Calculate Bias Binding Yardage

Enter the finished binding length you need and the strip width — get exact yardage for your fabric square or rectangle.

Common Binding Presets

Baby Quilt (40x44")

168" binding, 2.25" strips

Twin Quilt (70x90")

320" binding, 2.25" strips

Queen Quilt (90x108")

396" binding, 2.5" strips

King Quilt (108x108")

432" binding, 2.5" strips

Binding Length Needed inches

Strip Width inches

Fabric Width (inches)

Waste % (seams, cutting)

How bias binding works: Traditional bias binding is cut at a 45-degree angle from the selvage, giving it stretch and flexibility to curve around shapes. This calculator estimates using the continuous bias binding method — start with a fabric square, cut it diagonally, and sew the ends to form a continuous strip. The result is the minimum fabric yardage needed.

Colorful bias binding fabric strips folded and stacked

How to Calculate Fabric for Bias Binding

Calculating fabric yardage for bias binding involves finding the total area of fabric needed, then working backward to determine the smallest square of fabric that can produce that binding. Here is the formula:

Step 1 — Required Binding Area:
Total binding area = Binding length × Strip width

Step 2 — Fabric Square Size:
Square side = √(Total binding area × (1 + Waste%))
Round up to the nearest inch

Step 3 — Yardage from Square:
Since a square yard = 36" × 36", divide the square side by 36
(Then round up to nearest ⅛ or ¼ yard for purchasing)

For example, you need 168" of 2.25"-wide binding for a baby quilt. Required area: 168 × 2.25 = 378 square inches. An ~19.5" square of fabric gives you ~380 sq in — about ½ yard of 42" wide fabric. Adding 10% waste: round up to ⅝ yard for safety.

Continuous Bias Binding Method

The most efficient way to make bias binding is the continuous method. Cut a square of fabric on the true bias (45°), sew the two cut edges together to form a tube, then cut a continuous spiral of binding. This method produces the longest continuous binding from the smallest piece of fabric — ideal for quilts with curved edges, necklines, or any project that needs flexible, stretchy binding.

The table below shows the recommended starting square size for common binding lengths and widths:

Bias Binding Yardage Reference Chart

Binding Length	Strip Width	Fabric Square	Yardage (42" wide)	Use Case
120"	2.25"	16" × 16"	½ yard	Crib quilt, small project
168"	2.25"	20" × 20"	½ yard	Baby quilt
240"	2.25"	24" × 24"	⅔ yard	Lap quilt, table runner
320"	2.25"	28" × 28"	¾ yard	Twin quilt
320"	2.5"	30" × 30"	⅞ yard	Twin quilt
396"	2.5"	33" × 33"	1 yard	Queen quilt
432"	2.5"	35" × 35"	1 yard	King quilt
600"	2.5"	42" × 42"	1¼ yards	Large quilt, long garment
720"	3"	48" × 48"	1⅓ yards	Extra-large project

Square sizes are minimums for continuous bias binding. Add 10% for waste and seam allowances. Wider 54" fabric produces the same yardage from a shorter length.

Bias Binding Strip Width Guide

The strip width you choose depends on your project and how much fabric you want visible on the finished edge. Standard quilting binding uses 2.25" to 2.5" wide strips, which fold to roughly ⅜" to ½" finished width. Garment bias binding typically uses narrower strips — 1.5" to 2" — for a delicate finish on necklines and armholes. Heavy upholstery binding uses 3" or wider strips for a substantial edge.

Strip Width	Finished Width (doubled)	Best For
2"	~⅜"	Fine garments, lightweight quilts, miniatures
2.25"	~⅜"	Standard quilt binding, most projects
2.5"	~½"	Quilt binding, scarves, home decor
3"	~⅝"	Heavy quilts, upholstery, thick fabrics
3.5"	~¾"	Extra-thick batting, display quilts

Frequently Asked Questions

What's the difference between bias binding and straight-grain binding?

Bias binding is cut at a 45-degree angle to the fabric grain, giving it stretch and flexibility to curve smoothly around rounded edges and corners. Straight-grain binding is cut parallel to the selvage — it's more economical but doesn't stretch, so it only works on straight edges. For quilts with curved edges, necklines, or armholes, always use bias binding. The bias binding fabric calculator above estimates for continuous bias strips, which are the most efficient way to make bias binding from a square piece of fabric.

How do I make continuous bias binding from a fabric square?

Cut your fabric square on the diagonal (corner to corner). Sew the two triangles together along the straight-grain edges to form a parallelogram. Mark parallel lines at your strip width along the bias edge, then sew the two short ends together offset by one strip width. Cut along the marked lines in a continuous spiral — you'll get one long strip of bias binding with minimal waste. The calculator above estimates the minimum square size for your required binding length.

How much binding do I need for a quilt?

Measure the quilt perimeter: (length + width) x 2, then add 10" to account for mitered corners and joining the ends. For a queen quilt (90" x 108"), the binding length is (90 + 108) x 2 + 10 = 406 inches. Then decide your strip width — 2.25" is standard. Enter these into the bias binding calculator above to find the exact fabric yardage needed. For our queen example, you need roughly 1 yard of 42" wide fabric.

Can I cut bias binding from a rectangle instead of a square?

Yes. A rectangle cut on the bias produces more total binding length than a square of the same area because the diagonal is longer. The rectangle method is more fabric-efficient but requires more careful layout. For most home sewists, the square method is simpler and the calculator above is designed for square pieces. If you want to use a rectangle, enter your fabric dimensions into our fabric converter and compare the area.

What is the best fabric for bias binding?

Quilting-weight 100% cotton is the most common choice — it presses well, holds a crease, and has enough body to fold neatly. For garments, lightweight cotton, silk, or cotton-linen blends work well. Always prewash your fabric before cutting bias strips to prevent shrinkage after application. Avoid heavy upholstery fabric for bias binding — it's too thick to fold smoothly around corners unless you use a very wide strip (3.5"+) or a single-fold method.

You Might Also Need

Bias binding is a finishing technique used in many sewing projects. These related calculators and guides can help:

Quilt Fabric Calculator — calculate yardage for quilt tops and backing
Fabric Converter — convert between yards, inches, meters, and centimeters
How Much Fabric Do I Need — general guide for all project types
Clothing Fabric Yardage — bias binding is commonly used in garment sewing