Calculate binding strip yardage, number of strips, and total length for quilt binding. Supports single-fold, double-fold, and bias binding.
Quilt binding is the final step that finishes the raw edges of your quilt, and getting the right amount of binding strips is essential. Cut too few strips and you're back at the cutting table mid-sewing. Cut too many and you waste premium fabric. This calculator determines exactly how many strips to cut, from how much fabric, and in what width.
Binding comes in several styles: double-fold (most common — strips folded in half, then folded over the quilt edge), single-fold (one fold, thinner finish), and bias binding (cut on the 45° diagonal for curves and scalloped edges). Each style requires different strip widths and yardage. Double-fold binding at 2.5" wide is the quilting standard, but this tool lets you customize for any width.
The calculator accounts for quilt perimeter, extra length for mitered corners (typically 10-12 inches total), seam allowances for joining strips, and the diagonal seams used to connect binding strips end-to-end. It generates a complete cutting plan including how many strips from your fabric width and total yardage needed.
It gives you a clear strip count and yardage estimate before you start cutting, which is much better than discovering you are short when the quilt is already assembled and trimmed. It also helps you compare straight-grain and bias-binding plans before you cut into your fabric. That matters when corners, curves, or stripe direction make one binding approach more practical than another.
Perimeter = 2 × (width + height). Total binding = perimeter + extra for corners + seam overlap. Strips from 42" fabric width = 42" ÷ strip width (for straight-grain). Strips needed = total binding length ÷ usable strip length. Yardage = strips needed × strip width ÷ 36. Bias strips: usable length per strip = 42" × √2 ≈ 59.4" (diagonal of fabric).
Result: 292" binding needed, 7 strips from 42" fabric, 0.55 yards
Perimeter = 2×(60+80) = 280". Add 12" for mitered corners = 292". Each 42" strip provides ~42" of binding. 292÷42 = 7 strips. 7 strips × 2.5" wide = 17.5" of fabric = 0.49 yards + waste = ~0.55 yards.
Most binding estimates begin with the quilt perimeter, then add extra allowance for corners, joining the tails, and a bit of handling margin. That extra length matters because the last join can eat more binding than expected, especially with wider strips or bulky fabrics.
Straight-grain binding is the efficient choice for square quilts with straight edges. Bias binding uses more fabric but flexes around curves and scallops much better because the fibers sit on the diagonal. The calculator helps you plan either route without having to sketch strip math on paper first.
A wider strip makes binding easier to manipulate and gives you more room to catch the back in machine stitching. Narrower strips create a slimmer finish but leave less tolerance for seam allowance drift. If you are testing a new width, cut one sample strip and wrap a practice edge before cutting the full set.
For double-fold binding (most common): 2.25" to 2.5" wide. For single-fold: 1.25" to 1.5". Wider strips (2.5") are easier to work with, especially for beginners. Narrower (2.25") gives a slimmer finish.
Straight-grain (cut along the fabric grain) works for straight-edged quilts and is more fabric-efficient. Bias binding (cut at 45°) is necessary for curved edges, scalloped borders, and rounded corners. Bias also drapes better.
Join strips with a diagonal (45°) seam: place two strips right sides together at a right angle, sew diagonally from corner to corner, trim 1/4" from the seam, and press open. This distributes bulk and is less visible than a straight seam.
Add 10-12 inches total for four mitered corners (about 2.5-3" per corner). If you're a beginner, add 15-20" to have working room. It's better to have extra than to run short with 6 inches to go.
Yes, this is a common choice for a coordinated look. Calculate your backing yardage first, then add the binding yardage on top. Some quilters cut binding strips from the backing fabric before cutting backing panels.
Machine binding is faster — sew to the front, fold to the back, and stitch in the ditch. Hand binding gives a cleaner invisible finish on the back. The yardage calculation is the same for both methods.