Shoe Size Converter API

GET

Match shoe sizes across international sizing standards for men, women, and children.

Shoe Size Converter translates footwear measurements across regional standards, including US, UK, Australian, Mexican, and Korean sizing systems. Provide a size, source region, and gender category to get equivalent sizes, with paid plans adding European, Japanese, and centimeter measurements.

Try it — live request, no key required

Request

GETapi.apiverve.com/v1/shoesizeconverter?size=9&from=us

Query parameters

sizestring

fromstring

Verification

Format

No key required to try it. Get a key to use it in your app.

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "input_size": 9,
    "input_region": "US",
    "gender": "men",
    "conversions": {
      "cm": 29.1,
      "jp": 29.1,
      "us": 9,
      "uk": 8.1,
      "au": 8.1,
      "eu": 43.7,
      "mx": 13.7,
      "kr": 43.7
    },
    "note": "Sizes are approximate and may vary by manufacturer"
  }
}

About the Shoe Size Converter API

Shoe Size Converter works by converting the input size to centimeters as a base measurement, then calculating equivalent sizes in all supported regions. Returns conversions for all international standards simultaneously.

What people use it for

E-commerce: Help international customers find their correct shoe size when shopping from different countries
Travel Planning: Convert shoe sizes when shopping abroad or purchasing from international retailers
Size Charts: Generate comprehensive size charts for footwear products with multiple regional standards
Retail Apps: Integrate size conversion features into shopping apps to improve customer experience

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON: Default REST response
XML: Markup format
YAML: Human-readable
CSV: Tabular export
GraphQL: Query language
MCP: For AI agents

View all integrations →

Other ways to use Shoe Size Converter

Same data, same APIVerve account, same credit balance — one key works on all of them.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.on VerveKit Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.on VerveSheets Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.on VerveContext

Questions.

Common questions about the Shoe Size Converter API.

Read the docs →

Which sizing standards and regions are supported?

The API converts across eight regional standards: US, UK, AU, MX, and KR work on every plan; EU, CM, and JP require a paid plan. It handles men, women, unisex, and children categories, returning all regional equivalents in a single request.

What would 25,000 size conversions a month cost me?

It fits easily inside the Starter plan, which provides 200,000 credits for 100,000 conversions at 2 credits per call. A monthly volume of 25,000 calls uses one-quarter of your credits and works out to about $0.30 per 1,000 calls. The Free plan gives you 100 conversions every month.

Are EU and Japanese shoe sizes included on the Free plan?

No, EU shoe sizes, Japanese sizes, and centimeter measurements are premium fields. The Free plan returns US, UK, AU, MX, and KR equivalents. Upgrading to any paid plan unlocks full access to all eight standards.

Does the converter handle both adult and children's shoes?

Yes. Sizing conversions cover men, women, unisex, and child sizes. Specifying the gender parameter in your request ensures the right regional scale is applied to the conversion.

Can I use these conversions on my e-commerce storefront?

Yes, provided you subscribe to a paid plan. Commercial use is permitted on all paid tiers, allowing you to show converted shoe sizes on your product detail and checkout pages. You may not resell or redistribute the underlying data directly.

Request parameters — GET /v1/shoesizeconverter

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Required

Parameter	Type	Example	Description
`size`Required	string	`9`	The shoe size to convert
`from`Required	string	`us`	Source region `usukeucmjpaumxkr`

Optional

Parameter	Type	Example	Description
`gender`Optional	string	`men`	Gender sizing `menwomenunisexchild` default unisex

Example request

1
2

curl "https://api.apiverve.com/v1/shoesizeconverter?size=9&from=us&gender=men" \
  -H "x-api-key: YOUR_API_KEY"

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Header	When	Value
`x-api-key`Required	Every request	Your API key. Header names are case-insensitive, so `X-API-Key` is the same header.
`Authorization`Alternate	Instead of the above	`Bearer <key>` — for clients that only expose bearer auth. Resolves to the same account and the same billing.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Response — GET /v1/shoesizeconverter

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "input_size": 9,
    "input_region": "US",
    "gender": "men",
    "conversions": {
      "cm": 29.1,
      "jp": 29.1,
      "us": 9,
      "uk": 8.1,
      "au": 8.1,
      "eu": 43.7,
      "mx": 13.7,
      "kr": 43.7
    },
    "note": "Sizes are approximate and may vary by manufacturer"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`input_size`	number	`9`	The size that was supplied
`input_region`	string	`"US"`	Sizing system the input was given in
`gender`	string	`"men"`	Gender sizing used for conversion
`conversions`	object	`{...}`	The equivalent size in every supported sizing system
`cm`Premium	number	`29.1`	Size in centimeters
`jp`Premium	number	`29.1`	Japanese shoe size
`us`	number	`9`	US shoe size
`uk`	number	`8.1`	UK shoe size
`au`	number	`8.1`	Equivalent Australian size
`eu`Premium	number	`43.7`	EU shoe size
`mx`	number	`13.7`	Equivalent Mexican size
`kr`	number	`43.7`	Equivalent Korean size, in millimetres
`note`	string	`"Sizes are approximate and may vary by manufacturer"`	Caveat that sizes are approximate and vary by manufacturer

