Apparel SizeShoe Size

EU to JP (cm) Shoe Size for Unisex

Snapshot

40 EU size equals 25.5 JP (cm) 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 cm cohort as the profile basis.
Example: For 37 EU size, the cm cohort returns 23.5 JP (cm) 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

25.5 JP (cm) size

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Machine access

Available to apps and AI agents

EU to JP (cm) Shoe Size for Unisex can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The unisex cohort identifies the sizing system used by the conversion.

Machine-readable identifiers

Conversion family: shoe-size
Source unit: eu
Target unit: jp-centimeters
Cohort: unisex

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": 40,
  "from": "eu",
  "to": "jp-centimeters",
  "parameters": {
    "cohort": "unisex"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "shoe-size",
    "value": 40,
    "from": "eu",
    "to": "jp-centimeters",
    "result": {
      "raw": 25.666668,
      "display": "25.5"
    },
    "canonicalPath": "/apparel-size/shoe-size/eu-to-jp-centimeters-for-unisex/"
  }
}

Full API documentation

Explanation

EU converts to JP (cm) by first mapping EU to millimeters, then mapping millimeters to JP (cm). Cohort profile fixed: Unisex.

For EU size to JP (cm) size, the active cm 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: cm cohort.
Consistency rule: calculator output and table values keep the same shoe-size cohort in both directions.

Common Conversion Values

EU size	JP (cm) size
37	23.5
39	25
40	25.5
42	27
43	27.5

Questions & answers

Frequently Asked Questions

Is the reverse shoe-size direction available?

Yes. The mirror page JP (cm) to EU (Unisex) uses the inverse mapping path.

Which shoe-size cohort is used for EU to JP (cm)?

Unisex sizing is fixed for this shoe-size mapping.

How is EU size to JP (cm) size calculated?

The converter applies the formula defined for EU size to JP (cm) size, then renders rounded output for the direct answer and common-value rows.