WeaveCompass

Weaving project planner

Calculate warp ends, winding length and yarn to buy. Start with an example, then use your own measurements.

Free · no sign-up

Your project

An editable scarf example is loaded. Replace the measurements before planning your own project.

New to weaving? Start with these three steps
  1. Choose finished cloth dimensions and your loom’s usable width.
  2. Enter warp threads and weft picks per inch or cm, then measured sample allowances.
  3. Calculate, check the warnings, and export a backup before winding.

Warp runs lengthwise; weft crosses it. Sett is warp thread density. How to measure a sample.

in
Exclude fringe and floating ends.
in
Include cloth for hems; exclude fringe.
One outside waste allowance per warp.
in
Usable width, not overall loom size.
per in
Warp threads per selected unit (EPI in inches). Use a sample or draft.
per in
Weft passes per selected unit (PPI in inches), measured on the loom.
Sample and yarn allowances
%
Width loss, including draw-in and finishing.
%
On-loom cloth → finished cloth.
%
Extra straight yarn per on-loom cloth length.
%
Beyond a straight reed-width pass.
in
Both outside ends, including outside fringe.
in
On-loom cloth; budgeted for warp and weft.
in
Includes both neighboring fringes.
%
Spare yarn to buy; does not lengthen warp.
Threading adjustments
Body ends round up to complete this repeat.
Added to yarn, not body width.

Example percentages are editable assumptions. Use a measured sample before winding a full project.

Your winding & shopping plan

Everyday scarf

—
total warp ends
—
wind each end

Warp yarn to buy
—
Weft yarn to buy
—
Combined yarn length—

Keep warp and weft shopping quantities separate when using different yarns. Round up packages for each yarn and color.

At the loom
Body width in reed:
Expected finished body width after repeat rounding:
Weave each piece:
Gray: outside waste · Gold: sample · Blue: cloth · Pale blue: gaps
Yarn length proportions. Outside waste is shown split evenly.

Keep this project

Save locally keeps one project in this browser and replaces its previous saved copy. Export project downloads a JSON backup you can import on another device.

A useful estimate starts with a sample.

Measure your yarn and cloth, keep each allowance separate, and make the next project easier to plan.

Make a sample record

Take your planning desk offline.

One-time kits add offline tools, saved project collections, inventory, and batch reports.

Explore the offline kits

One question? Start here.

All 14 tools
Plan your warp

Warp length calculator

Find how long to wind each end, including shrinkage, take-up, loom waste, and gaps.

Plan your warp

Warp yarn yardage calculator

Turn an end count and winding length into total warp yarn and a purchase reserve.

Plan your warp

Weft yarn calculator

Estimate weft from on-loom length, reed width, pick density, and extra yarn per pick.

Measure and adjust

Weaving shrinkage calculator

Measure sample loss or growth and calculate the starting size needed for a finished target.

Plan your warp

Warp ends and threading repeat calculator

Calculate body ends, round up to a complete threading repeat, and add floating ends.

At the loom

Reed substitution calculator

Find a repeating ends-per-dent sequence and see the sett it actually produces.