How to Convert European Ring Size to US

Online shopping has become the new norm, making it easier than ever to purchase products from around the globe, including rings. However, one of the biggest challenges for international shoppers is ensuring they get the correct ring size, especially when sizing standards differ between countries.

Europe and the US, for instance, use distinct ring size systems that can be confusing if you're unfamiliar with them. So, it is crucial to understand how ring sizes vary across regions and how to seamlessly make international ring size conversions to save you from costly resizing or returns.

In this guide, we'll walk you through how to convert European ring size to US size, ensuring that the next time you shop across borders, you can confidently shop online and find the perfect fit.

 The History Behind Ring Sizing Systems

Ring sizing systems have evolved differently across the globe, with each region developing its method based on cultural preferences and historical practices.

European Ring Sizing System

In Europe, ring sizing began with medieval goldsmiths, who relied on the inner diameter of rings to ensure precise craftsmanship for women's and men's rings. This method, also called the ISO size system, emphasized accuracy and was later standardized to use millimeters, forming the foundation of the European ring sizing system we know today. 

The European sizing system, widely used in countries like Norway, France, Denmark, Austria, and others, allows for a more detailed and customized fit. However, it's worth noting that not all European countries follow the same system. For example, some European countries, like Germany, have German sizes, the UK uses an alphabetical sizing system, and Switzerland uses the Swiss sizing system, which adds another layer of complexity for international customers shopping for rings across Europe.

 US Ring Sizing System

In contrast, the US Ring sizing system uses a more simplified approach, adopting a numerical scale that ranges from 1 to 16, with half and quarter sizes. This metric system accommodates a broad spectrum of finger sizes, with the average ring size for women ranging from 3--9 and 6--13 for men. These sizes are determined by measuring the inner diameter of a ring or the circumference of your finger in inches using a measuring tape and comparing the measurements to a size chart.

Ring Size Conversion Chart

US Size Inner Diameter (mm) European Size

4 14.9 49

4.5 15.3 50

5 15.7 51

5.5 16.1 52

6 16.5 53

6.5 16.9 54

7 17.3 55

7.5 17.7 56

8 18.1 57

8.5 18.5 58

9 18.9 59

9.5 19.3 60

10 19.7 61

10.5 20.1 62

11 20.6 63

11.5 21.0 64

12 21.4 65

12.5 21.8 66

13 22.2 67

13.5 22.6 68

14 23.0 69

14.5 23.4 70

15 23.8 71

15.5 24.2 72

16 24.6 73

The Conversion Process

Converting ring sizes requires more than simply matching numbers on a chart. To ensure the perfect fit, it's essential to understand how ring size is measured and the different factors that can influence your final size. Here's a guide to help you convert your ring size measurements accurately.

 1. Gather the Necessary Information

The first step is to ensure that you have accurate measurements of your ring size. This can be done by using a printable ring sizer or a flexible measuring tape to measure the circumference of your finger and comparing the measurement to an accurate ring size chart or printable ring size chart for accurate measurements.

It's also important to consult a credible wedding band style guide to understand how the different band styles influence ring sizes to make a better-informed decision. Remember, accuracy in this step is key, as even a millimeter off can make a big difference.

 2. Convert Diameter and Circumference Measurements

To convert between European and US sizes or other international ring sizes, you can use the internal diameter or internal circumference of your ring, measured in millimeters, and match it to its equivalent on the conversion table.

Once you have your correct measurement, find your corresponding US size using a reliable ring size chart like the one above as a reference. For instance, if the inner diameter of your ring/circumference of your finger measures 17.3 mm, using the conversion chart, you'll find that it corresponds to an EU size 55, which corresponds to a US size 7.

 3. Consider Size Tolerances

Slight variations in sizing can occur between different jewelers or brands due to differences in manufacturing standards. A size 7 from one brand might feel slightly different than a size 7 from another. To ensure the best fit, always check the specific size chart provided by the retailer or manufacturer, as their measurements might differ slightly from standard conversions, following their sizing guidelines.

