EU to US Ring Size Converter: European to American Sizing Chart
Ordering a ring from a European jeweler but confused by the sizing? European ring sizes are fundamentally different from US sizes. While US ring sizes use simple numbers like 6, 7, or 8, European sizes are based on inner circumference measured in millimeters. This means an EU 52 ring has an inner circumference of exactly 52mm—a much more precise system.
Whether you're shopping on international jewelry websites, buying rings while traveling in Europe, or ordering custom pieces from German, Italian, or French jewelers, understanding EU to US ring size conversion is essential. Without proper conversion, you risk receiving a ring that doesn't fit, leading to costly returns and delays.
This comprehensive EU to US ring size converter includes a complete sizing chart, real-world examples, and verification methods to ensure you order the correct size every time. Our tool covers the full range from EU 44 (US 3) through EU 70 (US 13), with internal diameter measurements for additional accuracy.
Understanding European Ring Sizing
The European ring sizing system is used throughout continental Europe, including Germany, France, Italy, Spain, Scandinavia, and most other European countries. This system is elegantly simple: the ring size number equals the inner circumference in millimeters.
For example, an EU 52 ring has an inner circumference of exactly 52mm. An EU 60 ring measures 60mm around the inside. This metric-based approach makes European sizing universally consistent—a German jeweler and an Italian jeweler will always mean the same thing when they say "EU 52."
European ring sizes increment by half-size intervals in most cases (EU 44, 45.5, 47, 48, 49.5, etc.), providing finer granularity than the US system. Some countries apply slight rounding variations, and certain luxury Italian brands may use proprietary sizing scales, which is why direct diameter measurement remains the gold standard for verification.
The metric precision of the European system makes it particularly reliable for online shopping. When a European jeweler lists a ring as EU 52, you can trust that measurement applies consistently worldwide, making conversion to US sizing a straightforward mathematical process based on the internal diameter equivalent.
EU to US Ring Size Conversion Chart
Use the chart below to convert European ring sizes to US sizes. Each row includes the European size, equivalent US size, and the internal diameter in millimeters for additional verification. Find your European size in the left column, then read across to find your US equivalent.
| European Size | US Size | Inside Diameter (mm) |
|---|---|---|
| EU 44 | US 3 | 14.0 |
| EU 45.5 | US 3.5 | 14.4 |
| EU 47 | US 4 | 14.8 |
| EU 48 | US 4.5 | 15.2 |
| EU 49.5 | US 5 | 15.7 |
| EU 50.5 | US 5.5 | 16.1 |
| EU 52 | US 6 | 16.5 |
| EU 53 | US 6.5 | 16.9 |
| EU 54.5 | US 7 | 17.3 |
| EU 55.5 | US 7.5 | 17.7 |
| EU 57 | US 8 | 18.1 |
| EU 58 | US 8.5 | 18.5 |
| EU 59.5 | US 9 | 19.0 |
| EU 61 | US 9.5 | 19.4 |
| EU 62 | US 10 | 19.8 |
| EU 63.5 | US 10.5 | 20.2 |
| EU 65 | US 11 | 20.6 |
| EU 66 | US 11.5 | 21.0 |
| EU 67.5 | US 12 | 21.4 |
| EU 69 | US 12.5 | 21.8 |
| EU 70 | US 13 | 22.2 |
Why EU Sizes Cause Confusion for American Buyers
Understanding why European sizing causes confusion helps you navigate international ring shopping more confidently. Here are real-world scenarios where EU sizing creates challenges:
Ordering from a German Etsy Jeweler
You find a beautiful handcrafted ring on Etsy from a Berlin jeweler. The listing shows "available sizes: EU 48, EU 50, EU 52, EU 54." Without conversion knowledge, you might assume these are arbitrary labels. In reality, that EU 52 ring has a precisely measured 52mm inner circumference—equivalent to US 6—a size that would be far too large if you normally wear a US 3 or 4.
Italian Jewelry Sizing Variations
Italian jewelry brands are particularly tricky because some luxury manufacturers use their own proprietary sizing scales rather than standard EU sizes. A ring marked "size 11" from one Italian brand might not match EU 59 from another. This is why Italian jewelers often provide diameter measurements alongside size numbers—they acknowledge that their scales may vary.
French Jewelry Labeling Differences
French jewelers typically use EU sizing, but older French jewelry or vintage pieces sometimes use different scales. A ring stamped "size 17" might refer to an older French system rather than EU 52. When purchasing antique or vintage French jewelry online, always ask the seller for internal diameter measurements rather than relying solely on the marked size.
Three Ways to Double-Check Your Converted Size
Converting EU to US sizes is straightforward when using our chart, but verification adds an extra layer of confidence when making expensive purchases. Use one or more of these methods to confirm your conversion:
Method 1: Measure Inside Diameter with Ruler or Caliper
If you own a ring that fits well, this is the most reliable verification method. Using a ruler or digital caliper, measure the inside diameter of your well-fitting ring. Compare this measurement to the "Inside Diameter (mm)" column in our conversion chart above.
For example, if your well-fitting ring measures 16.5mm inside diameter, you can see from the chart that this corresponds to EU 52 and US 6. When ordering from European jewelers, request EU 52. This direct measurement bypasses all conversion complexity.
Method 2: Use the Ring Sizer App on Your Phone
The Ring Sizer app provides an instant, visual way to determine your exact ring size using your smartphone. Simply place your well-fitting ring on your phone screen and adjust the digital sizer to match the ring's inside edge. The app instantly converts to all international sizing systems, including EU, US, UK, and displays the internal diameter.
This app eliminates guesswork and is especially useful when you're shopping while traveling in Europe. Download it from the App Store for iOS devices.
Method 3: Ask the Seller for Inside Diameter in Millimeters
The most universal verification method is simply asking the seller or jeweler for the internal diameter measurement in millimeters. This is a standard piece of information that all reputable jewelers can provide, regardless of their location or sizing system.
When you receive the diameter (e.g., "16.5mm"), cross-reference it with our chart. This approach works for German, Italian, French, Scandinavian, and all other European jewelers. It also future-proofs your purchase—if you ever need to resize or reference the ring, the diameter measurement remains universally understood.
Size Up or Size Down? Decision Rules
Even with an accurate conversion, several factors influence whether to order up or down when given a choice. Use these decision rules to make the right call:
Between Two EU Sizes → Size Up for Comfort
If your measurement or calculated size falls between two EU sizes (e.g., your ring measures 16.7mm, falling between EU 52 and EU 53), order the larger size. A ring that's slightly loose can be resized down more easily and affordably than one that's too tight. In this case, choose EU 53 (US 6.5) rather than EU 52 (US 6).
Wide Bands (>6mm Width) → Add 1 EU Size
Wide rings feel tighter on the finger than narrow rings of the same diameter. If you're ordering a wide band (anything over 6mm wide), add one full EU size (approximately 1 US size). A wide EU 54 ring will feel similarly snug to a narrow EU 53 ring. This adjustment accounts for the different contact pressure on your finger.
Dominant Hand Is Usually 0.5 Size Larger
Most people's dominant hand (right hand for right-handed people, left for left-handed) is slightly larger than their non-dominant hand. If you're buying rings for both hands, order your dominant hand 0.5 EU sizes larger. This usually means ordering EU 52.5 or EU 53 for your dominant hand if you'd normally wear EU 52.
Temperature Affects Finger Size
Fingers swell in warm weather and contract in cold weather—a physiological response to blood circulation changes. If you're measuring your ring size on a hot summer day, your finger is at its largest. If you measure on a cold winter day, your finger is at its smallest. Measure your ring size at a moderate room temperature whenever possible, or if you know you'll primarily wear the ring in warm seasons, size up slightly to account for summer swelling.
Frequently Asked Questions
Is Italian ring size the same as EU size?
Italian ring sizing is mostly aligned with EU sizing, as Italy is part of Europe and most modern Italian jewelers use the EU system (where size = inner circumference in mm). However, some luxury Italian brands and vintage Italian jewelry use proprietary scales that don't match standard EU numbers. If you're unsure, always ask the Italian jeweler for the internal diameter in millimeters—this universal measurement clarifies any sizing discrepancies and ensures accurate conversion.
What is EU 52 in US size?
EU 52 converts to US 6. An EU 52 ring has an inner circumference of 52 millimeters, which corresponds to an inside diameter of 16.5mm and US size 6. This is one of the most common conversions for average adult ring sizes. If you normally wear a US 6, you would order EU 52 from European jewelers.
How do I convert my EU ring size if I'm between sizes?
If your measured diameter falls between two EU sizes on the chart, use the internal diameter in millimeters as the universal bridge. For example, if your ring measures 17.5mm inside diameter, it falls between EU 54.5 (17.3mm) and EU 55.5 (17.7mm). In this case, order EU 55.5 to be slightly loose rather than slightly tight. Alternatively, ask the European jeweler for their smallest available size above your measurement and request a size that can accommodate future adjustments.
Can I resize a ring ordered from Europe?
Yes, European-made rings can be resized by most jewelers worldwide. However, sizing costs and feasibility depend on the ring's material and construction. Gold and silver rings are typically resizable, while some fashion rings with special coatings or stone settings may be impossible to resize. Before ordering an expensive European ring, ask the seller about resizing policies and estimated costs. It's usually more economical to order the correct size initially than to pay for resizing afterward.
What's the formula to convert EU to US ring size?
The mathematical relationship between EU and US sizes uses the internal diameter as the bridge. EU sizes represent circumference in millimeters; convert to diameter using the formula: Diameter (mm) = Circumference (mm) ÷ 3.14159. Then match this diameter to the US size chart. However, this is unnecessarily complex—our conversion chart above already performs these calculations, so you can look up your EU size directly without any math.
Is the EU ring sizing system used in the UK?
No. The United Kingdom uses its own separate sizing system (UK sizes like H, I, J, K, etc.). Even though the UK is geographically close to continental Europe, British ring sizing is entirely different from EU sizing. If you're ordering from a UK jeweler, use our US to UK ring size converter instead. For complete cross-reference information, see our guide on US vs EU ring sizes.
Related Ring Sizing Tools
Expand your sizing knowledge with these related conversion tools and guides:
US to UK Ring Size Converter
Convert between US numeric sizes and UK letter sizes for British jewelry shopping.
Letter to Number Ring Size Converter
Understand how letter-based sizes translate to numeric US sizes.
Complete Ring Size Chart
View all international sizing systems in one comprehensive chart.
Complete Ring Sizing Guide
Master everything about ring sizing, measurement, and fitting.
US Ring Size Guide
Detailed information about American ring sizing standards.
UK Ring Size Guide
Complete guide to British letter-based ring sizing system.
European Sizing by Country
Most European countries use the standard EU sizing system. Here are resources for shopping from specific European jewelers:
Get Your Exact Ring Size Instantly
Download the Ring Sizer app to measure your ring size using your smartphone. Covers all international sizing systems including EU, US, UK, and displays internal diameter for universal verification.
