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Weaving Calculator — Warp, Weft & Yarn Yardage

Plan warp, weft, loom waste, and finished size after you have chosen sett and structure

Warp & Weft Yarn

1,700 yards

Warp Ends

330

Known Sett

15 EPI / 15 PPI

Enter the sett you already chose for this cloth. If you still need an EPI, reed, or sleying starting point, use a dedicated sett-planning tool first and come back here for yarn yardage.

Rigid heddle: ~18″. Floor loom: 27–36″.

Yarn Requirements

1,700 yd
Total yarn needed
Warp Yarn
974 yd
Weft Yarn
726 yd

Warp vs Weft Breakdown

Warp yarn974 yd
Weft yarn726 yd

Warp Details

Total warp ends330
Warp length per end3.0 yd
Width on loom (with draw-in)22.0″
Total weft picks1,080

Finished Dimensions (after take-up)

Width
18.0″
Length
64.8″

Yarn Planning Tips

Buy extra: Add 10–15% to your yarn total for sampling, mistakes, and fringe. Running out mid-project can mean mismatched dye lots.
Sample with your chosen sett: Use a short sample to confirm that your selected sett, take-up, and draw-in assumptions match the cloth you want before you buy final yardage.
Measure loom waste: Loom waste varies widely. Measure your specific loom from the back beam to where you can no longer weave.
Record finishing loss: Wash and finish a sample, then update take-up and draw-in with real numbers so later yardage estimates stay accurate.

Example Calculations

1Kitchen Towel — Plain Weave

Inputs

Width in Reed20 inches
Warp Length3 yards
Sett (EPI)20
Picks Per Inch20

Result

Total Warp Yarn1,400 yards
Total Weft Yarn360 yards
Warp Ends400
Finished Width~18 inches

400 ends × 3.5 yd (3 yd + loom waste) = 1,400 yd warp. Weft: 18 in finished width × 20 PPI × 108 in length = ~360 yd.

2Wool Scarf — 2/2 Twill

Inputs

Width in Reed10 inches
Warp Length2.5 yards
Sett (EPI)15
Picks Per Inch15

Result

Total Warp Yarn450 yards
Total Weft Yarn113 yards
Warp Ends150
Finished Width~9 inches

150 ends × 3 yd (2.5 + loom waste) = 450 yd warp. Weft: 9 in width × 15 PPI × ~80 in woven length = ~113 yd.

Frequently Asked Questions

Q

What does this weaving calculator estimate?

Use this page to calculate warp yardage, weft yardage, warp ends, loom waste, take-up, draw-in, and total yarn once your sett and picks-per-inch are already chosen.

  • Warp yardage: total yards of warp yarn including loom waste
  • Weft yardage: total yards of weft yarn including take-up
  • Warp ends: number of threads across the width at your sett
  • Finished dimensions: width after draw-in, length after take-up
Q

When should I use a separate sett-planning tool?

Use a separate sett-planning tool when you still need to choose ends per inch, a reed starting point, or a sleying suggestion from WPI and weave structure. This page is the next step after that choice is already made.

  • Sett Calculator: choose EPI from yarn WPI and weave structure
  • This page: calculate yardage once sett is already known
  • Use both in sequence: sett first, then yardage
FeatureWeaving CalculatorSett Calculator
InputSett (EPI), width, lengthYarn WPI, weave structure
OutputWarp/weft yardageEPI, reed, sleying plan
StageProject planningYarn/structure selection
Q

Why do loom waste, take-up, and draw-in matter?

They change how much yarn you need and how large the finished cloth will be. If you skip them, you will usually underestimate warp length and overestimate finished size.

  • Loom waste: 18–36 inches of warp lost to tie-on and loom mechanics
  • Take-up: cloth shortens 5–15% as weft interlaces over/under warp
  • Draw-in: cloth narrows 5–10% from weft tension pulling edges inward
  • Plain weave has more take-up than twill due to more interlacement
FactorPlain WeaveTwillLace/Open
Take-up10–15%8–12%5–8%
Draw-in8–10%5–8%5–7%
Loom waste24–36 in24–36 in24–36 in
Q

How do I estimate yarn yardage if I am using handspun?

Measure WPI (wraps per inch) of your handspun yarn to determine sett, then add 15–20% extra yardage because handspun varies in thickness and you may need more for consistent beat.

  • Wrap yarn around a ruler for 1 inch, count wraps = WPI
  • Sett is typically 50–60% of WPI for balanced plain weave
  • Add 15–20% extra yardage for handspun inconsistency
  • Spin a sample and wet-finish before committing to a large project

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Last Updated: Mar 13, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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