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How much backing fabric for a 100 × 100 quilt?
King size quilt, finished 100″ × 100″ (254 cm × 254 cm).
Buy
9 yd
of standard 42″–44″ quilting cotton — 3 panels × 108″ with 2 vertical seams. Or 6 yd of 108″ wide backing (2 panels × 108″ with 1 vertical seam). Metric: 8.3 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″): 100 + 8 = 108″ wide, 100 + 8 = 108″ 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 108″ long.
- 3 × 108″ = 324″ = 9.00 yards → round up to the next ⅛ yard: 9 yd.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 104″ × 104″ | 8 3/4 yd (3 panels) | 3 yd | 8.0 m |
| 3″ | 106″ × 106″ | 8 7/8 yd (3 panels) | 6 yd | 8.1 m |
| 4″ | 108″ × 108″ | 9 yd (3 panels) | 6 yd | 8.3 m |
| 5″ | 110″ × 110″ | 9 1/4 yd (3 panels) | 6 1/8 yd | 8.4 m |
| 6″ | 112″ × 112″ | 9 3/8 yd (3 panels) | 6 1/4 yd | 8.6 m |
Same quilt: binding & batting
- Binding for a 100 × 100 quilt: 11 strips of 2½″ → 7/8 yd.
- Batting: at least 108″ × 108″ — a King package fits.
Try your own numbers
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