62
inches
21
inches
2
pieces
1
rows
62
inches
1.89
yards
1.73
meters
62
inches
21
inches
2
pieces
1
rows
62
inches
1.89
yards
1.73
meters
Running out of fabric mid-project is one of the most frustrating experiences in sewing — especially when working with a discontinued print, a limited-edition designer fabric, or a specialty textile that required significant investment. Buying too much, on the other hand, leads to costly excess. The Fabric Yardage Calculator solves both problems by computing exactly how many yards (or meters) of fabric you need for any sewing project, taking into account piece dimensions, the number of pieces, fabric bolt width, seam allowances, and a customizable waste factor for pattern matching and cutting inefficiencies.
Fabric is sold from a bolt — a roll of fabric of a standard width. The most common widths are 44 inches (standard quilting cotton), 45 inches (general apparel and craft fabric), 54 inches (home décor and drapery fabric), 58–60 inches (apparel knit fabrics and many wovens), and 72 inches (wide fleece, batting, and decorator fabrics). The bolt width is crucial to yardage calculation because it determines how many pieces you can cut from a single row before advancing to the next length of fabric. A 10-inch-wide piece cuts four across a 44-inch bolt, but only three across if the fabric has a 2-inch seam allowance on each side.
Seam allowance — the extra fabric beyond the cut line that gets folded and stitched into the seam — is added to all cut dimensions. Standard seam allowance for garment sewing is 5/8 inch (0.625 in) per side, but this varies by pattern and technique. Home décor sewing often uses 1/2 inch, quilting typically uses 1/4 inch, and some couture patterns use as much as 1 inch. The calculator adds twice the seam allowance (one for each side) to both the width and length of each pattern piece before computing how many pieces fit per row.
The waste factor accounts for the inevitable fabric loss from salvage edges (the finished edges of a bolt that are often too stiff or damaged to use), pattern matching (plaids, stripes, and large prints require aligning each piece to the repeat, consuming extra fabric), fabric defects, and directional fabrics that require all pieces to run the same way. A 10% waste factor is a reasonable starting point for solid or small-print fabrics. Plaids and stripes with a large repeat may require 20–25% extra. Directional prints with a large vertical repeat can easily require 30% more fabric than the calculated base amount.
Understanding the pieces-per-row output is particularly useful for efficient cutting layouts. If 2 pieces fit side by side on the bolt, you only need half as many rows compared to cutting one piece per row — reducing total fabric length significantly. Many sewists sketch a cutting layout diagram before purchasing fabric to confirm their piece arrangement and minimize waste. This calculator provides the foundational data for that layout planning. For multi-piece patterns (such as garments with bodice, sleeves, and skirt panels of different dimensions), run the calculator separately for each piece group and sum the yardages.
Whether you are sewing a single sundress, making twenty tote bags for a boutique, or planning the fabric requirements for a full theatrical costume production, accurate yardage calculation prevents costly mistakes and helps you purchase with confidence. Always buy fabric from the same dye lot when possible, and when in doubt, round up to the next quarter yard — the small additional cost is always worthwhile compared to the frustration of running short.
1. Add 2× seam allowance to piece width and length. 2. Pieces per row = floor(Fabric Width / Adjusted Piece Width). 3. Rows needed = ceiling(Number of Pieces / Pieces per Row). 4. Raw inches = Rows × Adjusted Piece Length. 5. Apply waste factor: Total inches = Raw inches × (1 + Waste%/100). 6. Convert: yards = inches/36; meters = inches × 0.0254.
Always round up to the nearest 1/4 yard when purchasing. Most fabric stores sell in 1/4 yard increments. If the calculator returns 1.87 yards, buy 2 yards. For print fabrics with a repeat, add the full repeat length to the calculated yardage to ensure adequate matching material. For garment patterns with multiple different-sized pieces, calculate each piece separately and sum the yardages — do not average.
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Two 16×13 inch panels (with 0.5 in SA) fit three across a 44-inch bolt, so only one row of 17-inch length is needed. With 10% waste, the total is just over half a yard. Buy 5/8 yard (0.625) or round up to 3/4 yard for comfortable margin.
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Four 90×50 inch curtain panels (with 1 in SA) on 54-inch fabric only fit one across. Four rows of 92-inch length = 368 raw inches. With 15% waste for a patterned drapery fabric, purchase 12 yards. This is a reminder why home décor projects require generous yardage budgets.
Most commercial garment patterns in the US use 5/8 inch (about 1.6 cm) seam allowance. Home décor and pillow projects often use 1/2 inch. Quilting uses 1/4 inch. European patterns frequently use 1 cm or 1.5 cm. Always check your specific pattern's stated seam allowance and enter that value into the calculator.
Add one full pattern repeat length per cut length of fabric. For example, if your fabric has a 12-inch vertical repeat and your pieces are 30 inches long, buy fabric as if each piece is 42 inches (30 + 12) to ensure you can align the repeat at seams. For large furniture or drapery repeats (18–24 inches), this can add 1–2 yards per panel.
Fabric width is the usable width of the fabric from selvage to selvage (the finished edges). The selvage often has printed text or holes from the production process and is typically not used in the project. The usable width may be 1–2 inches narrower than the labeled width on each side. Most calculators and patterns account for this by using conservative width estimates.
Yes, but note that stretch fabrics often require less yardage than wovens because they conform to the body. Many knit garment patterns are designed with 0 seam allowance on seams that will be serged. Also, stretch fabrics are often 58–60 inches wide, so select the appropriate bolt width. The waste factor should account for the fact that knits can run or unravel from cut edges during handling.
Run this calculator separately for each unique piece size (e.g., bodice front, bodice back, sleeve, skirt panel) with the correct quantity of each. Sum all the calculated yardages. Then add 10–15% for the overall waste factor. Many sewists also sketch a scaled cutting layout diagram to verify all pieces fit efficiently within the yardage calculated.
A fat quarter is a half-yard of fabric cut in half widthwise rather than lengthwise, resulting in an 18×22 inch rectangle (vs. a standard 9×44 inch quarter-yard cut). Fat quarters are common in quilting because the squarer shape accommodates more efficient cutting of patchwork pieces. One fat quarter = 0.25 yards by weight/price but offers different dimensions than a standard quarter-yard.
Use 20–30% for plaids and stripes, depending on repeat size. Small 1-inch gingham checks need only 15–20% extra. Bold 6-inch plaid repeats may need 25–30%. For very large repeats (over 12 inches), consider adding one full repeat length to every cut panel length rather than using a percentage estimate, as the percentage approach can under-account for large repeats.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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