How to measure ring size

Circumference (mm)Diameter (mm)Size (India)Size (US)
44.1414.0543
45.1114.365
45.4014.456
46.6814.8674
47.9715.278
49.3215.7095
50.5816.1010
51.8716.51116
52.5016.7112
53.1616.9213
54.5117.35147
55.7617.5515
57.1518.19168
58.2118.5317
59.3418.89189
60.9819.4119
62.3319.842010
64.9720.6811