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Find how much continuous bias binding a square of fabric yields, or work backward from the length you need to the fabric size, based on your strip width.

📘 How to Use

  1. Choose the direction, fabric to binding length or binding length to fabric
  2. Enter the fabric square side or the binding length you need
  3. Enter the cut width of one bias strip

Bias Binding Calculator

in

The side length of the square used for the continuous bias method

in

Add a little extra for seam allowance and joins

in

The cut width of one bias strip (cut width, not finished width)

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Bias Binding Calculator | Continuous Bias Yield Both Ways

Work out how much continuous bias binding a square of fabric yields, or go the other way and find the fabric size needed for a given length. Change the strip width to compare how yield shifts before you cut.

💡 About this tool

Anyone who has made quilt binding or garment piping knows the sinking feeling of cutting into fabric, sewing the tube, and coming up short. The continuous bias method (sewing a square into a tube and cutting one long spiral strip) squeezes a lot of binding out of a modest square, but the resulting length is hard to eyeball.

This calculator uses the standard quilting formula: usable area divided by strip width gives binding length, where the area is the side minus a seam margin, squared. The seam margin is 0.5 in (about 1.3 cm in metric), deducted from each side because that edge is consumed when the square is sewn into a tube. Working backward, it multiplies the length you need by the strip width to get the required area, then takes the square root and adds the seam margin back to tell you how big a square to cut.

🧐 Frequently Asked Questions

Q. Why not just square the side length directly? A. When you sew the square into a tube, the seam allowance along each edge is lost. The formula deducts a 0.5 in (about 1.3 cm) margin from each side first, so the area reflects only the fabric you can actually turn into strips. Skipping it overestimates the yield.

Q. Do I enter the finished width or the cut width? A. The cut width of a single strip. Finished width is smaller after folding and seam allowance, so always use the width at which you cut.

Q. How accurate is the result? A. It is the theoretical yield of the continuous bias method. Grain straightening, shrinkage, and join losses move the real figure, so add a little extra to whatever length your edge actually needs.

Q. Can I use a rectangle instead of a square? A. The tool assumes a square. For a rectangle, treat the area as length times width (each minus the seam margin) divided by the strip width, or enter the shorter side as the square side for a conservative estimate.

📚 Fun Facts

A small square goes a surprisingly long way. A 24 in square cut into 2.5 in strips yields roughly 220 in of continuous binding in one piece, a number quilters lean on so often it appears on printed cheat sheets. "Bias" means the 45-degree line across the weave, where woven fabric stretches most. That stretch is exactly why bias binding hugs curves and corners that straight-grain binding would pucker around, making it the go-to finish for scalloped quilt edges and rounded necklines.