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If you have a ring that already fits your finger well, you can find your US ring size by measuring the ring’s inside diameter.

Choose a ring that fits the finger you want to size.
Place the ring on a flat surface.
Measure the inner diameter of the ring in millimeters.
Match your measurement to the chart below.

If you’re between sizes, go up

Ring Size	Ring Diameter

5	0.61 in / 15.7 mm
6	0.64 in / 16.51 mm
7	0.68 in / 17.32 mm
8	0.71 in / 18.14 mm
9	0.74 in / 18.95 mm
10	0.77 in / 19.76 mm
11	0.81 in / 20.57 mm
12	0.84 in / 21.39 mm

Take a non-stretchy string or paper about 6" long and 1/4" wide. Wrap around the base of your finger. It has to fit snug, but not too tight.
Mark the point where the strip overlaps.
Lay it flat and measure from the start to the mark in millimeters.
Match your measurement to the chart below.

If you’re between sizes, go up

size	CIRCUMFERENCE

5	1.94 in / 49.32 mm
6	2.03 in / 51.87 mm
7	2.14 in / 54.41 mm
8	2.24 in / 56.99 mm
9	2.34 in / 59.53 mm
10	2.44 in / 62.08 mm
11	2.54 in / 64.62 mm
12	2.64 in / 67.20 mm

Length (IN)	Length (CM)
17.72	45
19.69	50
21.65	55
23.62	60
27.56	70