Quilt Border Calculator
Zero Waste & No Sign-up: Calculate fabric yardage and strip lengths for quilt borders. Supports single and multiple borders with mitered or butted corner options.
How to Use the Border Calculator
Enter the quilt center dimensions and the finished width of each border, working from the innermost outward — the calculator grows the quilt by twice the border width after each round, so every subsequent border is measured against the enlarged top.
For each border, strips are cut half an inch wider than the finished width to cover both seam allowances. The strip length requirement totals two times the current width plus two times the current height, plus eight times the border width as a corner and joining margin, and the tool divides that by a 40-inch usable fabric width to get the strip count.
Yardage per border is the strip count times the cut width, rounded up to the next eighth of a yard, and the grand total rounds up once more. As a worked example, a single 3-inch border on a 60 x 80 inch quilt needs 304 linear inches, eight strips, and about 7/8 yard of fabric. If the border shares fabric with the blocks, cut the long border strips first — full-length strips must come off the yardage before it is cut into small pieces.
Frequently Asked Questions
How do I calculate yardage for a quilt border?
Measure the total length of all border strips needed, add seam allowances, and divide by the usable fabric width. Our calculator handles this automatically.
What is the difference between mitered and butted corners?
Butted corners are sewn straight across where borders meet. Mitered corners are cut at a 45-degree angle for a picture-frame look. Mitered corners use slightly more fabric.
How wide should my quilt border be?
A common guideline is to make the border width proportional to the block size — roughly 1/4 to 1/3 of the block size. Multiple borders in varying widths create a dynamic frame.