Halo Rings

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Ring Size Conversion Guide

This ring size chart offers our closest size conversions. When in doubt, we recommend sizing up by 1/4 size for a more comfortable fit—or down for a snugger feel.

US/Canada	Inside Diameter (mm)	Inside Circumference (mm)
3	14.05mm	44.14mm
3 1/4	14.25mm	44.77mm
3 1/2	14.45mm	45.40mm
3 3/4	14.65mm	46.02mm
4	14.86mm	46.68mm
4 1/4	15.04mm	47.25mm
4 1/2	15.27mm	47.97mm
4 3/4	15.53mm	48.79mm
5	15.70mm	49.32mm
5 1/4	15.90mm	49.95mm
5 1/2	16.10mm	50.58mm
5 3/4	16.30mm	51.21mm
6	16.51mm	51.87mm
6 1/4	16.71mm	52.50mm
6 1/2	16.92mm	53.16mm
6 3/4	17.13mm	53.82mm
7	17.35mm	54.51mm
7 1/4	17.45mm	54.82mm
7 1/2	17.75mm	55.76mm
7 3/4	17.97mm	56.45mm
8	18.19mm	57.15mm
8 1/4	18.35mm	57.65mm
8 1/2	18.53mm	58.21mm
8 3/4	18.69mm	58.72mm
9	18.89mm	59.34mm
9 1/4	19.22mm	60.38mm
9 1/2	19.41mm	60.98mm
9 3/4	19.62mm	61.64mm
10	19.84mm	62.33mm
10 1/4	20.02mm	62.89mm
10 1/2	20.20mm	63.46mm
10 3/4	20.44mm	64.21mm
11	20.68mm	64.97mm
11 1/4	20.85mm	65.50mm
11 1/2	21.08mm	66.22mm
11 3/4	21.24mm	66.73mm
12	21.49mm	67.51mm
12 1/4	21.69mm	68.14mm
12 1/2	21.89mm	68.77mm
12 3/4	22.10mm	69.43mm
13	22.33mm	70.15mm