How binding is calculated
- Perimeter: 2 × (width + length) of the finished quilt.
- Add extra for mitered corners and for joining the two ends, typically 10–12".
- Divide by usable strip length. Strips are joined with diagonal seams, and each join uses up roughly one strip width, so the calculator counts each strip as (fabric width − strip width).
- Fabric = number of strips × strip width, rounded up to the next ⅛ yard.
Example
A 60" × 72" lap quilt has a 264" perimeter. With 12" extra that's 276" of binding. From 40" usable fabric, each 2½" strip contributes about 37½", so you need 8 strips: 20" of fabric, which rounds up to ⅝ yard.
Binding tips
- Double-fold binding cut at 2¼"–2½" is the most common for bed and lap quilts.
- Bias binding uses more fabric; only needed for curved or scalloped edges.
- Join strips with diagonal seams to spread the bulk.
Frequently asked questions
How many strips do I need for binding?
Divide the quilt perimeter plus about 12" by the usable length of each strip (fabric width minus the strip width for the diagonal join), then round up. Enter your quilt size above for an exact count.
How wide should I cut binding strips?
2½" is the most popular width for double-fold binding. 2¼" gives a narrower, tighter binding; thicker batting may need 2½" or more.
How much fabric do I need to bind a queen quilt?
A 90" × 108" quilt needs about 408" of binding, roughly 11–12 strips of 2½", so a little under 1 yard of fabric.