Ring Size Guide

Find your perfect fit in three easy steps. A well-fitted ring sits comfortably — snug enough not to slide off, loose enough to slide over the knuckle with slight resistance.

How to Measure Your Ring Size

Choose either method below. The string/paper method works best if you don't have an existing ring to reference.

Method 1 — String or Paper Strip

Mark where string meets — measure length 1 0mm50mm100mm Measure this length (mm) 2 Lay the strip flat on a ruler
  1. Cut a thin strip of paper or use a piece of string.
  2. Wrap it snugly around the base of your finger — not too tight.
  3. Mark where the end meets the strip, then lay it flat against a ruler.
  4. Note the length in millimetres — this is your circumference.
  5. Find your size in the chart below using the circumference column.

Method 2 — Existing Ring

⌀ diameter Measure inner diameter in mm Use inside edge to inside edge
  1. Take a ring that fits the intended finger well.
  2. Place it flat on a ruler or measuring tape.
  3. Measure the inner diameter — inside edge to inside edge.
  4. Note the measurement in millimetres.
  5. Match it to the diameter column in the chart below.

Ring Size Chart

US ring sizes with corresponding circumference and inner diameter measurements.

US Size Circumference Inner Diameter
3 44.2 mm 14.1 mm
3.5 45.5 mm 14.5 mm
4 46.8 mm 14.9 mm
4.5 48.0 mm 15.3 mm
5 49.3 mm 15.7 mm
5.5 50.6 mm 16.1 mm
6 51.9 mm 16.5 mm
6.5 53.1 mm 16.9 mm
7 54.4 mm 17.3 mm
7.5 55.7 mm 17.7 mm
8 57.0 mm 18.1 mm
8.5 58.3 mm 18.6 mm
9 59.5 mm 18.9 mm
9.5 60.8 mm 19.4 mm
10 62.1 mm 19.8 mm
10.5 63.4 mm 20.2 mm
11 64.6 mm 20.6 mm
11.5 65.9 mm 21.0 mm
12 67.2 mm 21.4 mm
13 69.7 mm 22.2 mm

Tips for an Accurate Fit

  • Measure at end of day — fingers are slightly larger in the evening and after activity.
  • Avoid cold conditions — fingers shrink when cold, which can lead to ordering too small.
  • Measure the correct finger — right and left hand fingers may differ slightly in size.
  • Wide bands fit tighter — if ordering a band wider than 6mm, consider sizing up half a size.
  • Measure 2–3 times for consistency before deciding on a size.
  • Between sizes? — choose the larger size for comfort.

Still unsure about your size? Contact us — we're happy to help you find the perfect fit.