Women’s ring size chart
This chart covers US sizes 3 to 9, from 14.1 mm to 18.9 mm across inside, with the circumference and the nearest UK and ISO size. Ring sizes are one scale for everyone: this page shows the part of it jewellers list for women’s rings.
Women’s ring sizes
| US / Canada | Inside Ø mm | Circumference mm | UK | ISO |
|---|---|---|---|---|
| 3 | 14.1 | 44.2 | ≈ F½ | ≈ 44 |
| 3.5 | 14.5 | 45.5 | ≈ G½ | ≈ 45 |
| 4 | 14.9 | 46.8 | H½ | ≈ 47 |
| 4.5 | 15.3 | 48.0 | I½ | 48 |
| 5 | 15.7 | 49.3 | J½ | ≈ 49 |
| 5.5 | 16.1 | 50.6 | K½ | ≈ 51 |
| 6 | 16.5 | 51.9 | L½ | 52 |
| 6.5 | 16.9 | 53.1 | M½ | 53 |
| 7 | 17.3 | 54.4 | N½ | ≈ 54 |
| 7.5 | 17.7 | 55.7 | O½ | ≈ 56 |
| 8 | 18.1 | 57.0 | P½ | 57 |
| 8.5 | 18.5 | 58.2 | Q½ | ≈ 58 |
| 9 | 18.9 | 59.5 | R½ | ≈ 60 |
No standard says which sizes are for women. Blue Nile’s size guide, read November 10, 2026, lists women’s rings in sizes 3 through 9, which is the range this chart covers.
Choosing a women’s ring size
Measure the finger the ring will sit on, and do it more than once: a finger can be larger when warm and smaller when cold. A slim stacking band and one wide band do not feel the same at the same size.
The chart steps in half sizes, about 0.4 mm of inside diameter each. If you are between two, think about what will sit next to the ring: a ring worn beside others on one finger may need the larger size.
Questions
Do women’s rings use a separate scale?
No. The scale is the same for everyone: US 6 means 16.5 mm across inside on any ring. This chart stops at US 9 because the size guide we checked lists women’s rings up to 9.
Do stacked or wide rings need a different size?
They can feel tighter than one thin band. Pandora advises one size bigger when several rings are worn on one finger, and other jewellers may advise the same for wide bands.