How much fabric do I need for quilt binding?

Binding yardage depends on your quilt's perimeter, not its area, so it's usually a fraction of a yard even for large quilts. A queen size quilt (90x90 inches) typically needs about 3/4 yard of fabric for standard 2.5 inch double-fold binding, cut from 44 inch wide fabric.

How Much Fabric for Quilt Binding?

Binding is one of the few parts of a quilt where the fabric math runs on perimeter, not area, which is why it usually only takes a fraction of a yard even on a large quilt. A queen size quilt (90″ × 90″) needs about 3/4 yard for standard double-fold binding. Run your exact quilt size through the quilt binding calculator to get a precise number.

How the math actually works

Binding wraps the outer edge of the finished quilt, so the starting point is the perimeter: twice the length plus twice the width. A bit of extra length gets added on top of that, commonly around 10″, to cover mitering the four corners and joining the strip ends together into one continuous loop.

That total length then gets divided into strips cut across the width of the fabric. Standard double-fold binding uses 2.5″ wide strips (some quilters prefer 2.25″ for a narrower finished edge), and each strip yields roughly 40″ of usable length once selvages are trimmed off a standard 44″ fabric bolt. The number of strips you need, times the strip width, is your total fabric length — which is almost always well under a yard's worth of width even though it might take several strips to get there.

Real examples across quilt sizes

All of these use the default 2.5″ strip width, 44″ fabric, and a 10″ joining allowance:

Throw (50″ × 65″): about 1/2 yard
Twin (70″ × 90″): about 3/4 yard
Queen (90″ × 90″): about 3/4 yard
King (108″ × 92″): about 1 yard

Twin and queen land on the same 3/4 yard here, not because they need the same amount of binding, queen's perimeter is genuinely longer, but because binding fabric is bought in quarter-yard increments and both totals round up into the same bracket. It's a good reminder that the calculator's output is always rounded up to a number you can actually buy at the store, not the raw decimal.

Why some quilters use more or less than the default allowance

The 10″ joining allowance is a common rule of thumb, not a fixed law. Quilters who miter corners more generously, or who prefer extra insurance against a short strip, often bump it up to 12″–15″. It rarely changes the final yardage by much since it's a small fraction of the total perimeter, but if you've run short on binding before, increasing the allowance in the calculator costs you very little extra fabric.