International Ring Size Chart

Ring-size labels vary by country. Use this chart to compare common US/Canada, UK/Australia, and European sizes. When possible, use the measured inside diameter or circumference as the most reliable reference.

US / Canada UK / Australia EU Inside Diameter (mm) Inside Circumference (mm)
3 F 44 14.1 44.3
3.5 G 45 14.5 45.6
4 H 46.5 14.9 46.8
4.5 I 47.5 15.3 48.1
5 J 49 15.7 49.3
5.5 K 50 16.1 50.6
6 L 51.5 16.5 51.8
6.5 M 52.5 16.9 53.1
7 N 54 17.3 54.4
7.5 O 55.5 17.7 55.6
8 P 57 18.1 56.9
8.5 Q 58 18.5 58.1
9 R 59 19.0 59.7
9.5 S 60.5 19.4 60.9
10 T 62 19.8 62.2
10.5 U 63 20.2 63.5
11 V 64 20.6 64.7
11.5 W 65.5 21.0 66.0
12 X 66.5 21.4 67.2
12.5 Y 68 21.8 68.5
13 Z 69 22.2 69.7

Conversions are approximate because sizing conventions can vary slightly by country and manufacturer. If you know the inside diameter or circumference of a ring that fits well, use that measurement as your primary reference.

Not sure of your measurement?

Use the Lunéa Paris on-screen ring sizer or the Printable Ring Sizer for another way to check your size.

Diamond ring on water with a dark blue background

Lunéa Paris

Who We Are

Lunéa Paris was created with one goal: make modern luxury feel personal. Pieces that look unforgettable, feel comfortable, and carry meaning—whether it’s a gift, a milestone, or a promise.

We choose lab-grown diamonds for their brilliance and our belief in a better way forward. Each design is crafted with intention and finished with precision—so your jewelry feels just as special years from now.

  • Brilliance you can feel
  • Made with love
  • Design-first craftsmanship
  • Responsible by choice
  • Made for everyday elegance