This fiber arts calculator determines total yarn yardage and ball/skein purchasing quantities for common knitting and crochet projects. Different craft techniques consume yarn at dramatically different rates: crochet stitches loop through worked stitches to form dense three-dimensional post structures, requiring approximately 33% more continuous yarn than stockinette or garter knitting.

### Base Project Consumption and Craft Factors The calculator references established textile yardage baselines for adult garments and accessories: - **Throw Blanket (Project Type 1):** Baseline 1,800 yards of medium-weight yarn. - **Adult Sweater (Project Type 2):** Baseline 1,400 yards. - **Winter Scarf (Project Type 3):** Baseline 400 yards. - **Beanie Hat (Project Type 4):** Baseline 200 yards.

**Craft Multiplier:** - **Knitting (Craft Type 1):** Multiplier is $1.0\times$. - **Crochet (Craft Type 2):** Multiplier is $1.33\times$ to account for yarn consumption in single, double, and treble crochet stitches.

**Safety and Waste Allowance:** A $10\%$ safety buffer ($1.10\times$) is automatically added to ensure sufficient continuous yarn for gauge swatching, seam stitching, weave-in tails, and minor tension variations.

**Formulas:** $\text{Total Yards} = \text{round}(\text{Base Yards} \times \text{Craft Multiplier} \times 1.10)$ $\text{Skeins to Purchase} = \left\lceil \frac{\text{Total Yards}}{\text{Yards per Skein}} \right\rceil$ $\text{Metric Equivalent} = \text{round}(\text{Total Yards} \times 0.9144)\text{ meters}$

### Worked Numeric Example Planning an adult throw blanket: - **Project:** Throw Blanket ($1,800\text{ yards}$ baseline) - **Technique:** Knitting ($1.0\times$ multiplier) - **Yarn Skein Size:** 220 yards per skein (worsted weight ball)

**Step-by-Step Calculation:** 1. Base yardage with craft factor: $1,800 \times 1.0 = 1,800\text{ yards}$. 2. Adding $10\%$ safety allowance: $1,800 \times 1.10 = 1,980\text{ yards}$ ($1,811\text{ meters}$). 3. Calculating skeins: $\lceil 1,980 / 220 \rceil = \lceil 9.0 \rceil = 9\text{ Skeins}$. *Note:* If switching this same blanket to crochet ($1.33\times$), the requirement increases to $1,800 \times 1.33 \times 1.10 = 2,633\text{ yards}$, requiring $\lceil 2,633 / 220 \rceil = 12\text{ skeins}$.

### Client-Side Processing Note All calculations run instantly in client-side JavaScript. No craft patterns, yarn selections, or measurements are sent across a network.