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| Decision field | Open accessSeam Allowance ConverterGlobalRemove | Open accessFreeSewingGlobalRemove | Open accessNMSU Pattern Alteration GuideUnited States · North AmericaRemove |
|---|---|---|---|
| Decision fit | |||
| Primary job | Find patterns & fit | Find patterns & fit | Find patterns & fit |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Patterns & fit | Patterns & fit | Patterns & fit |
| Best for | Translating a seam allowance already stated by a pattern or controlled specification | Custom-fit home sewing patterns | Checking a common flat-pattern alteration method |
| Know before using | 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. | A generated pattern is not independent fit evidence or a production-ready graded block. The result still depends on accurate measurements, the selected design and options, ease assumptions, fabric behavior, construction, and representative test garments. An account stores saved patterns and measurement sets, so review the platform's privacy terms before retaining personal measurements. | The guide's general womenswear diagrams and ease ranges are teaching examples, not an individual diagnosis, current commercial-pattern specification, or complete fitting course. A named symptom can have several causes, and alterations may affect adjoining seams, facings, collars, sleeves, balance, and style. Verify the method against the exact pattern and test the coordinated changes on a muslin. |
| Practical access | |||
| For | Both | Makers | Makers |
| Location or jurisdiction | Global | Global | United States · North America |
| Access | Open access | Open access | Open access |
| Format | Stitch Authority | Software | Reference |
| Source type | Stitch Authority | Open-source project | Government guidance |
| Source and review | |||
| What the source establishes | 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. | FreeSewing's official documentation says the browser editor drafts a selected design in real time from a measurement set rather than scaling or grading a standard-size pattern. Users can adjust design options and export the generated result, including as PDF; saving the pattern to an account is optional and is used to revisit it later. | New Mexico State University's current Cooperative Extension Guide C-228 explains three alteration methods, folding out fullness, slashing and spreading or overlapping, and redrawing darts or seams. It provides illustrated bodice, sleeve, skirt, and trouser examples and tells readers to compare body measurements plus intended ease with the pattern while preserving grain, design lines, related-piece changes, and comfort ease. |
| Linked page reviewed | Jul 28, 2026 | Jul 21, 2026 | Jul 21, 2026 |
| Next review due | Jul 28, 2027 | Jan 17, 2027 | Oct 19, 2026 |
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