How to Find Your Ideal Ring Size

1. Use Your Current Ring Size

  1. Know your current ring size in either US, Canada, UK, Europe, Australia, China, Singapore, or Japan.
  2. Use the below chart to match your current ring size to the US ring size equivalent.
  3. Defendher rings sells its rings sized to US sizes.

US, Canada

UK, Australia, Ireland, New Zealand

China, Japan, Singapore, India, South America
4 H 7
4.5 I 8
5 J 1/2 9
5.5 K 1/2 10
6 L 1/2 11
6.5 M 1/2 13
7 N 1/2 14
7.5 O 1/2 15
8 P 1/2 16
8.5 Q 1/2 17
9 R 1/2 18
9.5 S 1/2 19
10 T 1/2 20
10.5 U 1/2 22
11 V 1/2 23
11.5 W 1/2 24
12 X 1/2 25


2. Measure an Existing Ring

  1. Select an existing ring that fits you perfectly.
  2. Measure the internal diameter of the ring in mm.
  3. Use the below chart to determine your ring size.

US Ring Size

Internal Diameter (mm)
4 14.88
4.5 15.29
5 15.7
5.5 16.1
6 16.51
6.5 16.92
7 17.32
7.5 17.73
8 18.14
8.5 18.54
9 18.95
9.5 19.35
10 19.76
10.5 20.17
11 20.57
11.5 20.98
12 21.39

 

3. Measure Your Finger

  1. Wrap a string or thin strip of paper around the base of your finger.
  2. Mark the spot on the string or paper where the string or paper meets.
  3. Measure the length of the string or paper in mm.
  4. Use the below chart to determine your ring size.

US Ring Size

Circumference (mm)
4 46.8
4.5 48
5 49.3
5.5 50.6
6 51.9
6.5 53.1
7 54.4
7.5 55.7
8 57
8.5 58.3
9 59.5
9.5 60.8
10 62.1
10.5 63.4
11 64.6
11.5 65.9
12 67.2

 

4. Professionally Measure Your Finger

Visit a local jewellery store or jeweller to have your finger professionally measured. Professionally measuring your finger is fast and most jewellery stores or jewellers will measure your finger for free.


Bonus

Can’t accurately measure your finger? Order the ring size you think will most closely fit your finger and try it on at home. We offer free exchanges until you get the perfect size ring!


Tips and Tricks

  1. Order half a size up if you’re between sizes. For example if you’re between a 7 and a 7.5, order a 7.5 from DefendHer Ring.
  2. Fingers expand when hot and shrink when cold. Measure your finger at the end of the day in a warm environment when your finger is at its largest size.
  3. The ring has to slide past the knuckle to reach its destination at the base of the finger. Therefore make sure the ring fits over your knuckle. If your knuckle is bigger than the base of your finger, pick a size between the two measurements.
  4. DefendHer rings are intended to be worn on the middle or index finger.
  5. DefendHer rings are designed to be worn snug around your finger. 
  6. DefendHer sells its rings in US sizes.