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Jewelry Maker Calc – Ring Size Converter
x402
Jewelry Maker Calc – Ring Size Converter is a paid API for AI agents from jewelry-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Converts a ring size among US, EU (ISO circumference), UK letter, inside diameter, and circumference in both mm and inches.
Price / call$0.02
Success—
StatusUnknown
How this service works
Convert a ring size between US, EU (ISO circumference), UK letter, inside diameter and circumference in mm and inches.
Output
Returns a comprehensive size object with the equivalent ring size in all major systems: US size (decimal and nearest quarter), EU/ISO size (circumference in mm), UK letter, inside diameter in mm and inches, inside circumference in mm and inches, and mm per full US size increment. Also includes a summary, disclaimer, and any degraded/partial result flags.
Example use cases
Buying a ring from a European jeweler
“I wear a US size 6.5 ring and I need to order from a German jewelry site that uses EU sizes — what's my EU size and inside diameter in mm?”
Converting a ring measured with a string
“I measured my finger circumference as 57mm — can you tell me what that is in US ring size, EU size, and UK letter?”
Gift shopping with only UK size known
“My partner's ring box says size P UK — can you convert that to US and EU sizes so I can order from an American jeweler?”
Technical details
Endpoint
GEThttps://jewelry-calc.x402tookit.com/ring-size?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically convert ring sizes across US, EU, UK, diameter, and circumference systems — especially when helping users shop internationally, manufacturing jewelry, or interpreting measurements from a physical ring. It is purpose-built for ring size conversion with full multi-system output in a single call, making it more efficient than generic unit converters or manual ring size charts.
Side effects
- Missing required input: no query parameter provided — returns an error or empty/null result
- Out-of-range US size (below 0 or above 16) — may return null or an invalid result
- Non-numeric or malformed parameter value — request fails with a validation error
- Ambiguous input if multiple size parameters are provided simultaneously — only one should be used
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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