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How much backing fabric for a 120 × 120 quilt?
King size quilt, finished 120″ × 120″ (304.8 cm × 304.8 cm).
Buy
14 1/4 yd
of standard 42″–44″ quilting cotton — 4 panels × 128″ with 3 vertical seams. Or 7 1/8 yd of 108″ wide backing (2 panels × 128″ with 1 vertical seam). Metric: 13.1 m of 110 cm fabric.
How it's worked out
- Add 4″ on every side for quilting (long-arm quilters usually ask for 4″–5″): 120 + 8 = 128″ wide, 120 + 8 = 128″ long.
- Quilting cotton is 42″–44″ wide; after trimming selvages about 40″ is usable, and each seam takes 1″.
- Running the seams vertically you need 4 widths of fabric, each 128″ long.
- 4 × 128″ = 512″ = 14.22 yards → round up to the next ⅛ yard: 14 1/4 yd.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 124″ × 124″ | 13 7/8 yd (4 panels) | 7 yd | 12.6 m |
| 3″ | 126″ × 126″ | 14 yd (4 panels) | 7 yd | 12.9 m |
| 4″ | 128″ × 128″ | 14 1/4 yd (4 panels) | 7 1/8 yd | 13.1 m |
| 5″ | 130″ × 130″ | 14 1/2 yd (4 panels) | 7 1/4 yd | 13.3 m |
| 6″ | 132″ × 132″ | 14 3/4 yd (4 panels) | 7 3/8 yd | 13.5 m |
Same quilt: binding & batting
- Binding for a 120 × 120 quilt: 14 strips of 2½″ → 1 yd.
- Batting: at least 128″ × 128″ — buy it by the yard.
Try your own numbers
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