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How much backing fabric for a 80 × 90 quilt?
Full size quilt, finished 80″ × 90″ (203.2 cm × 228.6 cm).
Buy
7 3/8 yd
of standard 42″–44″ quilting cotton — 3 panels × 88″ with 2 horizontal seams. Or 2 1/2 yd of 108″ wide backing (one piece, no seams — cut 88″). Metric: 6.8 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″): 80 + 8 = 88″ wide, 90 + 8 = 98″ 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 88″ long.
- 3 × 88″ = 264″ = 7.33 yards → round up to the next ⅛ yard: 7 3/8 yd.
Sewing the seams the other way (vertical) would take 3 panels × 98″ with 2 vertical seams = 8 1/4 yd , so horizontal seams save fabric.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 84″ × 94″ | 7 yd (3 panels) | 2 3/8 yd | 6.5 m |
| 3″ | 86″ × 96″ | 7 1/4 yd (3 panels) | 2 1/2 yd | 6.6 m |
| 4″ | 88″ × 98″ | 7 3/8 yd (3 panels) | 2 1/2 yd | 6.8 m |
| 5″ | 90″ × 100″ | 7 1/2 yd (3 panels) | 2 1/2 yd | 6.9 m |
| 6″ | 92″ × 102″ | 7 3/4 yd (3 panels) | 2 5/8 yd | 7.1 m |
Same quilt: binding & batting
- Binding for a 80 × 90 quilt: 10 strips of 2½″ → 3/4 yd.
- Batting: at least 88″ × 98″ — a Queen package fits, or 2 3/4 yd off a 96″ roll.
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