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| Decision field | Open accessHook & Needle Diameter ReferenceGlobalRemove | Open accessPattern Grading & Size-Run Validation RecordGlobalRemove | Open accessSeam Allowance ConverterGlobalRemove |
|---|---|---|---|
| Decision fit | |||
| Primary job | Learn techniques | Find patterns & fit | Find patterns & fit |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Yarn | Patterns & fit | Patterns & fit |
| Best for | Checking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gauge | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence | Translating a seam allowance already stated by a pattern or controlled specification |
| Know before using | The reference is not a dimensional measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, gauge result, or proof that a proposed tool will produce the required fabric. | The record does not create a production grade, supply universal increments or breakpoints, validate a CAD file or fit population, reproduce licensed standards, or replace qualified anthropometric, pattern, technical-design, fit, quality, accessibility, safety, statistical, and user-research review. | This is a unit-translation reference. It does not select, approve, or change a seam allowance; establish a universal fraction; interpret an unstated cutting or stitching line; or replace the exact pattern version, controlled specification, material and seam evidence, sample, production method, equipment, tolerance, or release authority. |
| Practical access | |||
| For | Makers | Apparel brands | Both |
| Location or jurisdiction | Global | Global | Global |
| Access | Open access | Open access | Open access |
| Format | Stitch Authority | Stitch Authority | Stitch Authority |
| Source type | Stitch Authority | Stitch Authority | Stitch Authority |
| Source and review | |||
| What the source establishes | Rechecked July 27, 2026. The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows and follows the Council's warning that company letter and number labels vary; blank aliases remain blank instead of being inferred. | The guide cites current ISO body-table, size-designation, and garment-measurement boundaries plus two peer-reviewed studies that tested the relationship between conventional grade rules, anthropometric evidence, and garment fit; it requires product-specific target deltas and validation instead of publishing universal increments. | NIST states that one inch is exactly 25.4 millimetres, and the SI decimal relationship makes one centimetre equal to 10 millimetres. The tool uses those factors, displays rounded equivalents, exposes the size difference to the nearest 1/16 inch when converting to inches, and preserves valid value, source-unit, and target-unit state in the URL. |
| Linked page reviewed | Jul 27, 2026 | Jul 27, 2026 | Jul 28, 2026 |
| Next review due | Jul 27, 2027 | Jul 27, 2027 | Jul 28, 2027 |
| Inspect | |||
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