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Rag quilt math done right: the exposed seams eat twice the seam allowance from every square, so an 8" cut square with ¾" seams finishes at just 6½". Enter your cut size, seam allowance, and grid, and get the square count, per-layer yardage, batting squares, and true finished size.
80 squares (8 × 10), each finishing 6.5" after the 0.75" rag seams → quilt about 52" × 65".
Fabric (per layer)
3.625 yd per layer — 80 squares cut 8" × 8", about 5 per WOF strip × 16 strips.
Front + back = 7.25 ydtotal. Split each layer's yardage across however many prints you're mixing.
Middle layer (optional)
Batting squares cut 6.5" × 6.5" (finished size, so it stays out of the snipped seams): about 1.375 ydof 90"-wide batting — or use a third flannel layer cut like the others.
Sew with seams toward the FRONT, clip the exposed allowances every ⅜"–½" (spring-loaded rag snips save your hand), then wash and dry to bloom the rag. Clean the lint trap mid-cycle — flannel sheds a lot on the first wash.
Based on 8" cut squares with ¾" seams (6½" finished) — the most common combination:
| Quilt size | Grid | Squares | Fabric |
|---|---|---|---|
| Baby (~39×45") | 6 × 7 | 42 | 2 yd per layer |
| Toddler (~45×58") | 7 × 9 | 63 | 3 yd per layer |
| Lap (~52×65") | 8 × 10 | 80 | 3⅝ yd per layer |
| Throw (~58×71") | 9 × 11 | 99 | 4½ yd per layer |
| Twin (~65×91") | 10 × 14 | 140 | 6¼ yd per layer |
Compare with the standard quilt sizes chart — rag quilts run a little smaller than pieced quilts with the same square count, so size up a row if you're between sizes.
Plan each layer separately: squares × cut size, packed into width-of-fabric strips. A lap-size rag quilt of 80 squares cut at 8 inches takes about 3⅝ yards per layer — roughly 7¼ yards total for front and back. Rag quilts use noticeably more fabric than a pieced quilt of the same finished size because ¾-inch seams eat 1½ inches of every square.
½ to 1 inch, sewn with the seams exposed on the front. ¾ inch is the most common: enough allowance to clip into a full, shaggy rag without weakening the seam. Whatever you choose, subtract twice that from the cut size to get each square's finished size — 8-inch squares with ¾-inch seams finish at 6½ inches.
Cotton flannel is the classic choice — it frays into a soft, full chenille edge after washing. Regular quilting cotton works but rags less dramatically. Denim makes a heavy, durable picnic-style rag quilt. Avoid fabrics that don't fray (fleece, minky) for the exposed seams — they'll stay flat instead of blooming, though minky is popular as a backing layer.
It's optional. Many flannel rag quilts skip batting entirely — two or three flannel layers are already warm and heavy. If you add a middle layer, cut it at the finished square size (not the cut size) so it stays out of the seam allowance you'll be snipping, and quilt an X across each square sandwich to hold it.
No binding needed — that's part of the appeal. Sew a line of stitching around the entire outer edge at your seam-allowance distance, then clip the outer margin just like the interior seams. After washing, the perimeter blooms into the same ragged edge as the rest of the quilt.
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