Quilt Backing Calculator

Add your planned overhang, typically 4 inches per side, to both the width and length of your finished quilt top. Divide the resulting backing width by your usable fabric width, 40 inches for standard cotton, to find how many panels to piece together, then multiply that by the backing length and convert to yards. A 58 by 66 inch quilt with 4 inch overhang needs 2 panels and about 4.25 yards. Enter your own dimensions above for an exact figure.

4 inches per side, 8 inches total added to both width and length, is the standard most longarm quilters request. That margin gives the machine's rollers and clamps something to grip along the edges and leaves room for trimming once quilting is finished and the top is squared up. Domestic machine quilting needs less, usually 2 to 3 inches per side, since there's no frame or rollers to clear. Stretchier fabrics like minky often need 6 per side, so it's worth confirming with your longarm quilter before cutting.

About 40 inches. Quilting cotton is cut and sold at 42 to 44 inches, but the selvages, the tightly woven edges carrying the manufacturer's color dots, have to be trimmed off, and a little more is lost squaring the raw edges straight before piecing. Using 40 inches as the real usable figure, rather than the fabric's labeled width, keeps a backing yardage estimate from coming up short.

It depends on how wide your backing needs to be. Standard cotton runs 40 inches usable, so any backing wider than that needs two or more panels sewn together. Wide backing fabric, woven up to 108 inches, covers most throw, lap, and queen-size quilts with a single seamless panel. Wide backing costs more per yard but needs less total yardage and avoids piecing issues on a longarm frame; standard cotton offers far more print and color choices.

Half an inch, wider than the quarter-inch seam allowance used for piecing quilt blocks. The extra width adds durability to a seam that gets stretched repeatedly across a longarm frame or handled during quilting. Press the seam open rather than to one side, which keeps it flatter under a longarm's rollers and avoids leaving a visible ridge on the finished, quilted backing.

Offset to one side of center rather than running straight down the middle. Quilts are typically folded vertically and horizontally through the center, and a seam sitting on that fold line wears faster and is more likely to crease permanently over time. For a backing needing three panels, centering one full-width panel with a narrower strip added to each side creates two seams, and neither lands on the centerfold.

Most 100% cotton fabric shrinks 3 to 5% on its first wash. That shrinkage, along with fabric lost squaring up the finished quilt, isn't built into a straight yardage calculation, so adding roughly a quarter yard on top of the calculated total gives enough buffer to cover both. Prewashing backing fabric before cutting removes the shrinkage variable entirely, though some quilters skip it to preserve the fabric's original crisp hand.

Yes, but it takes extra fabric and care. A directional print, one with an obvious up-and-down orientation like stripes or a scenic design, needs consistent orientation across every pieced panel, and matching the pattern's repeat across a seam commonly takes an extra third to half a yard beyond the basic yardage calculation, more for a large-scale repeat. A non-directional print or solid color avoids that extra planning and cost.

A busy, small-scale print hides uneven stitches, thread tension inconsistencies, and minor quilting mistakes far better than a plain or solid-color backing, where every skipped stitch and thread color mismatch shows clearly. That makes a busy print a practical, forgiving choice for a first pieced backing or while machine or hand-quilting stitch consistency is still developing.

WOF stands for width of fabric — the distance from selvage to selvage on the bolt, which is the fabricWidth figure this calculator uses to work out how many panels a backing needs. Standard quilting cotton is around 40 inches to 44 inches WOF, though only about 40 inches is usable once the selvages are trimmed off. A pattern calling for "2 x WOF" for backing means two full panels cut the fabric's full folded width, then pieced together.

Not exactly. Cut batting to the same overhang as backing, but many quilters trim batting about half an inch smaller on each side so it doesn't peek out past the backing during basting and doesn't interfere with binding later. Both batting and backing still need the same minimum overhang, 3 to 4 inches per side for longarm quilting, or 2 to 3 inches for a domestic machine, since less handling and smaller rollers make the extra margin less critical.

It's not about backing size at all, it's a fabric-selection guideline for the quilt top: choosing around seven different fabrics in a range of scales, from a large theme print down to small tone-on-tone accents, to build visual contrast and depth. If you found this term while researching backing yardage, the number you actually need is the 3 to 4 inch overhang per side used to size batting and backing, not a fabric count.