Apparel SizeShoe Size

CN to UK Shoe Size for Kids

Snapshot

33 CN size equals 5.5 UK 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 29 CN size, the selected cohort cohort returns 3 UK 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

5.5 UK size

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Machine access

Available to apps and AI agents

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

Machine-readable identifiers

Conversion family: shoe-size
Source unit: cn
Target unit: uk
Cohort: kids

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": 33,
  "from": "cn",
  "to": "uk",
  "parameters": {
    "cohort": "kids"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "shoe-size",
    "value": 33,
    "from": "cn",
    "to": "uk",
    "result": {
      "raw": 5.49606273638,
      "display": "5.5"
    },
    "canonicalPath": "/apparel-size/shoe-size/cn-to-uk-for-kids/"
  }
}

Full API documentation

Explanation

CN converts to UK by first mapping CN to millimeters, then mapping millimeters to UK. Cohort profile fixed: Kids.

From CN size to UK size, results depend on the selected selected cohort 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: selected cohort cohort.
Consistency rule: calculator output and table values keep the same shoe-size cohort in both directions.

Common Conversion Values

CN size	UK size
29	3
31	4.5
33	5.5
35	6.5
37	8

Questions & answers

Frequently Asked Questions

Is the reverse shoe-size direction available?

Yes. The mirror page UK to CN (Kids) uses the inverse mapping path.

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

Kids sizing is fixed for this shoe-size mapping.

How does this converter compute CN size to UK size?

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