A quilt binding calculator takes the guesswork out of finishing your quilt. Binding fabric is the last thing you want to run short on after completing a quilt top and backing. Enter your quilt dimensions, binding strip width, and fabric width below to instantly calculate total binding length, number of strips to cut, and total fabric yardage — for both straight grain and bias binding methods.
Quilt & Binding Details
Enter quilt dimensions and binding specifications
Most quilting cotton is 42–44 in wide after washing and removing selvage
Straight grain: strips cut parallel or perpendicular to selvage. Less waste, easiest for beginners.
Standard Quilt Size Reference
Approximate binding length for common quilt sizes (2.5 in strips, 42 in fabric)
| Quilt Size | Dimensions (in) | Binding Length | Fabric Needed |
|---|---|---|---|
| Baby | 36 × 52 | 188 in | ⅓ yd |
| Throw | 60 × 80 | 292 in | ½ yd |
| Twin | 65 × 85 | 312 in | ½ yd |
| Full | 80 × 95 | 362 in | ⅝ yd |
| Queen | 90 × 105 | 402 in | ¾ yd |
| King | 110 × 115 | 462 in | ¾ yd |
How to Use the Quilt Binding Calculator
The binding is the finishing touch on any quilt — the strip of fabric that wraps around all four edges and holds the quilt sandwich together. Getting the binding calculation right means you never run short on this final critical step. This quilt binding calculator computes the total binding length, the number of strips to cut, and the exact fabric yardage you need, for both straight grain and bias binding.
Step 1: Enter your quilt dimensions and choose units
Toggle between inches and centimetres at the top of the calculator, then enter your finished quilt top width and length. Use the final measurement of the quilt top (after squaring up), not the backing or batting dimensions. The calculator automatically adds seam allowances and a joining buffer so your binding will have enough length.
Step 2: Set binding strip width and fabric width
The default binding strip width is 2.5 inches, which is the most common choice for double-fold binding on quilts. Narrow the strip to 2.25 inches for a more delicate look on fine quilts, or widen to 3 inches for a bold modern border. The fabric width determines how many strips you can cut from each row — most quilting cotton is 42–44 inches wide after washing and trimming the selvage. Select your fabric width from the preset buttons.
Step 3: Choose straight grain or bias binding
Straight grain binding is the standard choice for quilts with straight edges. Strips are cut along the grain (parallel to the selvage) or cross-grain (perpendicular). It produces less fabric waste and is easier to sew. Bias binding is cut at a 45-degree angle to the grain, giving the strip slight stretch that helps it ease around curves or scalloped edges. Bias binding requires more fabric for the same length, which the calculator accounts for.
Step 4: Read and use your results
The results show total binding length (including a 12-inch joining allowance), the number of strips to cut from your binding fabric, the minimum fabric yardage required, and the recommended purchase amount with a 10% waste buffer. Always buy the buffered amount — it's better to have leftover binding fabric than to discover you are half a strip short. The quilt size reference table below the calculator gives quick estimates for common quilt sizes so you can sanity-check your result.
Sewing tips for mitered corners
When attaching the binding, stop sewing 0.25 inches before each corner and backstitch. Fold the binding up at 45 degrees, then fold back down along the next edge. This creates a perfect mitered corner. When joining the binding ends, use a diagonal seam (not a straight seam) to avoid a bulky join. Press each strip seam open before attaching for the flattest possible finish.
FAQ
Is this quilt binding calculator free?
Yes, the quilt binding calculator is completely free with no limits. Calculate binding for as many quilt sizes as you need. No account is required and all calculations run instantly in your browser.
Is my data private?
Yes. Everything runs locally in your browser. No data you enter is ever sent to a server. Your quilt dimensions and fabric details stay entirely on your device.
What is the standard quilt binding width?
The most common binding strip width is 2.5 inches (6.4 cm) for double-fold binding. This produces a finished binding of approximately 0.5 inches (1.3 cm) on the front and back. Some quilters prefer 2.25-inch strips for a narrower look, or 3-inch strips for a wider, more modern binding. The calculator lets you customize this value.
What is the difference between straight grain and bias binding?
Straight grain binding is cut parallel to the selvage or perpendicular to it (cross-grain). It is the most common method because it wastes less fabric and is easy to sew. Bias binding is cut at a 45-degree angle to the fabric grain. It stretches slightly, making it ideal for curved edges, scalloped borders, or when you want the binding fabric's pattern to run diagonally.
Why does the calculator add extra length to the binding?
The calculator adds approximately 12 inches (30 cm) as a joining allowance. This accounts for the diagonal seam used to join binding strips end-to-end, the extra length needed to start and finish the binding, and a small buffer at the mitered corners. This is standard practice in quilt binding and ensures you never fall short at the final join.
How do I calculate the number of binding strips from a fat quarter?
A standard fat quarter is 18 × 21 inches. With 2.5-inch strips cut across the 21-inch side, you get 7 strips of approximately 21 inches each, for a total of 147 inches of binding — enough for a small quilt of about 25 × 25 inches perimeter. For most quilts you will need at least a quarter yard of fabric, and for queen or king sizes, half a yard or more.
Should I cut binding on the straight grain or the bias for a regular quilt?
For most quilts with straight edges, straight grain binding is the best choice. It is economical, easy to sew, and produces a clean, sharp corner at miters. Reserve bias binding for quilts with curved or scalloped edges where the slight stretch of bias cut helps the binding ease around curves without puckering.
How do I finish the binding — by hand or machine?
Both methods work well. Hand-stitching the back of the binding produces a clean finish with no visible stitching on the back, which is preferred for show quilts and heirlooms. Machine finishing (stitching-in-the-ditch from the front, or using a machine blindstitch) is faster and very durable, making it ideal for functional quilts that will be washed frequently.