This sewing yardage calculator determines the total linear yards of fabric required to cut pattern pieces from standard commercial textile bolts. Fabric is sold off bolts with fixed widths (most commonly 45 inches or 60 inches wide), meaning pattern pieces must be nested efficiently across the bolt width to minimize textile waste.

### Yardage Formulas & Shrinkage Allowance The calculator evaluates piece dimensions against bolt constraints:

- **Pieces per Bolt Width:** $\text{Pieces Across} = \max\left(1, \left\lfloor \frac{\text{Bolt Width}}{\text{Piece Width}} \right\rfloor\right)$ - **Rows of Pattern Pieces:** $\text{Rows Needed} = \left\lceil \frac{\text{Total Quantity}}{\text{Pieces Across}} \right\rceil$ - **Total Length with Allowance:** $\text{Total Length (in)} = \text{Rows Needed} \times \text{Piece Length} \times 1.10$ *Note:* The $1.10$ multiplier incorporates a standard $10\%$ safety margin for pre-wash fabric shrinkage, seam allowances, and straightening raw cuts. - **Total Yardage & Commercial Rounding:** $\text{Exact Yards} = \frac{\text{Total Length (in)}}{36}$ Commercial fabric stores cut yardage in increments of $1/4$ yard ($0.25\text{ yd}$). The tool rounds exact yardage up to the next quarter yard: $\lceil \text{Exact Yards} \times 4 \rceil / 4$.

### Worked Numeric Example Cutting two curtain panels from a 45-inch bolt: - **Piece Length:** 72 inches - **Piece Width:** 38 inches - **Bolt Width:** 45 inches - **Quantity:** 2 pieces

**Step-by-Step Calculation:** 1. Pieces across bolt: $\lfloor 45 / 38 \rfloor = 1$ piece per row. 2. Rows needed: $2 / 1 = 2$ rows. 3. Raw length: $2 \times 72 = 144$ inches. 4. Length with $10\%$ allowance: $144 \times 1.10 = 158.4$ inches. 5. Exact yards: $158.4 / 36 = 4.40$ yards. 6. Rounded to nearest quarter yard: **$4.50$ Yards** ($4.11$ meters).

### Privacy and Client-Side Execution All calculations execute in JavaScript inside your local web browser session. No project measurements or pattern notes are sent to external servers.