Ring Sizing Guide

When determining your ring size, keep in mind that your finger size can expand and shrink due to temperature changes, eating certain foods, or doing certain activities with your hands. When it comes to temperature change, your fingers are typically bigger in the morning or when you're hot. On the other hand, your fingers shrink when you are cold. So be sure to measure your ring size in a few situations to help you pick your size.

Example: My index finger is usually a US 6. But when it's cold, my index finger can drop to a US 5. And when it's hot or my fingers are swollen my index finger can go up to a US 7.

Method #1: Measure the diameter of an existing ring 

  1. Pick an existing ring that fits the desired finger.
  2. Measure the internal diameter of the existing ring in millimeters. 
  3. Match the measurement to the closest number on the below chart to find your approximate ring size.
US Ring Size Ring Internal Diameter (mm)
4 14.9
5 15.7
6 16.5
7 17.3
8 18.1
9 19
10 19.8
11 20.6
12 21.4

 

Method #2: Measure the circumference of your own finger 

  1. Wrap a length of (non-stretchy) string/ribbon/paper around the desired finger. Make sure to pull it so it's a snug fit.
  2. Measure the length of the string/ribbon/paper in millimeters.
  3. Match the measurement to the closest number on the below chart to find your approximate ring size.
US Ring Size Finger Circumference (mm)
4 46.8
5 49.3
6 51.9
7 54.4
8 57
9 59.5
10 62.1
11 64.6
12 67.2

 

Adjustable EDS Ring Splint Size Equivalents

To choose the correct size for your EDS ring splint, use a standard ring sizer (or use Method #2 above) and measure around your knuckle. The fit should be snug but not tight.

If you already have EDS rings, use the chart below as a guide to find the approximate EDS ring splint size. 

Adjustable Ring Splint Size EDS Ring Splint Size Equivalent
4 5.5-6.5
5 6.5-7.5
6 7.5-8.5
7 8.5-9.5
8 9.5-10.5
9 11-12
10 12-13
11 13-14
12 14-15