Okay, confession time: the very first rag quilt I ever made, I ran clean out of flannel with two rows left to go. Had to drive back to the store, dig through the bin, and pray they still had my print. (Spoiler: they did not.) So if you've ever wondered how many squares you need—or how much fabric to buy for a rag quilt—you're my people, and this little chart is for you.
Sixteen years and more rag quilts than I can count later, here's the cheat sheet I wish someone had handed me on day one. Pin it, print it, screenshot it—just don't learn the hard way like I did.
The quick-and-dirty formula
Every number below comes down to three little rules:
- Finished square = cut size − two seam allowances. Those big frayy seams eat into your square. Cut a 6" square, sew a ½" seam, and you're left with a 5" finished square.
- Squares across = width ÷ finished square. Same math for the rows going down.
- Across × down = your total squares. That's it. That's the magic.
My chart runs on 6" squares + a ½" seam = 5" finished, which is my happy place. Want a chunkier, fluffier fray? Bump up to a 1" seam (I'll show you how to tweak it below).
Rag quilt size chart
| Quilt size | Finished size | Layout (across × down) | Total squares | Fabric per layer |
|---|---|---|---|---|
| Baby / car seat | 35" × 40" | 7 × 8 | 56 | ~1½ yd |
| Crib | 40" × 50" | 8 × 10 | 80 | ~2 yd |
| Lap | 45" × 55" | 9 × 11 | 99 | ~2½ yd |
| Throw | 50" × 65" | 10 × 13 | 130 | ~3¼ yd |
| Twin | 60" × 85" | 12 × 17 | 204 | ~5 yd |
| Full / double | 75" × 85" | 15 × 17 | 255 | ~6¼ yd |
| Queen | 85" × 90" | 17 × 18 | 306 | ~7½ yd |
| King | 100" × 90" | 20 × 18 | 360 | ~8¾ yd |
"Fabric per layer" is one layer of standard 42"–44" cotton. Most rag quilts are two layers (a top and a backing sewn wrong sides together), so double it—then split it however you like between your print and your backing. Adding flannel or batting in the middle? That's layer number three.
How much fabric for a rag quilt?
Short version: from regular 42"–44" cotton you'll get about 42 squares per yard, per layer (7 across, 6 rows down). So take your total squares, divide by 42, and round up. A throw at 130 squares? That's 130 ÷ 42 ≈ 3 yards per layer.
Then remember—two layers—so double it and split it between your pretty print and your cozy backing. Not sure which fabrics fray up the softest? I spill all my secrets in What Fabric Do I Use for Rag Quilts?
Want a different size square?
Totally fine. Here's how to tweak the chart:
- Bigger squares = faster finish. Cut 8" squares (7" finished) and divide your dimensions by 7 instead of 5. A baby quilt drops to just 30 squares. You're welcome.
- Bigger seam = more fluff. A 1" seam finishes your 6" square at 4", so divide by 4 and plan on a few extra squares. (So worth it. So fluffy.)
That seam is the real make-or-break here—if you've never been totally sure how much to use, peek at Rag Quilt Seam Allowance: How Much Do You Need? before you start cutting.
A few things I've learned the hard way
- Always buy a little extra. A spare quarter-yard beats another sad trip to the fabric store. Ask me how I know.
- Don't prewash—that first wash is what makes the fray bloom. (Flannel shrinks a smidge, though, so cut generously.)
- Odd numbers of rows just look better. Don't lose sleep over a perfect grid.
And that's the whole secret! From a little car-seat cuddler all the way up to a king, you can cut with confidence now. The fun part—picking fabrics and snipping all those seams in front of a good show—is all that's left. Happy ragging, friends!
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