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How much backing fabric for a 86 × 100 quilt?
Full size quilt, finished 86″ × 100″ (218.4 cm × 254 cm).
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7 7/8 yd
of standard 42″–44″ quilting cotton — 3 panels × 94″ with 2 horizontal seams. Or 3 yd of 108″ wide backing (one piece, no seams — cut 108″). Metric: 7.2 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″): 86 + 8 = 94″ 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 horizontally you need 3 widths of fabric, each 94″ long.
- 3 × 94″ = 282″ = 7.83 yards → round up to the next ⅛ yard: 7 7/8 yd.
Sewing the seams the other way (vertical) would take 3 panels × 108″ with 2 vertical seams = 9 yd , so horizontal seams save fabric.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 90″ × 104″ | 7 1/2 yd (3 panels) | 2 1/2 yd | 6.9 m |
| 3″ | 92″ × 106″ | 7 3/4 yd (3 panels) | 3 yd | 7.1 m |
| 4″ | 94″ × 108″ | 7 7/8 yd (3 panels) | 3 yd | 7.2 m |
| 5″ | 96″ × 110″ | 8 yd (3 panels) | 3 1/8 yd | 7.4 m |
| 6″ | 98″ × 112″ | 8 1/4 yd (3 panels) | 3 1/8 yd | 7.5 m |
Same quilt: binding & batting
- Binding for a 86 × 100 quilt: 11 strips of 2½″ → 7/8 yd.
- Batting: at least 94″ × 108″ — a King package fits, or 3 yd off a 96″ roll.
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