Binding wraps the raw edges of a quilt. To size it, find the perimeter, add overlap for joining and corners, then work out how many fabric strips you need.
Strips = (P + 10) ÷ Wᵒ
What the terms mean
| Symbol | Meaning |
|---|---|
| Strips | Number of strips needed |
| P | Quilt perimeter, in inches |
| 10 | Overlap and corner allowance |
| Wᵒ | Usable width of fabric, about 40 in |
Worked example
A 60 by 80 in quilt has a 280 in perimeter: (280 + 10) ÷ 40 = 7.25, so cut 8 strips.
Round up always. Round the strip count up to a whole number, then a little more for safety. Running short on binding mid-quilt is a headache.
See the Binding Calculator and the Quilt Size Chart.