Sewing FAQ

A rag quilt is sewn wrong sides together, so every seam allowance sits on top of the quilt instead of hidden inside it. You clip those allowances, wash the quilt, and the cut edges bloom into the soft fringe the quilt is named for.

That single reversal is what makes a rag quilt a rag quilt — and it is why almost every instinct you have about pressing seams open does not apply here.

The seam allowance and the fringe depth are the same measurement. The calculator defaults to ½″, which is a good general answer: deep enough to fray well, not so deep it eats the quilt.

Go wider for a shaggier fringe and a smaller finished quilt, narrower for a tidier edge that frays less. Whatever you pick, use it everywhere — a seam allowance that drifts is the most common reason blocks stop lining up.

Because the seam allowance comes off both sides of every square. A block finishes at its cut size minus twice the seam, so an 8″ square sewn at ½″ finishes at 7″ — an inch lost per block, in both directions.

Across a quilt planned at eight blocks wide, that is eight inches. It is the single most common rag-quilt miscalculation, and it is why the calculator asks for the cut size and the finished quilt separately instead of trusting you to reconcile them on graph paper.

For a rag quilt, usually not. Shrinkage in the first wash is doing real work — it tightens the seams and fluffs the fringe — so prewashing spends the effect before the quilt exists.

Two exceptions are worth respecting. Wash first if you are mixing fibers that shrink at very different rates, because cotton flannel against a poly blend will pull the finished quilt crooked. And test any saturated red or deep indigo for bleeding, or put a color catcher in the first wash.

This is the opposite of the advice for a conventional quilt, which is exactly why it comes up so often.

Cotton flannel is the standard, and deservedly — it is loosely woven, it blooms quickly, and it starts out soft. Homespun and ordinary quilting cotton both work and fray less dramatically.

Denim and heavier wovens make a substantial quilt with a coarser fringe, at the cost of a much harder clipping session. Tight weaves like batik and sateen barely fray at all, and synthetics do not fray so much as fuzz. When in doubt, cut a scrap, clip it, and put it through a wash before you buy eight yards.

Often not. Two layers of flannel is already a warm quilt, and plenty of rag quilts are just top and backing.

If you do want a middle layer, cut it smaller than the outer squares so it stays out of the seam allowance — otherwise it stiffens the fringe and fights you at the machine. Leave the calculator's middle-layer cut size blank and it will size that layer for you.

Quilting cotton is sold as 42″ to 44″, but the selvages are not usable and the bolt is not always honest about the rest. 41″ is deliberately conservative: it costs you a fraction of a yard and it keeps you from being one square short at eleven at night.

If you buy from a source you have measured and trust, change the number — it is an input for a reason.

Snip perpendicular to the seam, roughly every ½″, stopping a couple of threads short of the stitching line. Closer snips give a denser fringe and more work; wider snips leave it stringy.

Spring-loaded snips are worth owning before you start rather than after. This is the longest and dullest stretch of the project, and it is where most unfinished rag quilts are abandoned.

The quilt sheds — a lot. Wash it on its own, and expect to clear the dryer's lint filter several times in a single cycle. A full-size flannel quilt throws off a genuinely surprising volume of lint, and a clogged filter is a fire risk rather than just a nuisance.

Shaking the quilt out hard before it goes in the dryer takes a good deal of it off up front.

A long fabric strip wrapped around a soft core — usually batting cut into strips — then coiled into a spiral and joined to itself with a wide zigzag as you go.

There is no backing, no binding and no pattern. The shape comes entirely from how you steer the coil, which is why the same technique makes a flat oval rug and a standing basket.

Because that is a jelly roll. Precut 2½″ strips are the most common way to buy fabric for this, so the calculator does its arithmetic in that unit — one jelly roll is about forty strips at 2½″ × 44″.

Cutting your own to the same width keeps every estimate on the page valid.

A 30″ × 44″ oval takes roughly 1,200 yards, and that is not a typo. Every stitch pulls from the spool and the bobbin, so the total splits between them — which still leaves a bobbin holding 80 yards needing to be refilled many times over.

Wind several before you start; running dry mid-coil is the most irritating way to stop. If you expect to make more than one rug, buy thread on a cone.

A zigzag wide enough to bite both coils at once. The seam is bulky and heavily layered, so a 90/14 or 100/16 denim or topstitch needle survives better than a universal, and a walking foot feeds the coil far more evenly than a standard one.

Slow down. This is not a project to race the machine through, and a snapped needle at speed is how people get hurt.

Tension in the coil. Pulling the strip tight as you round the curves draws the center up into a bowl; feeding in too much slack makes the outer rounds ripple.

Both are easy to correct in the first few rounds and very hard to fix at the end, so lay the rug on a flat table every few rounds and look at it edge-on rather than checking once it is finished.

Worth knowing: cupping is not a defect when you want it. It is exactly how the calculator's bowl and basket shapes are made.

A headband has to be smaller than the head it grips. That difference is negative ease, and it is the entire reason the band stays put rather than riding off.

The calculator defaults to 12%, so a 22″ head gets a band cut a little under 19½″ before seam allowance. Firm ribbed knits with strong recovery can take more; a soft jersey with little spring back wants less.

One with recovery, not merely stretch. Cotton jersey with no spandex will stretch to fit and then stay stretched, and the band slides off by lunchtime.

Look for a few percent spandex or elastane — interlock, ribbing and activewear knits all behave. The test is simple: pull a piece and watch whether it snaps back or just gives up.

A straight stitch has no give, so it snaps the first time the band stretches over a head.

Use a narrow zigzag, a dedicated stretch stitch or a serger, and fit a ballpoint or stretch needle so the point slips between the knit loops instead of cutting through them. Cut loops are how a knit develops a run.

Not yet. The calculators and this FAQ are here so you can make the thing yourself, or price your own work honestly if you sell it.

If that changes it will say so here first.

That is usually the arithmetic being right and the market being uncomfortable. Handmade textiles take hours the finished object does not visibly show, and a great deal of craft-fair pricing quietly sets the maker's hourly rate near zero.

The tool will not argue you out of your number. What it will do is show you what you are actually choosing when you discount. If the honest price will not sell where you are selling, the answer is more often a different venue or a smaller product than a smaller wage.

Overhead covers the real costs that never appear on the receipt for any one project: needles, thread, rotary blades, machine servicing, electricity, booth fees, the batting you bought for something else. It is applied to materials and labor together.

Margin is profit, added after that. It pays you for the risk of making a thing before anyone has agreed to buy it.

They are kept separate on purpose. Rolled into one number, you cannot see which of the two you are cutting when you drop a price.

The tool deliberately does not pick for you. A rate you would be content to work a full Saturday for is a reasonable floor.

If a number makes you wince when the total appears, that is useful information — but it is information about the price of the object, not a verdict on whether your time is worth it.

The field exists because many states treat craft-fair and online sales as taxable retail, sometimes requiring a permit even for very small sellers. The rules vary considerably by state and they change.

Check with your own state's revenue department rather than taking a number from a calculator. This one only does the arithmetic once you know your rate.

Free, no sign-up, and nothing you type leaves your browser. The math runs on your own phone or laptop; there is no server on the other end to send it to.

The share links some of the tools build put your numbers in the URL itself, which is what makes them shareable — worth a glance before you post one publicly.

Most often it is seam allowance or prewashing. Half an inch of difference per seam compounds quickly across a whole quilt.

Directional prints and fussy cutting also push yardage above any formula, because you are deliberately throwing fabric away to place a motif. Treat these numbers as a close estimate, and buy a little extra whenever the fabric matters or would be hard to reorder.