What this workbench does
Estimate square fabric area for a required length of cut-width bias binding.
It combines an editable calculator, baseline comparison, one-input sensitivity chart, transparent formulas, worked examples and a printable measurement sheet.
How to assess the result
Measure the project perimeter and add joins and tails first, then calculate fabric from the full required strip length.
The calculations implement the stated geometric or arithmetic model. They are estimates where real materials, equipment or processes differ from that model. The specific assumptions are listed on the calculator and reference pages.
Version
Workbench release 1.0 · 3 November 2026. Calculated examples and shared numeric engine checked automatically. Real-world project performance has not been independently certified.