Guides
These notes explain the inputs used by the calculators. They are not a substitute for the tool on the page you are planning.
Fabric width and usable width
A bolt can be sold as 44 inches wide and still be planned at 42 usable inches. The calculators ask for the width you are willing to cut, not the number printed on the end of the bolt.
Inches, yards, centimeters, and meters
Switching units should describe the same piece of cloth. These calculators convert into inches, do the geometry there, and convert the purchase quantity only at the end.
Pattern repeat and yardage
A vertical repeat makes each row, or each curtain cut, long enough to land on the next repeat. Matching a motif across a seam is a different problem.
Quilt backing overage
Backing has to be larger than the quilt top so it can be loaded, quilted, and trimmed. How much larger depends on the frame and the quilter.
Curtain fullness
Fullness is the relationship between flat fabric and the finished coverage. It changes with the heading, the cloth, and the look you want.
Cross stitch fabric count
Count tells you how many stitches fit in an inch, after you account for how many fabric threads each cross covers.
Straight-grain and bias binding
Straight-grain binding can be counted from the quilt perimeter and the cloth width. Continuous bias needs a construction sequence that an area formula does not finish.