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How much backing fabric for a 90 × 108 quilt?
Queen size quilt, finished 90″ × 108″ (228.6 cm × 274.3 cm).
Buy
8 1/4 yd
of standard 42″–44″ quilting cotton — 3 panels × 98″ with 2 horizontal seams. Or 3 1/4 yd of 108″ wide backing (one piece, no seams — cut 116″). Metric: 7.5 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″): 90 + 8 = 98″ 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 horizontally you need 3 widths of fabric, each 98″ long.
- 3 × 98″ = 294″ = 8.17 yards → round up to the next ⅛ yard: 8 1/4 yd.
Sewing the seams the other way (vertical) would take 3 panels × 116″ with 2 vertical seams = 9 3/4 yd , so horizontal seams save fabric.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 94″ × 112″ | 7 7/8 yd (3 panels) | 3 1/8 yd | 7.2 m |
| 3″ | 96″ × 114″ | 8 yd (3 panels) | 3 1/4 yd | 7.4 m |
| 4″ | 98″ × 116″ | 8 1/4 yd (3 panels) | 3 1/4 yd | 7.5 m |
| 5″ | 100″ × 118″ | 8 3/8 yd (3 panels) | 3 3/8 yd | 7.7 m |
| 6″ | 102″ × 120″ | 10 yd (3 panels) | 3 3/8 yd | 9.2 m |
Same quilt: binding & batting
- Binding for a 90 × 108 quilt: 11 strips of 2½″ → 7/8 yd.
- Batting: at least 98″ × 116″ — a King package fits.
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