Calculate fabric yardage for quilt blocks, sashing, borders, and backing by quilt size.
Quilt yardage math looks like area arithmetic, but fabric is sold in fixed widths by the yard, so a 12-inch finished block needs a 12.5-inch cut square and only three of those fit across a 42-inch width. This tool converts a quilt size and its parts - blocks, sashing, borders, backing - into yards, handling seam allowances, how many pieces fit across the fabric width, and rounding up to a cuttable increment. The surprise most quilters hit: backing a quilt wider than about 40 inches takes two seamed panels, roughly doubling the yardage a first guess would suggest.
A concrete input and expected output from the current implementation.
Input
Blocks: 20 squares, 12 in finished. Quilt top: 48 x 60 in. Fabric: 42 in wide. Backing: 108 in wide.
Expected output
Blocks: 2.5 yd. Backing: 2 yd. Total: 4.5 yd.
Each block needs a 12.5-inch cut square (1/4-inch seams on all sides), and three fit across 42 inches, so 20 blocks take seven 12.5-inch strips: 87.5 inches, or 2.43 yards, rounded up to 2.5. The 48 x 60 top needs a 56 x 68-inch backing, which fits in one 108-inch-wide length of 68 inches, or 1.89 yards, rounded up to 2.
For each piece type the tool adds a 1/4-inch seam allowance to every edge (a 12-inch finished block becomes a 12.5-inch cut square), counts how many of those cut pieces fit across the fabric's usable width, converts the strip length from inches to yards, and rounds up to a standard cut increment. Changing the assumed fabric width can flip the pieces-per-row count and change the yardage by a full strip.
Backing gets a 4-inch overhang on each side, 8 inches total per dimension. If the backing width exceeds the fabric width, the tool seams panels side by side, each the full quilt length, so yardage becomes panels times length. Entering a 108-inch wide-back width usually shows a large saving: one panel, no center seam, and often less than half the yardage of 42-inch fabric.
Because a finished block is not the piece you cut. A 12-inch finished block needs a 12.5-inch cut square, only three of those fit across a 42-inch width, and 20 squares force a seventh full strip: 87.5 inches, or 2.43 yards, rounded up to 2.5. The leftover column of every strip is waste you pay for but cannot sew.
With 42-inch fabric, about 4.5 yards: the backing measures 68 x 80 inches, wider than one panel, so you seam two 80-inch lengths (160 inches, or 4.44 yards, rounded up). With 108-inch wide-back, one 80-inch length is 2.25 yards and there is no center seam. Enter both widths and compare before buying.
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