Quilt Binding Calculator
Calculate binding strips and total fabric yardage needed from your quilt's dimensions.
Reviewed by the ToolNestr Editorial Team — July 2026
How quilt binding is calculated
Binding needs to wrap the entire perimeter of the quilt, so the calculator starts with 2 × (length + width), then adds a standard allowance (about 10-15 inches) for the diagonal seams that join binding strips end to end and for turning mitered corners cleanly, both of which use slightly more fabric than the flat perimeter measurement alone.
That total binding length is then divided by your usable fabric width to find how many strips need to be cut, and the number of strips multiplied by your chosen strip width gives the total fabric needed, converted to yards.
This follows the standard perimeter-plus-allowance method used across quilting references for straight-grain, continuous double-fold binding.
Worked example
A 90 × 66 inch quilt, 2.5-inch binding strips, cut from 40-inch-usable-width fabric.
Real-world context
Running short on binding fabric right at the final step of a quilt is a uniquely frustrating problem, since binding is usually the very last thing sewn after weeks or months of piecing and quilting — calculating the exact number of strips needed before cutting avoids discovering a shortfall when the project is otherwise finished.
Scrap-binding quilts, where the binding is pieced from many different leftover fabrics rather than one yardage cut, still benefit from this perimeter math — knowing the total binding length needed tells you how many scrap strips of varying length you need to piece together to reach that total.
Common misconceptions
"Binding length equals the quilt perimeter exactly." Slightly more is needed. Mitered corners and the diagonal joining seams between strips both consume extra length beyond the flat perimeter measurement, which is why the standard allowance exists.
"Wider binding strips always look better." Depends on the quilt. A binding strip that's too wide relative to the quilt's batting thickness can look bulky or uneven; strip width should be chosen to match batting loft, not just personal preference for a bigger border.
Related tools
Frequently asked questions
What binding strip width should I use?
A 2.5-inch strip width is the most common choice for standard double-fold binding on a quilt with typical batting thickness; use a narrower 2-inch strip for a thinner finished binding, or wider (2.75-3 inches) for thicker batting.
Why does the calculator add extra to the perimeter?
Mitered corners and the diagonal seam used to join binding strips into one continuous length both consume a bit more fabric than the quilt's exact perimeter, so a standard allowance (about 10-15 inches) is added to avoid running short at the very end.
How wide is the usable strip length from my fabric?
This depends on your fabric's width minus a small trim allowance for the selvage edges — this calculator assumes a standard 40-inch usable width from a typical 42-44 inch quilting cotton bolt, which you can adjust.
Should I cut strips on the straight grain or the bias?
Straight-grain strips are standard for most quilts with straight edges; bias-cut binding is used for quilts with curved edges since it stretches to follow curves, but bias binding uses noticeably more fabric for the same finished length.