Curtain panel width calculator — readable saved URL guide
Page: https://www.lejnel.com/tools/curtain-width/
Query key: curtain, containing percent-encoded JSON. Version v must be 1.
track: covered track/pole width in mm, 1–30000.
panel: usable finished flat width of ONE panel before gathering, mm, 1–30000.
fullness: chosen flat-width/covered-width ratio, 1–5.
sides: 1 for one group, 2 for balanced groups (equal whole panels each side).
pack: integer panels per retail pack, 1–100.
All fields required, finite numbers. Canonical dimensions remain metric even with imperial display.
Ask for missing values; do not invent product fullness or measurement requirements.
Use the manufacturer's heading guidance. This is not a sewing, drop, load or stack-back planner.
Rounding: ceil(target width / sides / panel) per group, then multiply by sides; round panels to packs. Unused pack panels do not count toward hanging fullness.
The following defaults are illustrative only.
JSON: {"v": 1, "track": 2000, "fullness": 2, "panel": 1400, "sides": 2, "pack": 2}
Example: https://www.lejnel.com/tools/curtain-width/?curtain=%7B%22v%22%3A1%2C%22track%22%3A2000%2C%22fullness%22%3A2%2C%22panel%22%3A1400%2C%22sides%22%3A2%2C%22pack%22%3A2%7D