Rag quilts sew their seams on the outside and clip them into fringe, so every square carries a deep seam allowance on all four sides. Enter your quilt and square size; you get the counts, the cut size, and the flannel per layer.
Your Rag Quilt
Seam allowance becomes the fringe
Your Quilt Takes
80squares per layer
8 × 10 grid · finished 48 × 60 in
Stack 2 squares, sew an X through each stack, join wrong-sides-together at 0.75 in, clip the seams every ⅜–½ in, then wash and dry.
- Cut each square7.5″
- Total squares, 2 layers160
- Per strip of 40″ flannel5
- Flannel per layer3 ⅜ yd (16 strips)
- Flannel in all6 ¾ yd
The Formulas
cut square = finished + 2 × seam allowance · squares = (width ÷ finished) × (length ÷ finished)yardage per layer = ⌈squares ÷ per strip⌉ × cut size ÷ 36The seams sew wrong-sides-together so the allowances stand up on the front, and the clipping turns them to fringe after washing. A ¾ in seam on both sides of every square is why rag quilts use noticeably more fabric than their finished size suggests.
Worked Example
A 50 × 60 in rag throw from 6 in finished squares, ¾ in seams, two flannel layers:
- Grid: 50 ÷ 6 → 8 across (48 in), 60 ÷ 6 = 10 down → 80 squares per layer, 160 flannel squares total.
- Cut size: 6 + 1½ = 7½ in. Five fit a 40 in strip → 16 strips → 3⅜ yd per layer, 6¾ yd in all.
- Snips: four sides × 80 squares of clipping, spring-loaded rag snips earn their price around square thirty.
How to Choose Your Inputs
- Square size: 5–8 in finished is the usual range; smaller squares mean more fringe lines and more clipping.
- Seam allowance: ½ in frays short and neat, 1 in goes shaggy. Whatever you pick, sew every seam at exactly that width, the fringe lines are the design.
- Fabric: flannel and homespun cotton fray into soft fringe; quilting cotton frays thinner, denim barely. Prewash nothing, the first wash makes the rag.
Assumptions and Defaults
- Each layer buys separately: fronts one print set, backs another.
- A 3-layer quilt’s middle squares can cut 2 × seam smaller (they stay out of the fringe); the calculator sizes them full for simplicity and the scraps forgive it.
- No batting: the flannel layers are the warmth. Wanting batting, cut it at the finished size and treat it as the middle layer.
- Grid counts round to whole squares and the true finished size is reported.
Rag Quilt Questions, Answered
How many squares do I need for a rag quilt?
A rag quilt needs the width ÷ the finished square size across and the length ÷ the square size down, times the number of layers. The 50 × 60 in throw in 6 in squares takes 80 squares per layer, which means 160 squares of flannel in two layers.
What size do I cut rag quilt squares?
Rag quilt squares are cut at the finished size plus twice the seam allowance, so a 6 in square with ¾ in seams cuts at 7½ in. The allowance becomes the fringe, which is why it is double the usual piecing width and meant to show.
How much flannel do I need for a rag quilt?
A 50 × 60 in rag quilt throw in 6 in squares needs about 3⅜ yards of flannel per layer, or twice that for two layers. Flannel shrinks considerably, so buy it unwashed and let the first wash of the finished quilt create the fringe.
Do I quilt rag quilt squares before joining them?
Yes, most rag quilts are quilted before joining, with an X sewn corner to corner through each stacked square so the layers hold together as one. Sew the X, stack the squares, then join them wrong sides together so the seams face the front, where they will fray into fringe.
Why didn’t my rag quilt fringe fluff?
Rag quilt fringe doesn’t fluff when the clips are too far apart or the fabric won’t fray. Clip every ⅜ to ½ in, almost to the stitching, then wash and dry the finished quilt, since that agitation creates the fringe; tightly woven batiks never fluff, whereas flannel always does.