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How much backing fabric for a 70 × 90 quilt?
Twin size quilt, finished 70″ × 90″ (177.8 cm × 228.6 cm).
Buy
5 1/2 yd
of standard 42″–44″ quilting cotton — 2 panels × 98″ with 1 vertical seam. Or 2 1/4 yd of 108″ wide backing (one piece, no seams — cut 78″). Metric: 5.0 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″): 70 + 8 = 78″ 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 vertically you need 2 widths of fabric, each 98″ long.
- 2 × 98″ = 196″ = 5.44 yards → round up to the next ⅛ yard: 5 1/2 yd.
Sewing the seams the other way (horizontal) would take 3 panels × 78″ with 2 horizontal seams = 6 1/2 yd , so vertical seams save fabric.
Backing yardage with different overhang
| Extra per side | Backing size | 42″ fabric | 108″ wide | Metric |
|---|---|---|---|---|
| 2″ | 74″ × 94″ | 5 1/4 yd (2 panels) | 2 1/8 yd | 4.8 m |
| 3″ | 76″ × 96″ | 5 3/8 yd (2 panels) | 2 1/8 yd | 4.9 m |
| 4″ | 78″ × 98″ | 5 1/2 yd (2 panels) | 2 1/4 yd | 5.0 m |
| 5″ | 80″ × 100″ | 6 3/4 yd (3 panels) | 2 1/4 yd | 6.1 m |
| 6″ | 82″ × 102″ | 6 7/8 yd (3 panels) | 2 3/8 yd | 6.3 m |
Same quilt: binding & batting
- Binding for a 70 × 90 quilt: 9 strips of 2½″ → 5/8 yd.
- Batting: at least 78″ × 98″ — a Queen package fits, or 2 3/4 yd off a 96″ roll.
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