Editorial Policy & Standards

1. Mission and Authoring Principles

Yarnivo exists to provide clear, formula-based planning tools and practical craft guidance to crocheters. Much of the crochet sizing information online relies on rules of thumb or generic charts that ignore individual gauge and pattern repeat structure.

Every guide and calculator on Yarnivo follows three governing principles:

1. Direct Practical Utility: We focus on solving specific planning problems—how to scale gauge measurements, how to fit pattern repeats after subtracting borders, how to space single-row increases or decreases, and how to estimate yarn from a weighed swatch.
2. Show the Underlying Formulas: Rather than giving an isolated number, each tool and guide displays the step-by-step arithmetic so crafters can see how the estimate was produced.
3. Respect Pattern Autonomy: We never guess missing pattern specifications (such as turning chain offsets or border stitch density). When a value depends on the designer’s pattern, the tool explicitly prompts you to enter it.

2. How Calculation Logic Is Developed and Checked

All calculators on Yarnivo—including our Gauge Calculator, Blanket Starting-Chain Calculator, Stitch-Repeat Calculator, and Increase/Decrease Calculator—are implemented as self-contained TypeScript calculation modules.

Our software quality checks include:

• Automated Unit Test Suites: We maintain automated unit tests using Vitest covering boundary conditions, negative or non-integer input rejection, decimal rounding, and unit conversion consistency.
• Row Stitch Balance Checks: For single-row stitch count increases and decreases, the calculation module sums every source stitch consumed and every target stitch produced across all instruction groups to confirm that totalConsumed === N and totalProduced === T.
• Separate 10cm and 4-Inch Normalizations: Because 4 inches equals 10.16 cm (not 10.0 cm), our calculators compute metric (per 10 cm) and imperial (per 4 in) gauge separately.
• Standard Unit Conversion Factors: All unit conversions use standard international definitions: 1 in = 2.54 cm, 1 yd = 0.9144 m, and 1 oz = 28.349523125 g.

3. Source Selection and Technical Citations

When referencing craft standards and measurement definitions, we cite established organizations:

• Craft Yarn Council (CYC): Our Standard Yarn Weight Chart and US vs UK Terminology Table follow published Craft Yarn Council standards (Categories 0 Lace through 7 Jumbo, wraps per inch, recommended hook ranges, and US/UK abbreviation tables).
• National Institute of Standards and Technology (NIST): Length and mass conversion factors in our Crochet Unit Converter follow NIST Special Publication 811 definitions.

4. Content Creation & Honest Use of AI Assistance

We maintain full transparency regarding how our guides, calculators, and reference materials are developed:

• Editorial Review of Formulas and Copy: Initial drafts and code scaffolding may involve AI-assisted developer and drafting tools. All published formulas, worked examples, and reference tables are checked against unit tests and published industry standards before publication.
• No Fabricated Staff or Credentials: We do not claim an extensive staff of craft editors, specialized committees, or dedicated engineering departments. Yarnivo is operated by its independent publisher, Hapad Ltd.. We do not invent author personas, degrees, or fabricate claims of personal physical crafting experience.
• Strict Ban on AI Crochet Photography: We never generate photorealistic AI images of crochet blankets, garments, or swatches to claim they were physically hand-crocheted or blocked. All diagrams on Yarnivo are original vector SVGs designed to explain geometry and stitch intervals clearly.
• Zero Fabricated Social Proof: We never invent fake user testimonials, five-star reviews, celebrity endorsements, or fabricated download counters.

5. Honest Authorship & Worked Examples

We publish under the organizational byline "Yarnivo Editorial" (operated by Hapad Ltd.).

When we present worked examples on our Worked Examples page, tool pages, or guides, we clearly label them as Worked examples—hypothetical mathematical walkthroughs designed to explain sizing formulas, repeat rounding, and swatch-based yarn estimation. They are not claims that a physical garment or blanket was hand-crocheted, blocked, or wear-tested.

6. Corrections and Update Protocol

If you notice any typographical error, broken link, or calculation issue:

1. Submit details with the page URL, input values, and your observation via our Contact page or support email.
2. We check the report against our unit test suites and reference sources.
3. When an issue is confirmed, we update the calculation code or explanatory text, run the test suite, and deploy the fix.
4. We update the page modification date when substantive changes are made.

7. Contact Information

For editorial inquiries, technical corrections, or suggestions for craft tools, please contact: