Quilt Backing Calculator
Calculate the required fabric yardage for quilt backing, including seam allowances and shrinkage.
Published by:
isCalculator Editorial Team
Was this calculator helpful?
How to use this tool?
This calculator determines the total yardage of fabric needed for a quilt backing. It accounts for seam allowances, fabric shrinkage, and optional extra yardage.
- Enter Quilt Dimensions – Input the Quilt Width and Quilt Length in inches (e.g., 60 and 80).
- Set Fabric Width – The standard fabric width is 44 inches, but you can adjust it (e.g., 108 for wide backing).
- Adjust Seam Allowance – Default is 0.5 inches. This is added to all edges for piecing.
- Add Shrinkage – Enter a percentage (e.g., 3%) to compensate for fabric shrinkage after washing.
- Optional Extra Yardage – Add extra fabric (in yards) for matching patterns or mistakes (e.g., 0.5).
- Click "Calculate" – The result shows the required yardage rounded up to the nearest quarter yard, with a detailed breakdown below.
Note: All measurements must be in inches (imperial). The calculator automatically adjusts dimensions for shrinkage and seam allowances, then calculates how many fabric widths are needed and the total yardage.
Previous Results
| Result | Inputs | Date |
|---|
Frequently Asked Questions
Measure the width and length of your quilt top after quilting. Add extra for seam allowances and shrinkage.
Common widths are 44 inches (standard quilting cotton) and 108 inches (wide backing). Enter your fabric's actual width.
Cotton fabrics can shrink when washed. Adding a percentage (e.g., 3%) ensures your backing won't be too small after washing.
It's recommended to add 0.25 to 0.5 yards for pattern matching or mistakes. Adjust based on your confidence.