Apparel SizeShoe Size

Foot Length (in) to US Shoe Size for Unisex

Snapshot

10.25 Foot Length (in) size equals 8 US 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 9.5 Foot Length (in) size, the in cohort returns 5.5 US 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

8 US size

Switch

Machine access

Available to apps and AI agents

Foot Length (in) to US 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: foot-length-inches
Target unit: us
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": 10.25,
  "from": "foot-length-inches",
  "to": "us",
  "parameters": {
    "cohort": "unisex"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "shoe-size",
    "value": 10.25,
    "from": "foot-length-inches",
    "to": "us",
    "result": {
      "raw": 7.86023591101,
      "display": "8"
    },
    "canonicalPath": "/apparel-size/shoe-size/foot-length-inches-to-us-for-unisex/"
  }
}

Full API documentation

Explanation

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

For Foot Length (in) size to US size, the active in 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: 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	US size
9.5	5.5
9.75	6.5
10.25	8
10.75	9.5
11	10

Questions & answers

Frequently Asked Questions

Is the reverse shoe-size direction available?

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

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

Unisex sizing is fixed for this shoe-size mapping.

How does this converter compute Foot Length (in) size to US size?

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