How Much Binding for a Full Quilt?

Eighty-four inches of width is what makes a full quilt awkward. The top is wider than two panels of backing, and the binding travels 348 inches around the edge before you allow for a single corner. For a standard 84 by 90 inch full quilt, cut 9 strips at 2.5 inches and buy 3/4 yard. Here is the math behind that, and where it stops holding.

The Binding Math for an 84 by 90 Full Quilt

Perimeter first: (84 + 90) × 2 = 348 inches. Then the joining allowance. Twenty-four inches is the honest figure rather than twelve, because the diagonal seam where the two ends meet eats 10 to 12 inches and four mitred corners pull 2 to 3 inches each. That gives 372 inches of binding. Divide by 42 inches of usable width and round up: 372 ÷ 42 = 8.86, so cut 9 strips. Nine strips at 2.5 inches is 22.5 inches of fabric, exactly 5/8 yard. With no room for error at 5/8, buy 3/4 yard.

Full Quilt Sizes and Their Strip Counts

A full quilt is not one number: drop at the sides and foot moves it by a foot either way.

Four of the five sizes share one 3/4 yard cut, and the two largest differ by a strip without costing more. Only 72 by 84 fits inside 5/8 yard.

Strip Width and the 3/4 Yard Ceiling

Strip width never changes the strip count at this size, only how much of the 27 inches in a 3/4 yard cut you use.

Three inch binding is where it breaks. Nine strips at 3 inches use exactly 27 inches, the whole length of the cut, so a shop that cuts half an inch shy leaves you short. Buy 7/8 yard for a 3 inch finish and keep 2.5 inches for everything else.

Borders and the Ten-Strip Ceiling

Nine strips carry 9 × 42 = 378 inches, which after the 24 inch allowance covers any quilt whose width plus length is 177 inches or less. The standard full sits at 174, three inches under. A 2 inch border makes the top 88 by 94, or 182, so the count moves to 10 strips. Those 10 use 25 inches and still fit inside 3/4 yard, so the border costs cutting time rather than fabric. Ten strips top out at 198: 96 by 102 is a full with a 6 inch border on every side, exactly at the limit. An 8 inch border gives 100 by 106 and 11 strips at 27.5 inches, so the purchase climbs to 7/8 yard.

Bias Binding and Scrappy Strips

Straight grain is right on a rectangular full quilt. For a scalloped edge, a 42 inch width yields about 29.7 inches of bias strip, so 372 ÷ 29.7 = 12.5 and you cut 13 strips. That is 32.5 inches, roughly 0.9 yard, so budget a full yard. One fat quarter cannot bind a full quilt, but three can: each 18 by 22 inch quarter gives seven strips of 22 inches, 154 inches in all, and three total 462. Joining 17 of those short strips end to end reaches 372.

Frequently Asked Questions