It's the first question every quilter asks, and the honest answer is "it depends on the size of your quilt top." But "it depends" isn't helpful at the cutting counter, so here are the working numbers quilters actually use — followed by the reasoning, so you can adjust for your own pattern.

Quick Answers: Total Yardage by Quilt Size

These figures assume a simple patchwork top (not a single-panel print), 44-inch-wide quilting cotton, and a pieced back. They include three layers: quilt top fabric, backing, and binding:

Why the Backing Often Costs More Than the Top

Beginners are consistently surprised that backing yardage exceeds top yardage for throws and larger. The reason: the quilt sandwich needs the backing to extend at least 4 inches beyond the top on every side for machine quilting, and a 44-inch-wide fabric rarely covers a quilt's width in one piece — so the back gets seamed from two or more panels. That's why 108-inch wideback fabric exists: one panel covers a queen-width quilt with no seaming, and our calculator shows the difference instantly.

Three Things That Change the Numbers

• Precuts change the math entirely. A jelly roll (forty 2½″ strips) or layer cake (forty 10″ squares) covers a specific finished size listed on the packaging — you're no longer buying yardage for the top, only for the back and binding.
• Pattern style matters. Scrap quilts use the least; large-block quilts with big squares use more because cutting waste is higher. The table above assumes a mixed-patchwork average.
• Buy extra for mistakes and shrinkage. The universal quilter's insurance is an extra half yard of each fabric. Mis-cuts happen, dye lots run out, and future repairs will thank you.

The Formula Behind Every Estimate

If you'd rather compute it yourself, the logic is always the same: finished width + overhang ÷ usable fabric width tells you how many strips or panels across, and that count times the length tells you the yardage. Cut allowances of about 10–15% absorb seams, selvedge, and squaring. It's exactly the arithmetic our calculator automates — try it once manually to understand it, then let the tool handle the rounding.