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Header	What it carries
`x-api-remaining-credits`	Credits left in the current cycle
`x-api-credits-used`	Credits spent in the current cycle
`x-api-max-credits`	The allowance for the cycle
`x-api-version`	Version of the endpoint that answered

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter that has to change.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted here	A key restriction or an IP allow-list — never a bad key.
`429`	Rate limited, or out of credits	Read `error` to tell them apart, then back off or top up.

What a call costs — 2 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Plan	Per month	Credits	Shoe Size Converter calls	Per 1,000 calls
Free	Free	200	100	Free
Starter	$29.99	200,000	100,000	$0.30
Pro	$99.99	1,000,000	500,000	$0.20
Mega	$299.99	4,000,000	2,000,000	$0.15

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Compare all pricing tiers →

Call it from cURL — GET /v1/shoesizeconverter

No SDK to install — this is a plain HTTPS call to /v1/shoesizeconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

cURL

1
2

curl "https://api.apiverve.com/v1/shoesizeconverter" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/shoesizeconverter-apiSource, issues and the examples this page is built from.ReferenceShoe Size Converter API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/shoesizeconverternpm APIVerve.API.ShoeSizeConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Node.js — GET /v1/shoesizeconverter

Install the Node.js SDK, then call the Shoe Size Converter API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — npm

npm install @apiverve/shoesizeconverter

Node.js

const res = await fetch("https://api.apiverve.com/v1/shoesizeconverter", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Resources

npm@apiverve/shoesizeconverterThe published Node.js client, versioned and signed.GitHubapiverve/shoesizeconverter-apiSource, issues and the examples this page is built from.ReferenceShoe Size Converter API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

APIVerve.API.ShoeSizeConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Python — GET /v1/shoesizeconverter

No SDK to install — this is a plain HTTPS call to /v1/shoesizeconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

Python

import requests

res = requests.get(
    "https://api.apiverve.com/v1/shoesizeconverter",
    headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])

Resources

Also published for

@apiverve/shoesizeconverternpm APIVerve.API.ShoeSizeConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from C# / .NET — GET /v1/shoesizeconverter

Install the C# / .NET SDK, then call the Shoe Size Converter API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — NuGet

dotnet add package APIVerve.API.ShoeSizeConverter

C# / .NET

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

var json = await client.GetStringAsync("https://api.apiverve.com/v1/shoesizeconverter");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.ShoeSizeConverterThe published C# / .NET client, versioned and signed.GitHubapiverve/shoesizeconverter-apiSource, issues and the examples this page is built from.ReferenceShoe Size Converter API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/shoesizeconverternpm

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Go — GET /v1/shoesizeconverter

No SDK to install — this is a plain HTTPS call to /v1/shoesizeconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/shoesizeconverter", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")

res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Resources

Also published for

@apiverve/shoesizeconverternpm APIVerve.API.ShoeSizeConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from PHP — GET /v1/shoesizeconverter

No SDK to install — this is a plain HTTPS call to /v1/shoesizeconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

PHP

$ch = curl_init("https://api.apiverve.com/v1/shoesizeconverter");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);

$response = curl_exec($ch);
echo $response;

Resources

Also published for

@apiverve/shoesizeconverternpm APIVerve.API.ShoeSizeConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Ruby — GET /v1/shoesizeconverter

No SDK to install — this is a plain HTTPS call to /v1/shoesizeconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

Ruby

require "net/http"

uri = URI("https://api.apiverve.com/v1/shoesizeconverter")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.body

Resources

Also published for

@apiverve/shoesizeconverternpm APIVerve.API.ShoeSizeConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

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Shoe Size Converter API

Try it — live request, no key required

About the Shoe Size Converter API

What people use it for

Ways to call it

Other ways to use Shoe Size Converter

Questions.

Request parameters — GET /v1/shoesizeconverter

Required

Optional

Authentication

Response — GET /v1/shoesizeconverter

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — GET /v1/shoesizeconverter

Resources

Also published for

Call it from Node.js — GET /v1/shoesizeconverter

Resources

Also published for

Call it from Python — GET /v1/shoesizeconverter

Resources

Also published for

Call it from C# / .NET — GET /v1/shoesizeconverter

Resources

Also published for

Call it from Go — GET /v1/shoesizeconverter

Resources

Also published for

Call it from PHP — GET /v1/shoesizeconverter

Resources

Also published for

Call it from Ruby — GET /v1/shoesizeconverter

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — Shoe Size Converter API

Reference Data

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