Ring Size Guide: How to Measure & International Conversion Chart

No way to measure right now? You can still order with confidence. Every No Name Craft Co. ring is made to order, so you can place your order and message us on the chat bubble — we will confirm your exact size with you before we begin crafting.

Three easy ways to find your size

  1. Measure a ring you already wear. Pick one that fits the intended finger, measure its inside diameter in millimeters, and match it to the chart below.
  2. Use string or paper. Wrap a thin strip of paper or string around the base of your finger, mark where it overlaps, lay it flat and measure the length in millimeters with any ruler. That length is your circumference — match it to the chart.
  3. Get measured, or print our sizer. Any local jeweler will size your finger free in a minute. Or use our printable ring sizer — print it at 100% / Actual size.

Quick reference — US sizes

US size Inside diameter Circumference (mm) Circumference (in)
4 14.9 mm 46.8 mm 1.84 in
5 15.7 mm 49.3 mm 1.94 in
6 16.5 mm 51.9 mm 2.04 in
7 17.3 mm 54.4 mm 2.14 in
8 18.1 mm 57.0 mm 2.24 in
9 19.0 mm 59.5 mm 2.34 in
10 19.8 mm 62.1 mm 2.44 in
11 20.6 mm 64.6 mm 2.54 in
12 21.4 mm 67.2 mm 2.65 in
13 22.2 mm 69.7 mm 2.74 in

For UK, EU sizes, see the full conversion chart below.

Full international conversion chart

No Name Craft Co. global ring size conversion chart: inside diameter in mm and inches, with USA, UK/Ireland/Australia, Germany/France, Spain/Italy and Japan/China/India equivalents

Ordering an in-between size

Need a half or quarter size — say a 7½? Order the next size up (an 8) at the same price, then tell us your exact size one of two ways: add it in the instruction box, or simply message us in chat with your order number. Either way we will craft it to your exact measurement and confirm before we begin.

How our rings fit

  • Ring size is measured at the midpoint of the band.
  • Wide bands sit snugger. For styles with a band 5 mm or wider, we automatically add a quarter size for comfort. If you usually wear thin bands and are ordering a wide style, consider sizing up.
  • Every ring has a smooth, comfort-fit interior for easy daily wear.

Still unsure?

Tap the chat bubble on any page. Made to order means we can craft any size or half-size — and we will always confirm with you before we start.