References you can check.

1. Weaving yarn calculator — Gist Yarn. Planning inputs and sample-dependent allowances.
2. How to calculate take-up and shrinkage — Christine Jablonski / Gist Yarn. Measured starting-to-finished ratios.
3. Project planning worksheet tips — Liz Gipson / Yarnworker. End counts, repeat adjustments, yarn quantities, and weaving workflow.
4. Reed substitution chart — Schacht Spindle Company. Ends-per-dent arithmetic and the 20 EPI / 12-dent example.
5. SI units: length — National Institute of Standards and Technology. Exact inch, yard, and metric definitions.

What is original

The interface, software, worked scenarios, worksheets, allocation algorithm, and explanatory copy are original. No paid patterns or proprietary yarn databases are included. Basic arithmetic is independently derived, with definitions documented on the methodology page.

Sources differ in how they use “take-up,” “shrinkage,” and “allowance.” Read the denominator beside each input when transferring a percentage from another worksheet.