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How much sashing fabric for any quilt grid. Reference table for 12″ blocks at common sashing widths.
20 blocks (5 × 4) at 12″ with 2″ sashing finish at 72″ × 58″, counting the sashing around the outside edge.
Sashing fabric
1¼ yd — cut 18 strips 2½″ wide across the fabric (40″ usable).
Sub-cut 24 pieces 2½″ × 12½″ and join strips for 5 long rows 2½″ × 72½″ (longer than one strip, so piece them end to end).
How it goes together
Sew the short pieces between the blocks in each row, then set the rows apart with the long strips. Mark the long strips where each block should land so the columns stay lined up.
Want cornerstones? Switch above — you would need 30 squares at 2½″.
Cut sizes add ½″ to the finished size for ¼″ seams and round up to the next ⅛″. Yardage counts whole strips across 40″ of usable width and rounds up to the next ¼ yd, so there is a little in hand for a cutting slip.
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| Grid (rows×cols) | 1.5″ sashing | 2″ sashing | 2.5″ sashing | 3″ sashing |
|---|---|---|---|---|
| 3×4 (Baby) | ~0.7 yds | ~0.8999999999999999 yds | ~1.2 yds | ~1.4 yds |
| 4×5 (Throw) | ~1 yds | ~1.3 yds | ~1.7 yds | ~2 yds |
| 5×7 (Twin) | ~1.5999999999999999 yds | ~2.1 yds | ~2.6 yds | ~3.2 yds |
| 6×8 (Queen) | ~2 yds | ~2.7 yds | ~3.4000000000000004 yds | ~4.2 yds |
| 7×8 (King) | ~2.3000000000000003 yds | ~3 yds | ~3.9000000000000004 yds | ~4.8 yds |
Estimates include 10% safety margin. For cornerstones, add 0.25 yds of cornerstone fabric.
Cornerstones are small squares at sashing intersections. For a grid of R rows × C columns, you need (R+1) × (C+1) cornerstone squares, each cut at (sashing width + 1/2″).
| Grid | Cornerstones needed | Cut size (2″ sash) |
|---|---|---|
| 3×4 (Baby) | 20 | 2-1/2″ squares |
| 4×5 (Throw) | 30 | 2-1/2″ squares |
| 5×7 (Twin) | 48 | 2-1/2″ squares |
| 6×8 (Queen) | 63 | 2-1/2″ squares |
| 7×8 (King) | 72 | 2-1/2″ squares |
A solid works as a clean frame; a contrasting print makes bolder cornerstones.
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For a queen-size quilt (6×8 grid of 12-inch blocks) with 2-inch sashing, you need approximately 1.5–2 yards of sashing fabric. The exact amount depends on the grid size, block size, and sashing width. Always add 10% for cutting waste.
Cornerstones are small squares placed at the intersections where sashing strips meet. In a grid with cornerstones, each intersection has a contrasting square rather than a continuous sashing strip. Cornerstones add a secondary design element and are a great use for a bold accent fabric.
Sashing width is a design choice. Common widths: 1.5" (narrow, emphasizes blocks), 2" (balanced, most common), 2.5" (moderately open), 3–4" (wide, airy feel, great for showcasing quilting stitches). Very wide sashing can make a quilt look like a sampler.
Yes, significantly. Adding 2" sashing between blocks in a 6×8 queen layout adds approximately 14" to the width and 18" to the height. Sashing is a common tool for making a quilt larger without making more blocks.
Dimensions, bed fit, batting, and backing math for every size on the quilt sizes chart.