Bias Width: What is the right size?

All posts may contain affiliate links.

Bias width…. What is the right size and how do I figure it out….. that is the question!

Determine Bias for Cording | The Sewing Loft

One of the most impressive things about this sewing blog is YOU! That’s right, you.  You keep me engaged, focused and inspired to share more.  So, last week when I shared an easy trick on custom piping, Christine asked how to determine the correct bias width based on the size of cording.  I thought this was a great question and wanted to share the basic formula.

Bias Width | The Sewing Loft

Actually, this is all about pie…. Nope, not the all American Apple Pie (although that is my personal fav!) It’s all about the math here.  We need 3.14 or P.IE

Bias Width: Determine the right size


Bias Width for cording | The Sewing Loft

First we need to figure out the circumference.  That is the diameter x 3.14  Or as my daughter told me C=Πd.  If your like me and want to avoid math, toss the tape measure around your cording and add a comfortable seam allowance.  I like to add  1″ to 1.5″ extra.  This will give me enough seam allowance for sewing bias around my cording and is the perfect bite for my presser foot.

**One quick note- I like to error on the side of extra, especially with thick cording.

I think it is really important that we all understand this blog is all about the art of learning, exploring and sharing our experiences.  I love that you ask questions and want you to know that I am here to answer them.  Understand that it may take me some time but I am listening and wanting to share more with this ever growing sewing circle!

So, a big THANK YOU to Christine and keep the questions coming!

The Sewing Loft





Hello! Are you new to The Sewing Loft?

If so, I’m glad you stopped by and hope that something has inspired you to keep your needle moving!  Don’t miss a single project and subscribe via email HERE! Bonus- free embroidery pattern with newsletter sign up.

Another great way to connect with me is via FacebookPinterestTwitterGoogle + or Follow my blog with Bloglovin.  I’m looking forward to getting to know you and creating together!


  1. Enid Mejias says

    This is a great blog. I would like to learn about paper piecing. Thanks.

  2. remember it’s the seam allowance doubled (top and bottom)

  3. Have been following your blog for a few months and find your tips very helpful. I have tried to edge a neckline and arms of a sleeveless top but have struggled to join the bias binding – do you have any tips for a neat finish?

  4. Karen Thurn says

    Do I have to use a bias piece of fabric to cover cording or will a straight of grain piece work too?

    • This depends on your project Karen. Straight grain is perfect for quilts or anything that does not have a curved edge. Bias is always the first choice for any curves. This will avoid rippling and provide a smooth outlook.

Speak Your Mind