How to Measure Your Ring Size

Find your ring size at home in 2 minutes – no special tools needed. Our rings show the US size and the inside diameter in mm, so you can match either one.

Method 1 – with a ring you already wear

  1. Take a ring that fits the finger you want (it must fit comfortably).
  2. Put it on a ruler and measure the inside diameter – edge to edge on the inside, in millimetres.
  3. Find that number in the chart below. Example: 19.8 mm = US 10.

Method 2 – with a thread or a strip of paper

  1. Wrap a thread or a thin strip of paper once around the base of your finger.
  2. Mark the point where it meets. It should be snug but slide over the knuckle.
  3. Lay it flat on a ruler and measure the length in mm – this is the circumference.
  4. Find that number in the circumference column below. Example: 62 mm = US 10.

Ring size chart

US size Inside diameter Circumference
US 5 15.7 mm 49.3 mm
US 6 16.5 mm 51.9 mm
US 7 17.3 mm 54.4 mm
US 8 18.1 mm 57.0 mm
US 9 18.9 mm 59.5 mm
US 10 19.8 mm 62.1 mm
US 11 20.6 mm 64.6 mm
US 12 21.4 mm 67.2 mm
US 13 22.2 mm 69.7 mm

Ring size chart – US size, inside diameter and circumference in mm, how to measure

Tips for the right fit

  • Measure in the evening – fingers are slightly bigger later in the day.
  • Between two sizes? Choose the bigger one.
  • Wide rings (8 mm and more) feel tighter – go half a size up.
  • Measure 2–3 times to be sure.

Wrong size? No problem – message us on WhatsApp 0343 1788930 within 7 days and we will exchange it.

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