Binding is the final frame around your quilt, and running short mid-project is a classic frustration. Plug in your finished quilt size below and this calculator tells you exactly how many strips to cut and how much fabric to buy — no graph paper required.
How quilt binding yardage is calculated
Binding wraps the entire outer edge of the quilt, so the math starts with the perimeter — the distance all the way around. From there we add a little insurance for turning corners and joining strips, work out how many fabric-width strips you can cut, and convert that to yardage.
Here is the exact formula this calculator uses:
- Perimeter = 2 × (width + height)
- Total binding length = perimeter + 10" (for mitered corners and diagonal joining seams)
- Strips needed = total binding length ÷ usable fabric width, rounded up
- Fabric inches needed = strips needed × strip width
- Yardage = fabric inches ÷ 36, rounded up to the nearest 1/8 yard
For example, a 60" × 72" quilt has a perimeter of 264". Add 10" and you need 274" of binding. With 42"-wide fabric that is 7 strips. At 2.5" each, that is 17.5" of fabric, or just under 1/2 yard once rounded up to the nearest eighth.
What is double-fold binding?
Double-fold (also called French-fold) binding is the most popular finish for quilts because it puts two layers of fabric along the wear-prone edge. You cut strips, join them end to end on the diagonal, then press the long strip in half lengthwise. The folded strip is stitched to the quilt front, wrapped around the raw edge, and finished on the back.
Because the strip is folded in half, a 2.5" cut strip finishes at roughly 1/4" of visible binding on each side. That is why this calculator multiplies the number of strips by the full cut width — you need the entire width even though only part of it shows.
Pro tip: Always join binding strips with diagonal seams. They distribute the bulk so the binding lies flat and the seams disappear into the edge of the quilt.
Tips for buying binding fabric
- Round up generously. This calculator already rounds yardage up, but buying an extra 1/8 yard gives you room for a test corner or a mistake.
- Bind after quilting. Quilts can grow or shrink slightly during quilting, so measure the finished top before cutting binding.
- Mind the fabric width. Quilting cotton is often sold at 42–44", but usable width after removing selvages is closer to 40–42". Enter the usable width for the most accurate result.
- Bias for curves. If your quilt has scalloped or rounded edges, cut bias strips instead — they stretch smoothly around curves.
Let Quiltler 3 do it for you: Instead of binding math in isolation, Quiltler 3 calculates binding, backing, batting, and every block fabric automatically for your full quilt design — then exports a PDF cutting guide. See the all-in-one fabric calculator or learn the technique in our guide to binding a quilt.