Quilt Binding Calculator
Find the total binding length, number of cross-grain strips and fabric yardage to bind a quilt of any size.
How it works
Perimeter = 2 × (width + height) · Binding length = perimeter + 10 in · Strips = ⌈length ÷ fabric width⌉ · Yardage = strips × strip width ÷ 36
Binding is cut in strips across the fabric width and joined end to end into one long band folded around the quilt edge. The extra 10 inches covers the four mitered corners and the diagonal seams where strips meet, plus a little tail for closing the loop. Double-fold (French) binding is cut 2.25–2.5 inches wide so it folds to a finished width of roughly three-eighths of an inch on each side.
Worked example
For a 60×80 in quilt the perimeter is 2 × (60 + 80) = 280 in; adding 10 in gives 290 in of binding. At a 42 in usable width you need ⌈290 ÷ 42⌉ = 7 strips. Cut 2.5 in wide, that is 7 × 2.5 = 17.5 in down the bolt, about 0.49 yd.
Frequently asked questions
Should binding be cut on the straight grain or the bias?
For a quilt with straight edges, cross-grain (selvage-to-selvage) strips are standard and use the least fabric. Cut binding on the bias only when the edge is curved or scalloped, since bias stretches to follow the curve — but it needs noticeably more fabric.
How wide should I cut binding strips?
For double-fold binding on cotton batting, 2.25 in gives a snug finish and 2.5 in a slightly fuller edge. Thicker battings or flannel back better with 2.5 in. This calculator lets you set the width so the yardage matches your choice.
Why add 10 inches to the perimeter?
Each mitered corner consumes a little length, the diagonal seams that join strips overlap, and you need a tail to close the binding loop neatly. Ten inches is a safe, commonly used allowance for a bed-size quilt.
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This calculator is for educational purposes. Double-check important results before acting on them.