Enter the length of the binding and the width of the binding into the calculator to determine the total square inches/feet needed.

Bias Tape Formula

The following formula is used to calculate the square inches of bias tape:

  • Where SQI is the square inches
  • LOB is the length of binding (inches)
  • WOB is the width of binding (inches)

To calculate the square inches of bias tape, multiply the length of the binding by the width of the binding.

Bias Tape Definition

A bias tape, also known as bias binding, is a strip of fabric (usually narrow) that is cut on a bias. The tape is used to bind, repair, or finish the edges of fabrics or seams.

Bias tape has fibers that run at 45 degrees to the length of the strip. This allows the fabric to stretch further and be used more easily for its purpose.

How to calculate bias tape amount?

Example Problem:

The following example outlines the steps needed to calculate the total square inches of bias tape needed for binding.

First, measure the total length of the binding. In this example, the total length is measured to be 50 inches.

Next, measure the total width of the binding. For this binding, the width is measured to be 10 inches.

Finally, calculate the total square inches of bias tape needed using the formula above:


SQI = 50 * 10

SQI = 500 square inches = 3.472 square feet


What is the importance of using bias tape in sewing projects?
Bias tape is crucial in sewing for several reasons. It provides a neat finish to fabric edges, adds durability to the seams and edges by preventing fraying, and allows for flexibility due to its stretch, making it ideal for curves and corners.

Can I make my own bias tape, and how?
Yes, you can make your own bias tape. You’ll need to cut strips of fabric on the bias (at a 45-degree angle to the weave of the fabric) to the desired width. These strips are then folded and pressed to hide the raw edges, creating a clean, foldable tape for use in your projects.

How do I choose the right width for my bias tape?
The width of bias tape needed depends on the project. For most applications, a standard width is 1/2 inch when folded. However, if you’re binding thicker fabrics or require a wider decorative edge, you may choose wider tape. Consider the project’s needs and personal preference when selecting bias tape width.