Quilt Binding Calculator - Calculate Strips, Yardage, and Bias Area

A quilt binding calculator is a sewing tool that turns the size of your finished quilt into the exact length, strip count, and yardage of binding you need. Every quilt needs a binding strip to cover the raw edges of the quilt sandwich, and the right amount depends on the perimeter, the binding type, and the fabric width. Running the numbers before shopping keeps you from buying too little or too much.

• • Finishing a Pieced Quilt Top: Plan the final step of any pieced quilt by calculating binding fabric yardage after the layers have been basted together.
• • Prepping a Wall Hanging or Mini Quilt: Mini quilts and table runners use the same perimeter-plus-overage rule, but small miscalculations leave a noticeable gap at the join.
• • Buying Coordinating Binding for a Gift Quilt: Estimate yardage for a solid or tonal binding before committing to a fabric, so the binding cost and color can be balanced against the rest of the quilt budget.

Quilters measure quilt width and length, decide on a binding strip width, and then need to know how many strips to cut and how much yardage to buy. Doing the math by hand is straightforward, but a calculator handles the ceil function for partial strips and keeps the joining overage in one place.

Once the binding is planned, the backing and batting for the same quilt can be sized in parallel using the quilt calculator in the same category.

The calculator combines a simple perimeter calculation with the standard 10-inch joining overage quilters use, then divides by the fabric width to count the strips you will cut.

• Quilt Width: The finished width of the quilt top in inches, measured after borders are attached.
• Quilt Length: The finished length of the quilt top in inches, measured after borders are attached.
• Strip Width: The cut width of each binding strip before it is folded. Most quilters choose 2 to 2.5 inches for a standard double-fold binding.
• Fabric Width: The dimension of the fabric edge along which the strips will be cut, typically 42 to 45 inches for quilting cotton.
• Waste Factor: A percentage of extra binding added to cover mis-cuts, mitered corners that are re-sewn, and small piecing mistakes.

The 10-inch joining overage is the industry standard for quilters. It covers about 8 inches for joining the strips into one long tape and about 2 inches for the final angled join that closes the loop around the quilt.

For straight-grain binding, strips are cut perpendicular to the fabric selvedge so the binding has minimal stretch. The waste factor sits on top of the standard overage so you do not run out if a corner needs to be re-stitched.

According to Missouri Star Quilt Company, the binding tape length for a finished quilt is the quilt perimeter plus about 10 inches of joining overage, and the number of straight-grain binding strips equals the binding length divided by the usable fabric width along which the strips will be cut.

These four concepts come up every time you finish a quilt, and each one changes the math or the final look of the binding.

Pick cross-grain binding for most quilts with square corners, and switch to bias only when the quilt has curved edges, inset circles, or scalloped borders where straight strips would pucker.

Cross-stitch projects use a similar concept of counting fabric against a stitched grid, so the cross-stitch calculator plans a finished piece the same way.

Measure the finished quilt top, choose a binding type, and let the calculator convert those numbers into a cut list and a fabric yardage figure.

1. 1 Measure the Quilt Top: Measure the finished width and length of the quilt top in inches, after all borders and sashing are attached. These are the numbers you enter into the calculator.
2. 2 Pick a Binding Type: Choose straight binding for square corners and most quilts. Choose bias binding if the quilt has curved edges, scallops, or inset circles.
3. 3 Set the Strip Width: Enter the cut width of each binding strip, typically 2 to 2.5 inches for a standard double-fold binding that shows about 3/8 to 1/2 inch on the front of the quilt.
4. 4 Enter the Fabric Edge Length: For straight binding, enter the fabric width perpendicular to the strips (usually 42 or 45 inches). For bias binding, enter the shorter edge of the fabric piece you plan to cut from.
5. 5 Read the Cut List and Yardage: Use the strip count and fabric length to plan your cuts, and add the area or square side if you are working with a bias binding layout.

For a 50 by 70 inch lap quilt using 2.25-inch straight-grain strips from 45-inch fabric with 5 percent waste, the calculator returns a 240 inch perimeter, a 262.5 inch working length, 6 strips, and 0.38 yards of fabric.

Before measuring the finished quilt for binding, plan the pieced top so the dimensions match what you will actually bind, and the half-square-triangle calculator helps you size those blocks first.

A quilt binding calculator removes the math and the second-guessing from finishing a quilt, so you can focus on the sewing.

• • Buy the Right Amount the First Time: Stop guessing how much binding fabric to add to your cart. The calculator gives you a whole-strip count and a yardage figure that includes a waste margin.
• • Avoid Mid-Project Shortages: Running out of binding halfway around the quilt means a trip back to the store, often for a slightly different dye lot. Planning ahead with the calculator prevents that interruption.
• • Compare Binding Types Side by Side: Switch between straight and bias binding to see the fabric impact. Bias binding takes more fabric but is worth it for curved edges.
• • Coordinate With the Rest of the Quilt: Pair the binding yardage with the backing and batting figures from the quilt-calculator in the same category to plan the whole project in one sitting.

The same numbers help when you are choosing between a pieced binding made from scraps and a continuous bias binding from a single piece. Pieced binding needs more strips and a longer waste margin, while continuous bias needs more upfront fabric but produces a smoother color flow around the quilt.

If you are also planning a coordinating tote or accessories from the same fabric, the fabric calculator sizes yardage for matching pattern pieces, so the binding and the accessories can be cut from a single bolt without a second dye lot.

A few variables change the final number, and knowing them up front keeps your finished binding looking the way you planned.

• • The calculator assumes a rectangular quilt. For circular, hexagonal, or scalloped quilts, multiply the perimeter you measure by hand by the same 1.10 overage factor to estimate binding length.
• • Strip counts and yardage do not include the extra selvedge trim or the small offcuts from squaring up the fabric. Buy at least an extra inch of usable length beyond the calculator's number if you are pre-washing yardage.

The calculator uses 2.5 inches as a sensible default for the standard double-fold binding that most quilters reach for first, with a folded finished width of about 3/8 to 1/2 inch on each side of the quilt.

As described in the Wikipedia Bias tape article, double-fold bias tape is a fabric strip cut on the bias with each raw edge pressed under and then folded in half lengthwise, which is the same construction most quilters use to finish the raw edges of a quilt.

If you are cutting bias strips from a non-square piece of fabric, the circle-skirt calculator uses the same area-then-side math for sizing a bias fabric piece, since a full or half circle skirt also needs bias-friendly curved yardage from a non-square cut.