Request a Ring Sizer

Get the right size the first time by requesting a plastic ring sizer. To order, select your preferred delivery method:

  • Need it fast?
    FedEx Priority Overnight® or FedEx 2Day® starting at $15

  • Get it for FREE
    Standard 7-10 Day Delivery (8-15 Days in Canada). Request a FREE Ring Sizer
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Printable Ring Size Guide

Blue Nile realizes that you may not know the ring size for a given finger, and we want to help. We provide a printable ring sizer that can help you determine your ring size. Prior to printing, ensure that page scaling is set to "none" on your print dialog box.

View Ring Sizer

(These documents are PDF files PDF and require Adobe Acrobat Reader. If you do not have Acrobat Reader download it for free.)



Measuring Your Finger

Your ring should fit your finger comfortably; snug enough so that it will not fall off, but loose enough to slide over your knuckle.

Finger size changes depending on the time of day and the weather. For best results measure your finger size:

  1. At the end of the day and when your fingers are warm (Fingers are smaller in the early morning and when cold.)
  2. Measure finger size 3 to 4 times to eliminate an erroneous reading.

Avoid using string or paper to measure ring size as these materials can stretch or twist, yielding an inaccurate measurement.

Ring Sizes in the US

Women’s rings typically range from size 3 to 9. The most commonly purchased women’s ring sizes at Blue Nile range from size 5 to 7. Size 6 is the most popular ring size.

Men’s rings typically range from size 8 to 14. The most commonly purchased men’s ring sizes at Blue Nile range from size 8 to 10-½. Size 9 is the most popular ring size.

Tips for Buying the Ring as a Surprise

Ask your significant other’s friends or mother if they know her finger size.

Borrow his/her ring (from the correct finger) and use the ring measurements above to determine its size.

Find Your Perfect Ring

Engagement Ring Guide
Get the expert guidance on finding the perfect engagement ring.
Wedding Ring Guide
This guide details all you'll need to know about choosing women's and men's wedding rings.
 
 

Free Resizing

Blue Nile provides complimentary resizing for Build Your Own Rings®, and Diamond Bands when within the manufacturer's recommended sizing range, during the first year. Simply contact a Diamond & Jewelry Consultant at 800-242-2728 to arrange for your free resize. You will be responsible for the cost of returning the product, according to our return policy.

Diamond and gemstone eternity rings with a specific number of gemstones per finger size; milgrain or ornate bands, some silver rings, or rings with alternative metals such as Tungsten cannot be resized. We are happy to exchange your ring for another 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.

International Size Conversion

If ordering from outside of the US or Canada, determine your ring size according to your country’s standard. Then use the International Ring Size Chart to convert to the corresponding US ring size to place your order.

International Ring Size Chart

Circumference
(mm)
Diameter
(mm)
UK, Europe,
& Australia
United States
& Canada
ChinaSG/JPHKSwitzerland
44.2 14.1 3 6 4 6 4
44.8 14.3 G     5  
45.5 14.5 7   7.5  
46.1 14.7 H     6  
46.8 14.9 4 8 7 9  
47.4 15.1 I   9    
48.0 15.3   8 10  
48.7 15.5 J         9
49.3 15.7 5 10 9 11  
50.0 15.9 K         10
50.6 16.1 11 10 12  
51.2 16.3 L         11¾
51.9 16.5 6 12 11 13 12¾
52.5 16.7 M   13 12    
53.1 16.9   13 14.5 14
53.8 17.1 N   14      
54.4 17.3 7   14 16 15¼
55.1 17.5 O   15      
55.7 17.7   15 17 16½
56.3 17.9 P   16      
57.0 18.1 8 17 16   17¾
57.2 18.2         18  
57.6 18.3 Q          
58.3 18.5 18 17 19  
58.9 18.8 R         19
59.5 19.0 9 19 18 20.5  
60.2 19.2 S   20     20¼
60.8 19.4   19 22  
61.4 19.6 T   21     21½
62.1 19.8 10   20 23  
62.7 20.0 U   22 21    
63.4 20.2 10½   22 24 22¾
64.0 20.4 V   23      
64.6 20.6 11   23 25  
65.3 20.8 W   24     25
65.9 21.0 11½ 25 24 26  
66.6 21.2 X          
67.2 21.4 12 26 25 27.75 27½
67.8 21.6 Y          
68.5 21.8 Z 12½   26   28¾
69.1 22.0          
69.7 22.2   13   27 30  
70.4 22.4 Z+1          
71.0 22.6 Z+2 13½