Ring Size Converter
Convert ring size with this free online tool
Ring Size Converter
Convert ring sizes between US, UK, EU, Japan, and ISO standards
Ring Size Conversion Table
| US | UK | EU | JP | Circ. (mm) | Dia. (mm) |
|---|---|---|---|---|---|
| 3 | F | 44 | 4 | 44.2 | 14.1 |
| 3.5 | G | 45 | 5 | 45.5 | 14.5 |
| 4 | H | 46 | 7 | 46.8 | 14.9 |
| 4.5 | I | 47 | 8 | 48 | 15.3 |
| 5 | J | 48 | 9 | 49.3 | 15.7 |
| 5.5 | K | 50 | 10 | 50.6 | 16.1 |
| 6 | L | 51 | 11 | 51.9 | 16.5 |
| 6.5 | M | 52 | 13 | 53.1 | 16.9 |
| 7 | N | 53 | 14 | 54.4 | 17.3 |
| 7.5 | O | 54 | 15 | 55.7 | 17.7 |
| 8 | P | 55 | 16 | 57 | 18.1 |
| 8.5 | Q | 56 | 17 | 58.2 | 18.5 |
| 9 | R | 57 | 18 | 59.5 | 18.9 |
| 9.5 | S | 58 | 19 | 60.8 | 19.4 |
| 10 | T | 60 | 20 | 62.1 | 19.8 |
| 10.5 | U | 61 | 22 | 63.3 | 20.2 |
| 11 | V | 62 | 23 | 64.6 | 20.6 |
| 11.5 | W | 63 | 24 | 65.9 | 21 |
| 12 | X | 64 | 25 | 67.2 | 21.4 |
| 12.5 | Y | 65 | 26 | 68.5 | 21.8 |
| 13 | Z | 66 | 27 | 69.7 | 22.2 |
A free online ring size converter that works instantly in your browser. No registration, no limits — just enter your values and get results.
Key Features
Instant ring size converter conversions
Supports multiple input formats
Batch conversion capability
Copy results with one click
No installation needed
100% free online converter
How to Use Ring Size Converter
Enter Your Data
Input your values or data into the ring size converter tool fields
Configure Options
Adjust any optional settings or parameters for your specific needs
Get Instant Results
The tool automatically calculates and displays results in real-time
Copy or Export
Copy the results to clipboard or use them directly in your project
Repeat as Needed
Run the tool again with different inputs — unlimited usage, completely free
Use Cases
Use ring size converter for personal projects
Professional and academic applications
Quick reference and verification
Everyday productivity and convenience
Frequently Asked Questions
Is the Ring Size Converter free to use?
Yes, the Ring Size Converter is completely free with no registration required. Use it as many times as you need.
Do I need to create an account?
No account needed. All tools work instantly in your browser without any signup or login.
Is my data safe?
Absolutely. All processing happens locally in your browser. Your data is never sent to any server.
Does the Ring Size Converter work on mobile?
Yes, the tool is fully responsive and works on phones, tablets, and desktop computers.
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