Apparel SizeShoe Size

BR to AU Shoe Size for Men

Snapshot

38 BR size equals 6.5 AU 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 35 BR size, the selected cohort cohort returns 4 AU 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

6.5 AU size

Switch

Machine access

Available to apps and AI agents

BR to AU Shoe Size for Men can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The men cohort identifies the sizing system used by the conversion.

Machine-readable identifiers

Conversion family: shoe-size
Source unit: br
Target unit: au
Cohort: men

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": 38,
  "from": "br",
  "to": "au",
  "parameters": {
    "cohort": "men"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "shoe-size",
    "value": 38,
    "from": "br",
    "to": "au",
    "result": {
      "raw": 6.42519801476,
      "display": "6.5"
    },
    "canonicalPath": "/apparel-size/shoe-size/br-to-au-for-men/"
  }
}

Full API documentation

Explanation

BR converts to AU by first mapping BR to millimeters, then mapping millimeters to AU. Cohort profile fixed: Men.

For BR size to AU 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

BR size	AU size
35	4
37	5.5
38	6.5
40	8
41	9

Questions & answers

Frequently Asked Questions

Is the reverse shoe-size direction available?

Yes. The mirror page AU to BR (Men) uses the inverse mapping path.

Which shoe-size cohort is used for BR to AU?

Men sizing is fixed for this shoe-size mapping.

How is BR size to AU size calculated?

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