Fabric Yardage Calculator for Sewing Patterns
Figure out how much fabric to buy for a sewing project based on pattern pieces, fabric width, and layout.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Yards = (Rows x Piece Length x (1 + Waste%)) / 36
The calculator determines how many pattern pieces fit across the fabric width (accounting for seam allowances), calculates the number of rows needed, multiplies by the piece length, adds waste factor and pattern repeat adjustments, then converts total inches to yards.
Worked Examples
Example 1: Simple Dress with 8 Pattern Pieces
Problem:Calculate fabric for a dress with 8 pattern pieces averaging 24 inches long by 15 inches wide on 45-inch fabric, 5/8 inch seam allowance, 15% waste.
Solution:Piece with seams: 15 + (2 x 0.625) = 16.25 inches wide\nPieces across 45\" fabric: floor(45 / 16.25) = 2\nRows needed: ceil(8 / 2) = 4\nLength per row: 24 + (2 x 0.625) = 25.25 inches\nTotal length: 4 x 25.25 = 101 inches\nWith 15% waste: 101 x 1.15 = 116.15 inches\nYards: 116.15 / 36 = 3.23 yards
Result:3.23 yards needed | Round up to 3.25 yards (3 1/4 yd)
Example 2: Curtain Panels with Pattern Repeat
Problem:4 curtain panels, each needs 6 pattern pieces, averaging 48 inches long by 20 inches wide. 54-inch fabric with 12-inch pattern repeat. 10% waste.
Solution:Piece width with seams: 20 + 1.25 = 21.25 inches\nPieces across 54\" fabric: floor(54 / 21.25) = 2\nRows per panel: ceil(6 / 2) = 3\nLength per row (with repeat): ceil(49.25 / 12) x 12 = 60 inches\nTotal per panel: 3 x 60 = 180 inches\nWith 10% waste: 180 x 1.10 = 198 inches = 5.5 yards\nFor 4 panels: 5.5 x 4 = 22 yards
Result:22 yards total for 4 panels | 5.5 yards per panel
Frequently Asked Questions
How do I calculate fabric yardage for a sewing project?
To calculate fabric yardage, start by determining the number of pattern pieces and their dimensions. Add seam allowances to each piece (typically 5/8 inch or 1.5 cm). Then consider how many pieces fit across the fabric width (typically 45 or 60 inches). Divide the total number of pieces by pieces-across to find how many rows you need, and multiply rows by the piece length to get total length needed. Add a waste factor of 10% to 20% for cutting errors, pattern matching, and fabric flaws. Finally, divide the total length in inches by 36 to convert to yards. Always round up to the nearest 1/8 yard when purchasing.
What fabric widths are commonly available?
Fabric widths vary by type and are important for accurate yardage calculations. The most common widths are: 45 inches (114 cm), standard for quilting cotton, broadcloth, and many dress fabrics; 54 to 60 inches (137-152 cm), common for apparel fabrics like wool, linen, and polyester blends; 108 to 120 inches (274-305 cm), available for quilt backing and sheeting fabrics; and 36 inches (91 cm), sometimes found in specialty silks and vintage-style fabrics. Wider fabrics allow more efficient piece placement and may require less total yardage. When substituting a different width than called for in a pattern, you will need to recalculate the yardage requirements.
How does pattern repeat affect fabric yardage needs?
Pattern repeat refers to the distance between identical elements in a printed or woven design. Matching pattern repeats at seams requires additional fabric because you must align the design across pieces, resulting in more waste. A small repeat of 1 to 3 inches adds about 10% to 15% extra fabric. Medium repeats of 4 to 12 inches may add 15% to 25% extra. Large repeats of 13 to 27 inches or more can add 25% to 50% additional fabric. To calculate, divide each cut piece length by the repeat distance, round up to the next whole number, and multiply by the repeat distance. This ensures each piece starts at the same point in the pattern.
What is the standard seam allowance for sewing?
The standard seam allowance varies by application and pattern type. In home sewing and commercial patterns, 5/8 inch (1.5 cm) is the most common standard, as it provides enough fabric for strong seams while allowing for adjustments. However, many modern indie patterns use 1/2 inch or 3/8 inch seam allowances to reduce bulk. Quilting patterns typically use 1/4 inch (6mm) seam allowances. Knit fabrics often use 1/4 to 3/8 inch allowances. Industrial garment manufacturing uses 3/8 inch for efficiency. When calculating fabric yardage, always check your pattern's specified seam allowance and add it to all edges of each pattern piece.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy