Ring Size Guide

How to measure your ring size at home

Finding the right ring size is essential for comfort and security. At **Corollary Jewels**, we use the **US/Canada** standard sizing system. Please use this guide to accurately measure your size at home.

Method 1: Measure an Existing Ring (Most Accurate)

The best way to determine your size is to measure a ring you already own that fits the intended finger perfectly.

Steps for Method 1:

  1. **Select a Ring:** Choose a ring that fits the finger you plan to wear your new ring on. (Note: Fingers on your dominant hand are often a half size larger).
  2. **Measure the Inner Diameter:** Take a ruler (with millimeter measurements) and measure the **straight line distance across the inside center** of the ring. **Do not** include the metal of the ring in your measurement.
  3. **Match to Chart:** Use the **Ring Diameter** column in the chart below to find your correct **US Ring Size**.
Measure inner diameter of ring

Ring Size Chart (Diameter Method)

Use your measured inner diameter to find your US ring size.

Ring diameter to US size conversion chart

Method 2: Measure Your Finger Circumference (DIY)

If you don't have an existing ring, you can measure your finger directly.

Steps for Method 2:

  1. **Prepare a Strip:** Cut a thin strip of paper (about 1/4 inch wide) or use a piece of string.
  2. **Wrap and Mark:** Wrap the paper or string snugly around the base of the intended finger. Mark the point where the paper/string overlaps.
  3. **Measure the Length:** Lay the strip flat and use a ruler to measure the length in **millimeters (mm)** from the start to your mark. This is your **Circumference**.
  4. **Match to Chart:** Use the Circumference (MM) in the *comprehensive chart below* to find your correct US Ring Size.
Measure finger circumference with string or paper

**Crucial Tip:** Ensure the paper or string is wrapped *tightly enough* that it won't fall off but *loose enough* to slide comfortably over your knuckle.

Comprehensive Ring Size Conversion Chart (US Standard)

For the most detailed conversion, use your finger circumference here.

US / Canada Size (corollaryjewels) Inner Diameter (MM) Inner Circumference (MM) UK / Australia Size Europe (EU) Size
4 14.9 46.8 H 46 3/4
5 15.7 49.3 J 1/2 49 1/4
**6** **16.5** **51.9** **L 1/2** **51 3/4**
**7** **17.3** **54.5** **N 1/2** **54 1/2**
**8** **18.2** **57.0** **P 1/2** **57**
**9** **18.9** **59.5** **R 1/2** **59 1/2**
10 19.8 62.1 T 1/2 62
11 20.6 64.6 V 1/2 64 3/4
12 21.4 67.2 X 67 1/4

⭐ We offer sizes 6, 7, 8, and 9 as our core range, which covers most customers.

Expert Tips for the Best Fit

  • **Measure 3-4 Times:** Your finger size fluctuates throughout the day due to temperature and activity. Measure at the **end of the day** when your fingers are generally at their largest.
  • **Temperature Matters:** Avoid measuring when your hands are very cold (fingers are smaller) or very hot/swollen (fingers are larger).
  • **Knuckle Check:** If your knuckle is significantly larger than the base of your finger, measure both and choose a size **in between** to ensure it slides on easily but doesn't spin.
  • **Band Width:** For **wide band rings** (over 6mm), we recommend choosing a **half size up** from your regular size for the most comfortable fit.
  • **Between Sizes:** If your measurement falls between two sizes (e.g., between a 7 and an 8), **always choose the larger size** (the 8).

Still Unsure? A perfectly fitting ring is our goal! Contact our support team for personalized advice:

📧 support@corollaryjewels.com