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How much backing fabric for a 108 × 108 quilt?
King size quilt, finished 108″ × 108″ (274.3 cm × 274.3 cm).
Buy
9 3/4 yd
of standard 42″–44″ quilting cotton — 3 panels × 116″ with 2 vertical seams. Or 6 1/2 yd of 108″ wide backing (2 panels × 116″ with 1 vertical seam). Metric: 8.9 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″): 108 + 8 = 116″ wide, 108 + 8 = 116″ 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 3 widths of fabric, each 116″ long.
- 3 × 116″ = 348″ = 9.67 yards → round up to the next ⅛ yard: 9 3/4 yd.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 112″ × 112″ | 9 3/8 yd (3 panels) | 6 1/4 yd | 8.6 m |
| 3″ | 114″ × 114″ | 9 1/2 yd (3 panels) | 6 3/8 yd | 8.7 m |
| 4″ | 116″ × 116″ | 9 3/4 yd (3 panels) | 6 1/2 yd | 8.9 m |
| 5″ | 118″ × 118″ | 9 7/8 yd (3 panels) | 6 5/8 yd | 9.0 m |
| 6″ | 120″ × 120″ | 13 3/8 yd (4 panels) | 6 3/4 yd | 12.2 m |
Same quilt: binding & batting
- Binding for a 108 × 108 quilt: 12 strips of 2½″ → 7/8 yd.
- Batting: at least 116″ × 116″ — a King package fits.
Try your own numbers
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