Fit and comfort matter when you choose a ring. Use the guide below to find your US ring size. Some of our rings are adjustable and fit sizes 5 to 9, so no sizing is needed for those; the product page will say if a ring is adjustable.

How to measure at home

1. Use a ring that already fits. Measure the inside diameter in millimeters with a ruler and match it in the chart below. This is the most accurate method.
2. Or measure your finger. Wrap a thin strip of paper or string around the base of the finger, mark where it overlaps, and measure the length in millimeters. That is your circumference.
3. Measure at the end of the day, when fingers are at their largest, and avoid measuring when your hands are cold.
4. Between two sizes? Choose the larger one. Wider bands fit more snugly than thin bands.

US ring size chart

US size	Inside diameter	Inside circumference
4	14.9 mm	46.8 mm
4.5	15.3 mm	48.0 mm
5	15.7 mm	49.3 mm
5.5	16.1 mm	50.6 mm
6	16.5 mm	51.9 mm
6.5	16.9 mm	53.1 mm
7	17.3 mm	54.4 mm
7.5	17.7 mm	55.7 mm
8	18.1 mm	57.0 mm
8.5	18.5 mm	58.3 mm
9	19.0 mm	59.5 mm
9.5	19.4 mm	60.8 mm
10	19.8 mm	62.1 mm
10.5	20.2 mm	63.4 mm
11	20.6 mm	64.6 mm
11.5	21.0 mm	65.9 mm
12	21.4 mm	67.2 mm
12.5	21.8 mm	68.5 mm
13	22.2 mm	69.7 mm

Still unsure? Email us at info@louisecarter-official.com with your finger measurement and we will tell you the size to order. Rings that do not fit can be exchanged within 30 days.