Shoe size conversion (US/UK/EU/JP/cm) API

Convert a shoe size between US, UK, EU, JP, and foot length in cm for men or women, returning the nearest equivalent across all systems plus the cm foot length. Men's and women's grids differ, so the cross-region alignment is the value-add. Answers 'what is men's US 9 in EU', 'convert UK 7 women's to US', 'EU 42 in cm', 'shoe size in Japanese sizing'.

Price$0.01per request

MethodPOST

Route/v1/ref/shoe-size

StatusLive

MIME typeapplication/json

Rate limit60/minute

CacheNo cache

refshoe-sizesize-conversionfootwearshoesuseucm

API URLhttps://x402.hexl.dev/v1/ref/shoe-size

Integration docs

Example request

{
  "size": 9,
  "region": "US",
  "sex": "men"
}

Example response

{
  "size": 9,
  "region": "US",
  "sex": "men",
  "exact": true,
  "conversions": {
    "US": 9,
    "UK": 8.5,
    "EU": 42.5,
    "JP": 27,
    "CM": 27
  },
  "footLengthCm": 27
}

Input schema

{
  "type": "object",
  "required": [
    "size"
  ],
  "properties": {
    "size": {
      "type": [
        "string",
        "number"
      ],
      "examples": [
        9
      ]
    },
    "region": {
      "type": "string",
      "enum": [
        "US",
        "UK",
        "EU",
        "JP",
        "CM"
      ],
      "examples": [
        "US"
      ]
    },
    "sex": {
      "type": "string",
      "enum": [
        "men",
        "women"
      ],
      "examples": [
        "men"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}