Apparel SizeShoe Size

Foot Length (in) to CN Shoe Size for Women

Snapshot

9.75 Foot Length (in) size equals 39.5 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 in cohort as the profile basis.
Example: For 8.75 Foot Length (in) size, the in 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

39.5 CN size

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Machine access

Available to apps and AI agents

Foot Length (in) 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: foot-length-inches
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": 9.75,
  "from": "foot-length-inches",
  "to": "cn",
  "parameters": {
    "cohort": "women"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "shoe-size",
    "value": 9.75,
    "from": "foot-length-inches",
    "to": "cn",
    "result": {
      "raw": 39.53,
      "display": "39.5"
    },
    "canonicalPath": "/apparel-size/shoe-size/foot-length-inches-to-cn-for-women/"
  }
}

Full API documentation

Explanation

Foot Length (in) converts to CN by first mapping Foot Length (in) to millimeters, then mapping millimeters to CN. Cohort profile fixed: Women.

From Foot Length (in) size to CN size, results depend on the selected in cohort and stay consistent with that cohort across table rows and calculator input.

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: in cohort.
Consistency rule: calculator output and table values keep the same shoe-size cohort in both directions.

Common Conversion Values

Foot Length (in) size	CN size
8.75	34.5
9.25	37
9.75	39.5
10	41
10.5	43.5

Questions & answers

Frequently Asked Questions

Is the reverse shoe-size direction available?

Yes. The mirror page CN to Foot Length (in) (Women) uses the inverse mapping path.

Which shoe-size cohort is used for Foot Length (in) to CN?

Women sizing is fixed for this shoe-size mapping.

What formula is used for Foot Length (in) size to CN size?

The converter applies the formula defined for Foot Length (in) size to CN size, then renders rounded output for the direct answer and common-value rows.