Binding Calculator
Calculate the number of binding strips and fabric yardage needed to bind your quilt based on perimeter, binding width, and fabric width.
About this calculator
Binding wraps the raw edge of a finished quilt, and this calculator works out how many fabric strips you need to cut and how much yardage that requires. It adds 12 inches to your quilt perimeter to cover mitered corners, then divides that total by your usable fabric width to find how many strips must be cut and joined end to end. Strips-needed responds to quilt perimeter and fabric width in roughly equal measure -- a longer perimeter needs more strips, while wider usable fabric lets each strip cover more distance and reduces the number needed -- but binding strip width has no effect on strip count at all, since count is about total length covered, not how wide each strip is cut.
Strip width instead drives fabric yardage directly: a wider binding strip uses more fabric per strip even though the same number of strips are cut. The calculator also estimates bias binding yardage (cut at 45 degrees rather than straight grain) at roughly 1.4x the straight-grain amount, since diagonal cuts waste more fabric between strips. What this does not account for: seam allowance lost when joining strips together, which typically adds a small amount to real-world yardage beyond this estimate.
Inputs
Results
Binding Strips Needed
7
Fabric Yards (straight grain)
0.49 yd
≈ 5 credit cards
How to Use This Calculator
- Enter Quilt Perimeter, Binding Strip Width, and Fabric Width.
- Review Binding Strips Needed and Fabric Yards (straight grain) (yd).
- Use Fabric Yards (bias binding) (yd) and Total Binding Length to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
How the result changes with Quilt Perimeter
| Quilt Perimeter | Binding Strips Needed | Fabric Yards (straight grain) |
|---|---|---|
| 140 | 4 | 0.28 yd |
| 210 | 6 | 0.42 yd |
| 420 | 11 | 0.77 yd |
| 600 | 15 | 1.05 yd |
What each input means
- Quilt Perimeter
- Total perimeter of the quilt in inches. Add width + length, multiply by 2.
- Binding Strip Width
- Cut width of each binding strip in inches. 2.5 inches is standard for double-fold binding.
- Fabric Width
- Usable width of your fabric in inches.
How this is calculated
Worked example, using the default values
- Identify Input ParametersQuilt Perimeter = 280, Binding Strip Width = 2.5, Fabric Width = 42 = 3 input(s) provided
- Calculate Binding Strips NeededBinding Strips Needed7 = 7
- Calculate Fabric YardsFabric Yards0.49 = 0.49
- Calculate Bias Binding Fabric YardsBias Binding Fabric Yards0.69 = 0.69
- Calculate Total Binding LengthTotal Binding Length292 = 292
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does binding strip width not change how many strips I need?
Strips needed is determined purely by total binding length (quilt perimeter plus a 12-inch corner allowance) divided by fabric width -- it's a question of how many fabric-width-long strips it takes to cover that length, which has nothing to do with how wide each strip is cut. Strip width only affects fabric yardage, since a wider strip consumes more fabric per strip cut.
Why add 12 inches to the quilt perimeter for binding length?
The 12-inch addition covers the extra binding used at mitered corners -- when binding turns a 90-degree corner, folding it neatly uses more binding length than the straight perimeter measurement alone would suggest. Without that allowance, you'd come up short right at the corners, the most visible and structurally important part of the binding.
How much more fabric does bias binding use compared to straight grain?
The calculator estimates bias binding at roughly 1.4 times the straight-grain yardage, because cutting strips at a 45-degree angle across the fabric wastes more material between cuts than cutting straight along the grain. Bias binding is worth the extra fabric on curved edges, since it stretches to follow curves without puckering the way straight-grain binding does.
If I use wider fabric, will I need fewer binding strips?
Yes -- wider usable fabric means each strip you cut across it covers more of the total binding length needed, so fewer strips are required to reach the same total. This calculator's fabric width input responds in the opposite direction from quilt perimeter: a larger perimeter increases strips needed, while wider fabric decreases it.
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