Use our quilt backing calculator to quickly determine the amount of fabric you need for the back of your quilt.
Quilt Backing Calculator
How to Use the Calculator
To use the quilt backing calculator, simply enter your quilt’s width and length measurements into the provided input fields. If you want to account for extra length on each side of the quilt, enter a value in the Extra Length field. Your seam width will be used to calculate the total amount of fabric needed for the backing. After entering all the required information, press “Calculate” to receive your quilt backing dimensions.
How It Calculates the Results
The calculator takes your input for quilt dimensions and seam width to calculate the necessary backing size. It adds the seam allowance to all sides of the quilt to ensure that there’s enough fabric for the quilting process and for the backing to sit comfortably beneath the quilt top. Extra length can be added if you prefer your quilt to hang over the edges of the mattress or for any additional purposes. It outputs a total width and length that will fully cover the back of your quilt, including the extra width and length you have added.
Limitations
This calculator assumes that the backing fabric is wide enough for your quilt without needing to piece additional widths of fabric together. It does not account for directional prints or pattern matching. Always double-check measurements and consider the width of your fabric before cutting.