Step 1: Take a piece of thread or a thin paper
Step 2: Measure the circumference of your finger using the thread/paper
Step 3: Measure the length of the thread using your ruler
Step 3: Use the below given table to find out your Ring size

RING SIZE	INTERNAL DIAMETER (CM)	INTERNAL CIRCUMFERENCE (CM)
5	14.3	44.8
6	14.7	46.1
7	15.1	47.4
8	15.3	48.0
9	15.5	48.7
10	15.9	50.0
11	16.3	51.2
12	16.5	51.9
13	16.9	53.1
14	17.3	54.4
15	17.5	55.1
16	17.9	56.3
17	18.1	57.0
18	18.5	58.3
19	18.8	58.9
20	19.2	60.2

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