Common Pitfalls and Tips

Even with all the right conversion information at hand, it's still possible to end up with an ill-fitting ring. This usually happens when other critical factors are overlooked, such as the width of the ring, fluctuations in finger size, or variations in materials.

To help avoid these issues, here are some common pitfalls and helpful tips to help you avoid them and get the best fit possible.

Not Considering Width and Material

The width of the ring band can significantly affect its fit and size, even if the ring's inner diameter remains the same. Wider bands tend to occupy more space on the finger, making them feel bulkier and potentially tighter than narrower bands. If your ring of choice has a thicker band, you may need to size up slightly for a comfortable fit.

The material of the ring can also influence its fit and size. Metal rings like gold, silver, platinum, or tungsten rings tend to be more rigid and less flexible than silicone rings. This means they require a slightly larger size to accommodate finger swelling or changes due to temperature, unlike silicone rings that conform to the shape or size of the finger more easily.

Relying Solely on Conversion Charts

While conversion charts are useful, they aren't foolproof. Variations between jewelers, ring styles, and even finger shapes can impact sizing. If you're uncertain, it's best to visit a jeweler to get your correct size, especially for rings meant to last a lifetime, like women's or men's wedding bands.

Seasonal and Daily Finger Size Fluctuations

Fingers can swell or shrink throughout the day due to changes in temperature, humidity, or physical activity. In hot weather, fingers tend to swell, while they may shrink in cold weather. To get the most accurate ring size, it's best to measure your finger at the end of the day when it's at its largest and avoid measuring when your hands are cold or right after physical exertion.

Considering Knuckle Size

If you have larger knuckles, it's essential to account for this when selecting a ring size. You'll want a ring that can comfortably pass over your knuckle but doesn't feel too loose once it's on. Balancing the fit over the knuckle and around the finger is key to ensuring comfort and security.

Adjusting for an Incorrect Size

If you have a ring that doesn't fit correctly, you need not worry…too much. Most metal rings can easily be resized, and there are a number of solutions available to ensure a comfortable fit.

Ring adjusters offer a temporary, non-invasive solution for minor size adjustments. These small, flexible inserts can make a loose ring fit more snugly. If it's too tight, temporary fixes like lubricants can help you slide it on or off easily.

For a permanent solution, professional resizing services are the best option. Jewelry experts can either resize the band by adding or removing material, depending on whether you need a larger or smaller fit. This option is ideal for rings made from materials like gold, platinum, or silver. With more complex designs, like rings with gemstones, special care is required during the process.

Ready to Wear Your Ring with Confidence?

Converting European ring size to US isn't just about the numbers—it involves taking factors like the width of the band, material, and daily size fluctuations into account. Whether you're measuring for the first time or adjusting for an incorrect fit, being mindful of these details can make all the difference.

If you're looking for the perfect wedding ring or looking to upgrade your EDC with a ring that fits perfectly, Ridge offers high-quality, stylish options designed for everyday wear. Check out our Ridge Rings collection today and find your perfect ring.

FAQs

How should I wear rings as a man?

You can wear rings on any finger, but typically men wear them on the ring finger of their left hand for groom rings or on the pinky or middle finger for style.

What is a size 7 ring in Europe?

A US size 7 ring is equivalent to a European size 55.

 What is a 6.5 US ring in the EU?

A US size 6.5 ring converts to a European size 54.

What is a size 50 EU ring in the US?

A European size 50 ring is equivalent to a US size 5.

 How do I know my EU ring size?

To know your EU ring size, measure the circumference of your finger in millimeters and match the measurement to the corresponding ring size on an EU size chart.

Why does my converted ring size feel different from my usual size?

Differences in band width, material, or small sizing variations between manufacturers can make your converted size feel slightly different. Temperature and finger swelling may also affect the fit of the ring.

Can I use my UK ring size to determine my EU size?

Yes, you can use a conversion chart to match your UK ring size with the corresponding EU size, as both follow different sizing systems.