Curtain Size Calculator
Calculate the total curtain fabric width and per-panel width needed for your window based on rod width and fullness.
Typically 2x-2.5x for standard fullness
Total Fabric Width
150.0 in
Per Panel
75.0 in
How to Calculate Curtain Fabric Width
Curtains need more fabric width than the rod or window itself so they hang with soft folds instead of lying flat. Multiply your rod width by a fullness ratio — typically 2x to 2.5x for standard fullness, or up to 3x for a very full, luxurious look — to get the total fabric width, then divide by the number of panels to size each one.
Example
For a 60" wide rod with standard 2.5x fullness, you need 60 × 2.5 = 150" of total fabric width. Split across 2 panels, each panel should be 150 ÷ 2 = 75" wide.
Common Use Cases
- Working out how wide to cut or order curtain fabric or ready-made panels for a window.
- Comparing how different fullness ratios change the amount of fabric needed.
- Sizing individual panels when splitting a rod width across two or more panels.
FAQs
What fullness ratio should I use?
A ratio of 2x to 2.5x gives a standard, well-draped look suitable for most rooms. Lightweight sheers often look best at 2.5x-3x fullness, while heavier fabrics like velvet can look full even at 2x since the material itself has more body.
Should I measure the rod width or the window width?
Use the rod width, not the window opening — curtain rods are usually mounted wider than the window frame so panels can fully clear the glass when open, and fabric width should be based on that actual mounted rod width.
Does this account for fabric needed for hems and seams?
No — this calculates the finished, hung width only. Add extra fabric on top of this result for side hems, center seams if joining fabric widths, and pattern repeat matching if using a patterned fabric.