No more guessing (or running short!) when it comes to quilt batting and backing. This calculator helps you quickly work out how much fabric you'll need for your quilt backing — whether you're piecing it, using a wideback, or working with standard-width fabric. Just pop in your quilt size, and you'll know exactly what to cut and buy.

 

How to Use the Quilt Batting & Backing Calculator:

Step 1: Enter Your Finished Width and Length Quilt Dimensions. Select inches or centimetres using the dropdown menu.

Step 2: Select Your Backing Fabric Width from the dropdown menu.

Step 3: Set any Extra fabric allowance (the default is 4 inches)​

Step 4: The Calculator automatically updates as you type.​

 

The Results show you your finished quilt size and the required size, which includes the extra allowance. They also provide the exact dimensions to cut your batting​and backing and a handy shopping list.

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Special Features:

Real-time Updates - results update instantly as you change values.

Multiple Width Handling: The calculator tells you how many fabric widths to sew together if your quilt is wider than your fabric.

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Pro Tips:

• Always buy a little extra fabric for shrinkage and mistakes

• Pre-wash your backing fabric before use

• Consider the fabric direction when piecing multiple widths

• 108" wide backing fabric eliminates seams for most quilts

 

The calculator does all the math for you - just enter your quilt size and start shopping!