Editorial & Fiber Testing Standards

1. Craft Yarn Council (CYC) Integration

All categories on YarnYardCalc (#0 Lace through #7 Jumbo) adhere to the standardized guidelines published by the Craft Yarn Council. We regularly verify our linear-density estimates against commercial skein ball bands from major international yarn manufacturers.

2. Scale Testing & Density Verification

To ensure accurate yardage predictions, our fiber laboratory calibrates kitchen and jewelry scales to 0.1-gram precision. We measure average length per gram ($yds/g$) across:

• 100% Superwash Merino and Non-Superwash Wool
• 100% Cotton (Mercerized and Unmercerized Kitchen Cotton)
• 100% Premium and Budget Acrylic Fibers
• Chenille and Polyester Blanket Core Yarns

3. The 10% Safety Factor

In our blanket and sweater estimators, we deliberately engineer a 10% safety margin into every project calculation. This accounts for:

• 4" × 4" gauge swatch yarn consumption
• Tails consumed when casting on, binding off, and joining new skeins
• Slight variations in maker hand tension from start to finish

4. Correction Policy

If you identify any technical calculation discrepancy or find that a specific indie yarn base consistently deviates from our ratios, please submit your findings to editorial@yarnyardcalc.com with your yarn brand, full skein weight, and yardage.