Assumptions to check before cutting
- 42 inches usable WOF; 2.5-inch cut strips; straight-grain double-fold binding for rectangular straight edges.
- Target = outer-edge perimeter + 12-inch finishing reserve. Use your actual trimmed quilt measurements and your own reserve.
- Diagonal intermediate joins lose one strip width each: joined length = N x 42 - (N - 1) x 2.5. The final end join is covered by the reserve.
- Purchase depth = strips x 2.5 inches, rounded up once to 1/8 yard. Shrinkage, faults and extra overlap are excluded.
- For the 60 x 80 example, seven strips give 279 inches, less than the 292-inch target. Eight give 318.5 inches; buy 0.625 yard.
Use this reference with your project
The table is a quick bench reference. The interactive planner handles your own measurements and explains the calculation. These are planning dimensions, not full-size cutting patterns or a guarantee of a physical sewing result.
Print at any readable size. The PDF includes this page's address so you can return to the current explanation without an account.