In a rush? Here's a rough guide - for the average woman in US sizes:

Convert your ring size to the corresponding USA ring size by clicking here.

OR: Follow the directions below to measure your finger and work out your USA ring size:

1. Find a piece of string or strip of paper no wider than 3/4".
2. Wrap it around the base of the appropriate finger.
3. Use a pen to mark the point on the string/paper where it overlaps, forming a complete circle.
4. With a ruler, measure the length from the starting end of the string/paper to the pen mark.
5. Use this measurement and the chart to the below to determine your ring size.

Ring Size		Measured Size
(USA)		(mm)
	3	44.1
	3.5	45.4
	4	46.7
	4.5	48.0
	5	49.2
	5.5	50.5
	6	51.8
	6.5	53.1
	7	54.3
	7.5	55.6
	8	56.9
	8.5	58.2
	9	59.4
	9.5	60.7
	10	62.0

 
Here are some tips to make your ring size measurement more accurate:

	Don't measure cold fingers, as this is when fingers are their smallest.
	For the most accurate reading, measure the finger at the end of the day when the finger is the largest.