How to Determine Your Ring Size

How to Determine Your Ring Size

This guide provides methods for measuring your own ring size at home or for finding the size of a ring for someone else as a gift.

Measuring Your Own Ring Size

To determine your ring size, you can measure the circumference of your finger using a simple method:
  1. Wrap a thin strip of paper or a piece of string comfortably around the base of the identified finger.
  2. Mark the point where the material overlaps, forming a complete circle.
  3. Measure the length of the string or paper from the start to the mark using a ruler. This measurement is the circumference.
  4. Match this measurement to the circumference column in the conversion chart below to find your corresponding ring size.
For increased accuracy, you can use a dedicated measuring tool. You can find several options, including a printable ring sizer tool, from online retailers. Click here to order one.

Buying a Ring as a Gift

The most reliable way to find someone else’s ring size is to borrow one of their existing rings (ensuring it's worn on the correct finger) and measure its inside diameter.
  • Tip: For the best results, use a ring with a similar style and band width to the one you plan to purchase.

Ring Size Conversion Chart

Match your circumference or diameter measurement to the chart below to find the corresponding ring size in various international standards.

UK USA Circumference (in) Circumference (mm) Diameter (in) Diameter (mm)
L 5 1/2 1.99 50.5 0.645 16.40
M 6 2.04 51.8 0.661 16.80
N 6 1/2 2.09 53.1 0.677 17.20
O 7 2.15 54.4 0.685 17.40
P 7 1/2 2.20 55.7 0.708 18.00
Q 8 2.25 57.0 0.724 18.40
R 8 1/2 2.30 58.3 0.740 18.80
S 9 2.35 59.7 0.75 19.0
S 1/2 9.5 2.40 60.3 0.762 19.4
T 10 2.46 61.6 0.778 19.8
U 10.5 2.51 62.8 0.794 20.2
Keep in mind ring size can fluctuate based on many factors such as seasonal temperatures, weight loss and gain.

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