Binding needs the quilt's perimeter plus 10″ for corners and joins, cut in strips across the width of fabric. Pick the quilt size and strip width to see strips to cut and yardage to buy.
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Binding formula
Strips = (perimeter + 10″) ÷ usable fabric width, rounded up. Yardage = strips × strip width ÷ 36, rounded up to 1/8 yd. Use 2 1/4″ for thin batting and single-fold, 2 1/2″ is the common double-fold choice.