Work out sewing fabric requirement instantly with clear inputs, formula shown and shareable results.
The number of pieces fitting across the fabric width sets how many rows are needed, and the fabric length is those rows times the piece length. Because pieces per width is a whole number, a piece just over half the fabric width wastes almost half the cloth, which is why nesting the layout matters.
Pieces across
per row = floor(fabric width / piece width)
Fabric length
length = ceiling(pieces / per row) x piece length
per row = floor(fabric width / piece width). The number of pieces fitting across the fabric width sets how many rows are needed, and the fabric length is those rows times the piece length.
Because pieces per width is a whole number, a piece just over half the fabric width wastes almost half the cloth, which is why nesting the layout matters.
Enter number of pattern pieces, length of one piece, width of one piece, usable fabric width. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.