You enter the project piece dimensions, fabric bolt width, number of pieces, and seam allowance. The tool adds seam allowance to all four sides, computes the area per piece, multiplies by the number of pieces, applies a 10% waste factor, divides by the fabric bolt width to get a linear length in inches, converts to yards, and rounds up to the nearest 1/8 yard. It assumes rectangular pieces laid out along the fabric width with no pattern matching or nap consideration.
Directional prints and napped fabrics (like velvet or corduroy) require all pieces to be cut in the same direction, which typically increases waste by 15–25% beyond the standard 10% factor. Consider adding an extra 1/4 to 1/2 yard to the result.
Most commercial sewing patterns use a 5/8" allowance. Quilting projects typically use 1/4". If you are working without a pattern, 3/8" is a common middle ground. Check your pattern instructions for the specified allowance.
Standard quilting cotton is 44–45 inches wide. Apparel fabrics vary from 45 to 60 inches. Home decor fabrics are often 54 inches. Check the bolt end or the retailer's listing for the actual width.
No. Many natural fabrics (cotton, linen) can shrink 3–5% after the first wash. If you plan to pre-wash your fabric, buy an additional 5–10% beyond what this calculator suggests.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.