Quilt Backing Calculator
Calculate how much backing fabric you need and how to piece panels together.
Tip: Use 4" overhang for machine quilting, 6-8" for long-arm quilting.
How to Use
- Enter your finished quilt top width and length in inches.
- Choose your backing fabric width (44" is standard quilting cotton; 108" is wide backing).
- Set your desired overhang — typically 4" per side for machine quilting.
- Click Calculate Backing to see yardage and piecing instructions.
Common Quilt Backing Reference
| Quilt Size | 44" Fabric | 108" Fabric | Panels (44") |
|---|---|---|---|
| Baby (36"×45") | 1.5 yds | 1.5 yds | 1 |
| Throw (60"×80") | 5 yds | 2.5 yds | 2 |
| Full (80"×90") | 7.5 yds | 3 yds | 3 |
| Queen (90"×108") | 9 yds | 3.5 yds | 3 |
| King (108"×108") | 10 yds | 3.5 yds | 3–4 |
Piecing Tips
When piecing 44" backing panels, press seams open to reduce bulk. Place seams off-center so they don't run down the middle of your quilt. For a horizontal seam, cut two pieces each half the total length plus a few inches for seam allowance.
About this Quilt Backing Calculator
Use this free Quilt Backing Calculator to get quick, accurate results directly in your browser. It is designed for everyday use with no signup, no downloads, and no account required. No signup is required, and the tool works on phones, tablets, and desktop browsers.