Measure the outside of the finished quilt top, then use the cut strip width specified by your binding method. This calculator keeps the required binding length separate from the fabric length used to cut those strips. A 2.5-inch cut strip is not a promise of a 2.5-inch finished binding.
At the cutting table
Crosswise binding strip calculator
Calculate straight, crosswise strips from the actual quilt dimensions and the cut strip width in your binding instructions.
Example: a 60 × 80 in quilt has 280 in of perimeter before end or join allowances. Numbers shown are editable examples. Your entries stay in this page.
Enter your measurements to calculate.
What is included in the answer
For a rectangle, perimeter is 2 × (width + length). Add the total end and handling allowance your method requires. If each strip has usable length W and every join consumes J, N strips supply N × W − (N − 1) × J. The calculator chooses the smallest whole N that reaches the required binding length. The fabric length across which to cut those strips is N × cut strip width.
For the editable example, a 60 × 80-inch top has 280 inches of perimeter. Add 12 inches at the ends to require 292. Seven 42-inch strips with 2.5 inches lost per join supply only 279 inches, so eight strips are needed. They supply 318.5 inches and occupy 20 inches of fabric length when the cut width is 2.5 inches. That is 0.5556 yards, rounded upward to 0.625 yards at a 1/8-yard purchase increment. These allowance values are examples, not a universal binding recipe.
Enter the join method you will use
The tool accepts a length loss per join rather than quietly assuming one type of seam. A diagonal join and a straight join can consume different amounts. Confirm your actual construction instructions or measure the loss on a scrap join. Use usable width after selvages and treatment. Add separate room for squaring, faults or a print repeat if needed.
This is a straight crosswise strip model. It does not calculate continuous bias binding, stretch around curves, miters, fold thickness, machine attachment clearance or a finished binding width. American Patchwork & Quilting’s Plaid Stars instructions illustrate the distinction between a finished quilt size and explicitly stated crosswise cut strips. Their project quantities are not general recommendations for your quilt.
Plan the other fabric separately
Use the backing panel worksheet for the back and operator overhang, or the rectangular cutting planner for multiple separate cuts. Binding fabric is additional unless your pattern explicitly supplies it from leftover pieces.
Method and sources
The formulas and numeric scenario are original perimeter and strip-joining arithmetic, not a sewing test. Primary project example checked October 15, 2026: Plaid Stars Wall Quilt, American Patchwork & Quilting . Use your exact binding method for allowances and cut width.