Apparel SizeShoe Size

US to CN Shoe Size for Women

Snapshot

7.5 US size equals 39 CN size. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This result uses the selected selected cohort cohort as the profile basis.
Example: For 5 US size, the selected cohort cohort returns 34.5 CN size under the same mapping assumptions.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

39 CN size

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Machine access

Available to apps and AI agents

US to CN Shoe Size for Women can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The women cohort identifies the sizing system used by the conversion.

Machine-readable identifiers

Conversion family: shoe-size
Source unit: us
Target unit: cn
Cohort: women

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "shoe-size",
  "value": 7.5,
  "from": "us",
  "to": "cn",
  "parameters": {
    "cohort": "women"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "shoe-size",
    "value": 7.5,
    "from": "us",
    "to": "cn",
    "result": {
      "raw": 38.9200005,
      "display": "39"
    },
    "canonicalPath": "/apparel-size/shoe-size/us-to-cn-for-women/"
  }
}

Full API documentation

Explanation

US converts to CN by first mapping US to millimeters, then mapping millimeters to CN. Cohort profile fixed: Women.

For US size to CN size, the active selected cohort cohort determines the conversion constants applied to every value.

Keep the same cohort in both directions to avoid mixing shoe-size systems that use different wearer-group mappings.

Method & Size Mapping

Model basis: output depends on the selected shoe-size cohort and follows the same cohort mapping in both directions.
Profile reference: selected cohort cohort.
Consistency rule: calculator output and table values keep the same shoe-size cohort in both directions.

Common Conversion Values

US size	CN size
5	34.5
6.5	37
7.5	39
8.5	40.5
10	43

Questions & answers

Frequently Asked Questions

Is the reverse shoe-size direction available?

Yes. The mirror page CN to US (Women) uses the inverse mapping path.

Which shoe-size cohort is used for US to CN?

Women sizing is fixed for this shoe-size mapping.

What formula is used for US size to CN size?

The converter applies the formula defined for US size to CN size, then renders rounded output for the direct answer and common-value rows.