Ring Size Guide: How to Measure Your Ring Size

To make determining ring size easier our diamond jewellery experts have put together this complete ring size guide with tools and tips to find your ring size using our free ring sizer tool, printable ring size chart and at-home measuring tips. Whether you're just curious about your ring size or you're shopping for engagement rings or wedding rings, we take the guesswork out of finding the perfect fit when shopping for rings online. It’s just one reason why we've helped over 500,000 couples find their perfect ring.

Ring Size Chart and Sizing Tools

For the most accurate fit, we recommend our free plastic ring sizer, or try out our printable PDF Ring Size Guide with ring sizing tips and international ring size conversion chart.

Get Our Ring Sizer Tool

Ring Sizer Tool

Get a free plastic ring sizer mailed to you.

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View Our Ring Size Guide

Ring Size Guide

Check out our printable PDF ring sizer and size conversion chart.

Print Ring Sizer

How to Use Our Printable Ring Sizer

Borrow a ring the recipient wears frequently (on his or her right ring finger), download our printable ring sizer and move the ring from size to size until you land on the one that matches. This .PDF file includes an international ring-sizing chart.

How to Use Our Ring Sizer Tool

Ring sizing on your own is an imperfect science, but you can improve your chances by ordering our plastic ring sizer. If using the ring-sizer for yourself, try wearing the sizer for a short while at different times of the day as your finger size can fluctuate between morning and evening. For help getting someone else’s ring size, ask a family member or friend to use the plastic rings while sizing their finger in front of your significant other, to compare sizes. Then they can pass the information along secretly to you. Get our ring sizer tool for free in 7 to 10 days.

U.S. and International Ring Sizes: Conversion Chart

If ordering from outside of the U.S. or Canada, determine your correct ring size according to your country's standard. Our International Ring Size Conversion Chart provides ring sizes for Europe, the UK, Australia, Singapore, Japan, Hong Kong and Switzerland, and will help you convert your ring size to U.S. measurements.

Other Ways to Find Ring Size

Luckily, there are many ways to determine ring size. If you're shopping for someone else, the best way to learn his or her ring size is to simply ask. But that obviously doesn’t work if you're planning a surprise. Consider enlisting friends and family in your quest for the right ring size – they can ask without raising any eyebrows.

If you can't keep it a secret, or are shopping for yourself and you don't know your ring size, there are a number of at-home methods to find your ring and finger size. We recommend the methods and tips listed below when trying to determine ring size

Use String or Paper to Find Your Ring Size

  1. Use string or paper only to get a general idea of your ring size.
  2. Wrap the material around the base of your finger.
  3. Use a pen or pencil to mark the point on the string or paper where the ends meet.
  4. Measure the string or piece of paper with a ruler.
  5. Use the chart below to find your approximate ring size based on your measurement.
  6. Keep in mind that string, floss, and paper can stretch and twist, making for a less-than-accurate measurement.

Use Another Ring to Measure Your Ring Size

  1. Select a ring that properly fits your finger.
  2. Use a ruler to measure the diameter of the inside circle of the ring.
  3. Use our printable ring sizer to find your ring size based on your measurement.
  4. Choose the larger size if the ring falls between two sizes.

Take a Guess Using Common Ring Sizes

On average, women’s ring sizes range from size 3 to size 9, and the most commonly purchased sizes range from 5 to 7; size 6 is the most popular. The average ring size for men ranges from size 8 to size 14. The most commonly purchased men’s rings range between 8 to 10-½; size 9 is the most popular. These standard ring sizes can help guide you in the right direction. Gauge your partner’s finger shape. If they’re more slender than average, size down and vice versa.

More Ring Sizing Tips

  1. The ring should fit your ring finger comfortably: snug enough so it won’t fall off, but loose enough to slide over your knuckle with relative ease.
  2. When the knuckle is bigger than the base of the finger, measure both places and pick a size in between the two.
  3. Measure your ring size at the end of the day when your fingers are warm. Finger size changes depending on the time of day and the weather, and your fingers are actually smaller in the early morning and in cold weather. Also, keep in mind that fingers on your dominant hand are usually larger.
  4. Measure finger size 3 to 4 times to eliminate an inaccurate reading.

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What Happens When My Ring Is Resized?

To make sure you get the best possible fit, the ring resizing process requires adding or removing small amounts of metal depending on the difference between the size purchased and the new size requested. As a result, your ring may be slightly thicker or thinner after resizing. These tiny changes are often visually imperceptible.

The expert jewellery makers at Blue Nile adhere to strict quality standards so your resized ring both sparkles, and fits, beautifully. After the band is resized, each ring gets cleaned and polished before being returned to you.

What If I Order the Wrong Ring Size?

Don't let the question of size stress you out. Blue Nile provides complimentary resizing for most engagement rings and wedding bands within the manufacturer's recommended sizing range, during the first year. If you need a different ring, we offer a 30-day exchange policy for your convenience.

Rings That Can't Be Resized

Some of our ring styles cannot be resized due to their design. In these cases, an cannot be resized icon will appear on the product detail page under the ring size selection.

For example, diamond and gemstone eternity rings with a specific number of gemstones per finger size, milgrain or ornate bands, silver rings, or rings with alternative metals such as Tungsten cannot be resized.

We are happy to exchange your ring for another ring in the correct size within 30 days of purchase. It is important to note that should you opt for an exchange, your new ring may contain fewer or more gemstones, diamonds, or a reduction or increase in precious metal weight, which may cause an increase or decrease in the price.

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