Convert Any Ring Size

Ring Size Conversion Tool

Finding the perfect ring size should never be a guessing game. Especially when shopping online or for someone in another country. Whether you’re buying an engagement ring, a wedding band, or a stylish statement piece, knowing your exact ring size is crucial for comfort and peace of mind. That’s why our Ring Size Conversion Tool is here to take out all the confusion, allowing you to easily convert ring sizes between different standards and measurements like millimeters, inches, US, EU/ISO, East Asian/South American, and Italian/Spanish/Swiss systems.

Ring Size Converter

Size to convert:

From:

To:

Size Charts: US | EU / ISO | UK | East Asia | Italy

Effortlessly Calculate US, EU, East Asian, Italian & International Ring Sizes

Why Are Ring Sizes So Complicated?

Ring sizes vary dramatically around the world. What’s a size 7 in the US might be a size 54 in Europe, a size 14 in Japan, or a size 17 in Switzerland. There are two main reasons for this confusion:

Different Numbering Systems: Each region has developed its own way of numbering and measuring ring sizes.
Varied Measurement Units: Some countries use circumference (mm or inches), others use diameter, and some simply have their unique number systems.

How Our Ring Size Conversion Tool Works

Our free, online Ring Size Calculator makes translating between different size standards easy and accurate. Here’s how you can use it:

Type in Your Current Ring Size and Scale/Unit: Choose the measurement you know. Maybe it’s in millimeters, US size, or European (ISO).
Choose Your Desired Conversion System: Instantly see your ring size across multiple systems:
- US/Canada (e.g., Size 7)
- UK/Australia/New Zealand (e.g., Size N)
- EU/ISO (e.g., Size 54)
- East Asia/South America (e.g., Japanese 14, Brazilian 17)
- Italian/Spanish/Swiss/Indian (e.g., Size 14)
Switch Between Units: Easily convert between inner circumference (mm/inches) and standardized ring sizes.

Example Conversions Using the Tool

US to EU: If your ring is a US size 7, the tool will show that this equals an EU size 54.
EU to mm: Entering EU size 54, you’ll find it corresponds to an inner circumference of 2.1 inches.
mm to UK/AU: Measure the inside circumference 55.6m of a ring (let’s say 56 mm), and discover it’s approximately a UK size O or a US size 7.5.
US to Japanese: A US size 6 converts to a Japanese size 12.
Brazilian to US: Brazilian ring sizes are unique. For example, a Brazilian size 17 is roughly a US size 7.

Why Use a Ring Size Converter?

1. Shop Internationally With Confidence

Global jewelry brands often list sizes in their local system. Our tool helps you order the correct size from anywhere in the world.

2. Gift Shopping Made Easy

Buying a ring for someone overseas? Use our tool to convert their ring size to the standard used in your country or by your favorite jeweler.

3. DIY Measurement

Not sure of your ring size? Measure the inner circumference of a ring that fits, enter it in mm or inches, and get the corresponding sizes in every major international system.

How to Measure Your Ring Size at Home

Find a Well-Fitting Ring: Use a ruler or caliper to measure the inner circumference in millimeters.
Wrap a Strip of Paper: Around your finger, mark the overlap, and measure the length to get the circumference.
Enter Measurement: Input the circumference or circumference into our tool to instantly see your size in US, EU, Asia, and more.

Expert Tips for Accurate Ring Sizing

Measure When Hands Are Warm: Cold fingers can be up to half a size smaller.
Account for Knuckle Size: If your knuckle is much larger than your finger base, size up slightly.
Try Multiple Times: Measuring a few times helps ensure accuracy.