Free calculator · widths, drops & repeats
Enter the rod width, the drop and your fabric. Get the number of fabric widths, the cut drop rounded to the pattern repeat and the total to buy.
| Panel width | 40" |
|---|---|
| Flat width (× 2×) | 86" |
| Usable fabric width | 53" |
| Seams per panel | 1 |
| Total length | 392" |
Each width is cut at the cut drop and joined side by side.
How it works
Measure the rod width and the drop from the rod to where the hem should fall.
Add the fabric width, the fullness and the pattern repeat if there is one.
Buy the total, then cut each width at the cut drop, starting at the same point in the pattern.
Worked example
Worked example
Result
With a 25 1⁄4" pattern repeat the cut drop grows to 101" (4 repeats) and you buy 12 yd (11.0 m). In metric: 10.0 m (11 yd).
The math
The cut drop is the drop plus header and hem, rounded up to whole repeats. The total is widths × cut drop, plus one repeat to line up the first cut.
Panel: 80" ÷ 2 = 40". Flat: 40" × 2× + 6" = 86". Widths: 86" ÷ 53" → 2 per panel, 4 total. Cut drop: 84" + 6" + 8" = 98". Total: 4 × 98" = 392".
Tips
Measure the drop at both ends and the middle of the window. Floors and sills are rarely level.
Start every width at the same motif, so the pattern runs straight across the joined panel.
Linings use the same widths but usually no repeat. Run the calculator again with the repeat set to 0.
For pinch or box pleats with a printed ruler, use the curtain pleat calculator.
1.5× looks tailored, 2× is standard, 2.5–3× looks rich. Sheers often take 2.5× or more.
It is the length after which the print starts again. Each cut drop is rounded up to whole repeats so the panels match.
Your first cut rarely starts exactly at a motif. One extra repeat lets you line up the first width.
We start with 6" for the header and 8" for a double hem. Change both to suit your tape and style.
Yes. Set panels to 1 and fullness to 1 for a flat blind, or any fullness for a single curtain.
Free, private and instant. Your numbers never leave this page.
