Ruffle gather ratio fabric calculator
Plan a gathered strip with seams, joins and a chosen fullness ratio.
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
Gather a short sample onto a measured edge and choose the ratio by appearance before calculating the full project.
Assumptions that matter
- A ratio of 2 means two units of flat strip for one unit of finished edge.
- Lightweight and heavy fabrics produce different visual fullness at the same ratio.
- Height allowance must include your seam and hem or double-layer construction.
- This assumes the ruffle strips may be joined across fabric widths.
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.