Curtain Fabric Pattern Repeat Calculator
Work out curtain yardage when a patterned fabric must repeat and match across every drop.
How it works
Widths = ⌈window × fullness ÷ fabric width⌉ · Cut length = ⌈(drop + allowance) ÷ repeat⌉ × repeat · Yardage = widths × cut length ÷ 36
Patterned curtains have to match motif-to-motif across every panel, so each drop is cut to a whole number of pattern repeats rather than its bare finished length. That rounding is pure waste on the offcut, and it happens once per width — which is why a big repeat on a wide window can add a surprising amount of fabric. Set the repeat to zero for a plain fabric and the calculator simply adds your hem and heading allowance.
Worked example
A 60 in window at 2× fullness on 54 in fabric needs ⌈120 ÷ 54⌉ = 3 widths. A finished 84 in drop plus 16 in of hems and heading is 100 in; rounded up to the next 18 in repeat that becomes 108 in per drop. Three drops × 108 in = 324 in, about 9 yd.
Frequently asked questions
What is a pattern repeat and where do I find it?
The repeat is the vertical distance before the printed or woven motif starts over. It is usually listed on the fabric bolt or the retailer’s spec; measure it yourself by finding one point on the design and the identical point directly above it.
What fullness ratio should I use?
For pinch-pleat or wave headings 2 to 2.5 times the track width gives a rich gather; pencil pleats work at about 2×; a simple rod-pocket casual look can drop to 1.5×. Sheers are often gathered 2.5–3× for body.
Does the repeat affect plain fabric?
No. With no repeat there is nothing to match, so each drop is cut to exactly the finished length plus hem and heading allowance. Enter 0 for the repeat and the waste disappears.
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This calculator is for educational purposes. Double-check important results before acting on them.