Continuous bias binding fabric calculator
Estimate square fabric area for a required length of cut-width bias binding.
Your measurements
01 / INPUTUse the units shown beside each field. Whole counts must be whole numbers.
Your result
02 / PLANNo saved baseline.
What changes when…
Baseline comparison
Save a baseline, then change your inputs. The difference is current minus baseline. Saved values stay in this browser.
| Result | Baseline | Current | Difference |
|---|
Use the result
Measure the project perimeter and add joins and tails first, then calculate fabric from the full required strip length.
Assumptions that matter
- Enter cut width, before folds. Finished binding width is a different measurement.
- Area equivalence is an estimate; joins, diagonal layout and edge losses affect practical yield.
- A square gives an approximate continuous-bias starting size; round upward for cutting.
- Check whether your project uses single-fold, double-fold or quilt binding before choosing width.
Common questions
How is the result calculated?
The formula reference shows every equation and defines the input variables. Whole-item results explicitly round to whole quantities where needed.
How should I use the example?
The initial numbers are a worked example. Replace them with measurements from your own project before making a plan. Three calculated scenarios appear on the examples page.
Can I compare two plans?
Yes. Save a baseline, change one or more inputs, and compare the result table. The chart changes only one input at a time.
Does this upload my measurements?
No. Calculations run in this browser. Saving a baseline uses local browser storage; the scenario-link button includes entered numbers in a URL fragment you choose to share.
Need a paper record? Use the measurement worksheet.