Add each window that needs curtains. Panel counts and fabric yardage are calculated per window using interior design conventions, then totaled across every window in the list.

Add Window

Unit system Imperial (inches) Metric (centimeters)

Rod extension per side
Mount above frame

Single panel width
Hem and header allowance

Pattern repeat (0 for plain fabric)
Fullness override (0 to use header style)

Cost basis Per yard or meter of fabric Per finished panel
Currency symbol

Show step-by-step formulas