US women's shoe size to cm and JP size
Handy for ordering from Korean and Japanese stores that list women's sizes by foot length.
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How to use it
- Enter us women's size.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Foot length (in) = (US women's + 20.5) ÷ 3, then JP size = foot length (cm), with 1 in = 2.54 cm. The JP size is rounded to the nearest 0.5 cm and the KR and CN size to the nearest 5 mm, following the ISO/TS 19407 formulas.
Example
Inputs: US women's size = 8. Result: JP size (cm): 24 cm; Exact value before rounding: 24.13 cm; KR and CN size: 240 mm.
Limits and caveats
- Brands and models can differ from this chart by up to one size, so check the brand's own chart when you have it.
- Based on the ISO/TS 19407 formulas; US women's sizes follow the common scale (men's + 1.5).
- Foot width and shape are not taken into account.
Questions about this tool
What is US women's 8 in cm?
It is JP 24 cm using the ISO/TS 19407 formulas; the exact value before rounding is 24.13.
Why does a brand's chart differ from this US women's to foot length in cm result?
Each brand rounds its sizes and builds its lasts its own way, so its chart can be up to one size off. Measuring your foot in cm is the most reliable check.
Can I order from Korean shops with this?
Yes: use the mm value, such as 240 mm, which is what Korean shops list. If your foot falls between two steps, pick the larger one.