step

  1. 1Values used
  2. 2Warp length
  3. 3Total yarn
  4. 4Length of each warp end= 280.0 cm
  5. 5Total warp yarn needed= 1,120.0 m
  6. 6Length lost to take-up= 20.0 cm
  7. 7Total warp in yards= 1,224.8 yd

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Weaving Warp Length figure worked out?

per end = finished length x (1 + take-up) + loom waste. Each warp end must cover the finished length plus take-up and shrinkage plus loom waste, and the total yarn is that length multiplied by the number of ends.

Why does this matter?

Loom waste is a fixed length regardless of project size, which is why short warps are so inefficient and weavers batch several projects on one warp.

What do I need to enter?

Enter number of warp ends, finished project length, loom waste, take-up and shrinkage allowance. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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