01 / METHOD
How to use this calculator
- Measure the total finished width the treatment must cover.
- Choose the construction fullness ratio.
- Enter the side hem used on both sides of every panel.
- Divide the total flat width across the stated panel count.
02 / APPLICATION
Useful for
- Gathered curtains and skirts
- Simple knife-pleat planning
- Comparing fullness options
03 / BOUNDARIES
Assumptions and limitations
What the estimate assumes
- Fullness is expressed as flat fabric width divided by finished coverage.
- Each panel has two equal side hems.
What it does not model
- Specific pleat spacing, return, overlap, pattern matching, and seam joins need separate planning.
- Finished fullness can vary with fabric behavior and heading construction.
04 / NOTES
Frequently asked questions
What does 2× fullness mean?
The pleated or gathered portion starts with twice the finished coverage width, before hems.
Are panel joins included?
No. Add any joining seam allowances separately when multiple widths are seamed.