Quilt binding and border calculator
Strips are cut across the width of the fabric and joined end to end. Enter your quilt size to get the number of strips and how much fabric to buy.
Binding
Borders
How it is worked out
Binding: the perimeter (2 × width + 2 × length) plus the extra for corners gives the total length. Each strip gives the usable fabric width minus about one strip width, which is lost in the diagonal join. Strips = total ÷ length per strip, rounded up. Fabric = strips × strip width.
Butted borders: two side strips as long as the quilt, plus top and bottom strips as long as the quilt width plus both borders. Cut width = finished width + two seam allowances.
Frequently asked questions
How wide should I cut binding strips?
2½ inches is the most common width for a double-fold binding with a ¼ inch seam. Some quilters use 2¼ inches for a tighter binding or 2¾ inches for thicker batting.
How much extra binding do I need for corners and joins?
Add about 10 to 12 inches to the perimeter for mitred corners and for joining the ends. The calculator also allows for the length lost to each diagonal seam when strips are joined.
Why are borders measured through the middle of the quilt?
The edges of a quilt top stretch while you sew. Measuring through the centre and cutting borders to that length keeps the quilt square and stops wavy borders.
Does this work for mitred borders?
This calculator is for butted borders (sides first, then top and bottom). Mitred borders need each strip to be longer by about twice the border width plus a few inches.
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