The numbers below are for that 70 by 90 inch quilt, with 4 inches of overhang for the backing and batting, 2 1/2 inch binding strips, and ordinary 42 inch quilting cotton. Change the quilt in the card and they follow.
Materials for a 70 × 90 inch quilt
Four inches of overhang on the back and the batting. Binding is 2 1/2 inch strips. The top is not in this list, because a pieced top is not a rectangle.
- Binding, 42" fabric
- 5/8 yard
- Backing, 42" fabric
- 5 1/2 yards
- Backing, 108" fabric
- 2 3/4 yards
- Batting to cut
- 78" × 98"
Open Backing in the studio. The form on this page is that calculator.
The top is not a rectangle
A pieced twin top is not "70 times 90, divided by the width of the fabric." Seams, sashing, and the way a block is cut all change the yardage, and a single number would be a guess wearing a precise face. Design the top, or follow a pattern that already counted the pieces. Quiltler's fabric calculator does that from the design itself.
People still want a shopping range. A simple twin top is often somewhere around 5 to 8 yards in total, split across several fabrics, before backing and binding. Treat that as a budget for the shop, then replace it with the pattern's list or a design before you cut.
Twin beds and dorm rooms
Seventy by ninety inches covers a standard twin with a practical drop. Twin XL dorm beds are longer; bump the length toward 95 inches in the card, or start from the Twin XL row in the quilt sizes guide. The back on 42 inch goods is two panels for this size — still manageable on a dining table, but plan the seam before you cut.
Design the twin layout in the studio with the twin quilt designer page as your brief. Yardage from the pieces, not from a rectangle, is the longer explanation on how to calculate quilt fabric.