About Quilt Backing Calculator
Less guesswork at the fabric counter. More time at the sewing machine.
Quilt Backing Calculator is a free tool for planning backing fabric. It compares vertical and horizontal panel layouts, accounts for seam allowances and overhang, and turns the result into a cut list you can print or share.
No account is needed. The calculation runs in your browser, and your measurements stay in the page address so you can return to the same plan.
What the estimate covers
Rectangular quilt tops and full-width backing panels, with optional extra purchase length for prewashing. It does not plan diagonal piecing, directional print matching, or irregular scraps. Measure your own fabric and check your quilter’s instructions before cutting.
Help improve the calculator
If something looks wrong, email contact@quiltbackingcalc.com with your measurements and the result you expected.