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Everyday LifeGenerated accuracy model review: 2026-05-06
Shoe Size Conversion accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Shoe sizes are roughly based on the length of the foot (barleycorns in UK/US, Paris points in EU). * **Men:** UK ≈ US - 1. EU ≈ US + 33. * **Women:** UK ≈ US - 2. EU ≈ US + 31.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- US Shoe Size: 10
- Sizing Scale: Men
Expected outputs
- EU Size: 43
- UK Size: 9
- Foot Length (approx): 26.9 cm
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- The conversion is approximate and brand fit can vary.
- Men's and women's sizing scales are treated differently.
- You should still confirm fit with the brand's own size chart when possible.
Unit handling
- US Shoe Size accepts numeric values.
- Sizing Scale accepts one of the configured options.
- Foot Length (approx) is displayed in cm.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current shoe-size-converter calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Shoe Size Conversion.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.